Protection Of Water Resources Research Articles

Research on the Accounting and Spatial Effects of Emergy Ecological Footprint and Industrial Green GDP--The Case of Yangtze River Economic Belt

The booming development of industrial enterprises at the cost of ecological resource consumption has inevitably harmed the ecological environment, especially since the phenomenon of water resource pollution is more serious. Exploring the relationship between the ecological environment and the industrial economy is crucial to the green and sustainable development of the region. This study uses the Spatial Durbin Model (SDM) to investigate the impact of emergy ecological footprint on the industrial green of gross domestic product (GDP) under the perspective of water resources, based on the panel data of 11 provinces in Chinas Yangtze River Economic Belt (YREB) from 2012 to 2021. The results show that first, the overall industrial green GDP of the YREB has increased year by year, and the effect of water resource protection is outstanding. Second, the emergy ecological footprint has a significant positive effect on industrial green GDP, and the spillover effect is also significant. Third, heterogeneity analysis shows that the spatial relationship between emergy ecological footprint and industrial green GDP is different in different regions, and the local effect and neighborhood effect of the high industrial green economic development areas are consistent with those of the YREB, while the relationship between the low industrial green economic development areas is not obvious. This paper is of great significance for the green development of industrial enterprises in the YREB and guides the formulation of sustainable development policies.

Prioritization of soil erosion-prone sub-watersheds using geomorphometric and statistical-based weighted sum priority approach in the middle Omo-Gibe River basin, Southern Ethiopia

ABSTRACT Soil erosion, a major factor contributing to land degradation, poses significant environmental challenges across sub-Saharan Africa, including Ethiopia. This study identifies erosion-prone sub-watersheds in southern Ethiopia's middle Omo-Gibe River basin using digital elevation model data, analyzed using a geomorphometric and statistically weighted sum priority approach in a Geographic Information System environment. Additionally, hypsometric analysis, lithology, land use/cover analysis, and field observations were integrated to enhance methodological reliability in assessing soil erosion patterns and subsequent land degradation in the basin. Results highlight sub-watersheds with varying degrees of erosion sensitivity, emphasizing morphometric parameters and landscape characteristics. Furthermore, hypsometric analysis confirms a moderate to high susceptibility of sub-watersheds to soil erosion. Moreover, half of the river basin consists of shrubland, encompassing scrubs, range lands, and small wooded areas. These are less efficient in mitigating erosion compared to forests, especially in the face of significant summer rainfall and ensuing runoff. Statistical prioritization identified 19 sub-watersheds, covering 43% of the basin's total area, as highly prone to soil erosion and land degradation. The study's findings are valuable for Ethiopian watershed management decision-makers, enabling informed resource allocation and targeted interventions to control soil erosion and protect water resources by utilizing the outputs of this study.

Legal terminology in environmental and land law: theoretical-legal analysis

The article examines the peculiarities of the formation of legal terminology in the field of environmental and land law and proves the feasibility of its improvement in connection with the adaptation of the norms of national law to the law of the European Union. The article states that today in Ukraine there is significant environmental pollution, climate change, land deterioration, which significantly worsened in connection with the military aggression of the Russian Federation and caused a particularly dangerous ecological situation in the country. The article proves that the implementation of the principles of the right of citizens to a safe environment, ensuring human safety, protection and rational use of land, forest, water and subsoil resources is not possible without a clear definition of legal prescriptions enshrined in the law. The article states that one of the important aspects of the language of law is legal terminology, which makes it possible to formulate the content of a legal document. The article defines the concepts of “terminology”, “terminology”, “legal terminology”. It is noted that it is not appropriate to equate the concepts of “terminology” and “terminological system”. It has been investigated that despite the presence of established terminology in environmental law, the presence of terms in need of improvement is observed in this field, namely: “ecological law” and “environmental law”. It has been proved that for the purpose of further codification of environmental law, it seems appropriate to use the term “environmental law” as an established term of EU legislation. It has been analyzed that today the language of the law in the field of land relations is gaining importance, which is due to the formation of the land market in Ukraine and the need to adapt the norms of land law to EU law. It is noted that in land law there is a problem of identifying the terms: “land”, “land plot”. It was noted that the legal terms related to the formation of the land market in Ukraine need improvement and detailing. It was concluded that legal terminology in the field of environmental and land law is one of the important aspects of the development of the language of law. The issue of improving legal terminology in the field of environmental and land law is one of the necessary steps that will contribute to the unification and harmonization of the legal norms of the specified fields in the context of adapting the norms of national law to EU law.

Ultimate water level and deformation failures of the artificial dam in the coal mine underground reservoir

Coal mine underground reservoirs provide a new choice for the protection and utilization of water resources. This paper takes the underground reservoir of Wulanmulun Mine as the background, and takes the MB-1# artificial dam in the goaf of 31104–31116 working face of 3–1 coal seam as the research object. The theoretical model of artificial dam is established by elastic–plastic two-way slab theory, and the theoretical mechanical analysis and calculation are carried out. A similitude physical model for the coal mine underground reservoir was built by using the self-developed nested dual-dynamic-pressure similitude simulation testing system. Later, the mechanical response and deformation failure features of the artificial dam under different water pressure values were analyzed and the ultimate water pressure was determined. In addition, FLAC3D was used to determine the stress-seepage field-coupling model for the artificial dam. Using this model, the influence of water pressure on the multi-load coupling effect of the artificial dam and coal pillar dam was characterized. The dam form is optimized and the safety water level evaluation method of the dam body is proposed. The research results are as follows: (1) Based on the theory of elastic–plastic two-way slab, the theoretical analysis model of artificial dam is established, the expression of the ultimate water level function of artificial dam is derived, and the theoretical ultimate water head is determined to be 18.2 m (2) The seepage law of underground reservoir under different water pressures is obtained, and the ultimate water pressure of the model is determined to be 11.43 kPa. (3) It is clarified that the failure modes of the artificial dam are seepage failure and mechanical failure, and it is revealed that the groove area is the weakest position where the dam is most vulnerable to failure. In view of the failure modes of the dam, the I-shaped structure artificial dam is proposed. (4) A safe water level assessment method is proposed for the constructed artificial dam. According to the analysis of on-site monitoring data of MB-1# dam, the actual water level in the reservoir is within the allowable water level range of the artificial dam, and the whole reservoir is in a stable and relatively safe state at present. The reliability of this assessment method has been verified.

Application of artificial wetland technology in Miyun Reservoir water management

In recent years, with the increasing attention to environmental pollution, water quality management has become an important part of protecting water resources and maintaining ecological balance. And as an important means of water pollution remediation, artificial wetlands have gradually received widespread attention. Miyun Reservoir, as an important drinking water source in Beijing, is particularly important for water quality management. As an ecological restoration technology, artificial wetland has significant water quality improvement effect by simulating and improving the function of natural wetland. Therefore, artificial wetland has important scientific research and practical significance in the water management of Miyun Reservoir. In this paper, we will discuss the application of artificial wetland in water management of Miyun Reservoir, and summarise the results and conclusions of the study, highlight the impact and significance of the study, and look forward to the future research direction. By exploring the application of artificial wetlands in reservoir water management, it is expected to provide scientific basis and technical support for water resource management departments and decision makers, and contribute to the improvement of water quality and ecological restoration of Miyun Reservoir.

Transboundary water resource management and sustainable development in the lancang-mekong river basin: an analysis of international water law

ABSTRACT The Lancang-Mekong River Basin stands as one of the most critical and complex transboundary basins globally, where the utilization and protection of water resources are paramount. This basin, linking China, Myanmar, Laos, Cambodia, Thailand, and Vietnam, is characterized by a dense population and rapid industrial and agricultural development, fostering frequent economic and cultural exchanges. Cooperative efforts in water resource utilization and protection among these countries lead to issues such as resource disputes, environmental pollution, and collaboration barriers. Since the six basin countries have not jointly joined any international convention on water resources development or protection, disputes have been resolved and cooperation promoted through existing inter-state cooperation mechanisms for many years. However, these mechanisms often fall short due to the lack of common guiding principles. Achieving sustainable water resource development in the Lancang-Mekong River Basin aligns with the national interests of the six countries. The basin states can establish a transboundary Environmental Impact Assessment system and a dispute settlement mechanism. Constructing a comprehensive Integrated Water Resource Management Cooperation Mechanism, rooted in the fundamental principles of international water law, is crucial for enhancing the level of international cooperation within the basin.

Use of water resources and sustainability with concepts, definitions and examples

Water is a vital resource for all living things (people, ecosystems, economic development, energy production, national security). Coordination and harmony in spatial and intersectoral planning and decision-making processes can be achieved through the rational and sustainable use of water resources. Protection and sustainable use of water resources is extremely important. Nowadays, problems such as drought and water pollution arise due to global warming and increasing environmental pollution. This situation reduces drinking water resources. Serious measures need to be taken worldwide to ensure the continuity of life protect water resources from drought and keep them clean. Techniques used to evaluate the potential of water resources, which have become increasingly important in recent years, and to create conscious use of water resources, require effective data systems. Currently used systems do not represent very large areas. For this reason, it is necessary to develop representative methods by integrating the data received from ground stations and the parameters of remote sensing techniques. Many extensions of the programs, which are widely used in the world and evaluated using Geographic Information System (GIS) supported Analytical Hierarchy Process (AHP) methods in database studies for the use of water resources, are extremely useful for basin modeling. The purpose of this study; It is a study on the potential of GIS-based multivariate statistics for evaluating the use and sustainability of water resources and the use of water stored in a geographical database.

Impacts of land use/land cover on water quality: a contemporary review for researchers and policymakers

Abstract Few factors are as important in determining water quality as land use/land cover (LULC). Many land use activities, including agriculture, urban development, mining, and commercial forestry, tend to be sources of diffuse pollution. By contrast, indigenous vegetation can act as a sink, thus providing some protection from diffuse anthropogenic contamination. Notwithstanding the large body of research demonstrating these facts, decision-makers require clear and accessible information to assist them in developing effective management plans that are fully cognisant of the manifold impacts of LULC on water resources. Reviewing the available literature, this article, therefore, offers a critical overview of the typical impacts of LULC on water quality. An important strategy for managing water quality highlighted in this article is the maintenance of a sufficient amount of unfragmented natural vegetation, not only within riparian zones but also across catchment areas. However, knowledge gaps identified in this review indicate that further context-specific research is required to determine not only the types and minimum amount of vegetative cover required to protect water resources from diffuse pollution but also the potential impact of landscape fragmentation on the ability of natural vegetation to protect water resources. A critical discussion of these factors is therefore provided.

A Study on the Driving Mechanisms of Water Supply and Demand Perception in the Digital Age

This study investigates the drivers of water supply and demand perception in the digital age, focusing on the impact of various factors including climate change awareness, socio-economic impact perception, environmental policy awareness, and water resource protection consciousness. Through questionnaire surveys conducted in Chengdu City and data analysis using the Partial Least Squares Structural Equation Modeling (PLS-SEM), this study reveals how the aforementioned factors collectively influence the perception of water supply and demand. The findings indicate that a profound understanding of climate change and socio-economic activities, along with a high awareness of environmental policies, can significantly enhance the public’s consciousness towards water resource protection, thereby affecting the accurate perception of water supply and demand conditions. This study not only offers a new perspective in the field of water resource management but also provides a theoretical basis and data support for formulating effective water resource protection strategies, emphasizing the critical role of intelligent water resource management in addressing climate change and promoting sustainable development. The limitations of the study include the restricted sample size and scope, which may affect the generalizability of the results. Future research is recommended to consider more variables, such as regional cultural and economic differences, and to conduct validations across a broader area and population.

Understanding Water Governance in the Central Rift Valley of Ethiopia: Governance Framework, Coherence and Practices.

Water governance demands multi-sector participation beyond the state; and, appropriate laws, policies, regulations, and institutions need to be developed and put in place for sustainable use of water resources. A good water policy, a critical and integral instrument of water governance, guides water use schemes and ensures equitable water distribution among users. The Ethiopian Central Rift Valley (CRV) is rich in water resources, but these water resources are currently under severe strain owing to an imbalance in human-water interactions. This study examined the state of water resources governance framework, policy coherence, actors' engagement and transparency, accountability, and participation in irrigation water supply in the CRV of Ethiopia. Key informant interviews (KII), focused group discussions, and document reviews were used to gather data for the study. The NVivo 11 program was used to organize, code, and analyze the data. The results revealed that water resources governance practices such as water allocation and apportionment, water resources protection, and conservation activities were inappropriately exercised. Water resources management policy mechanisms were not fully put in place. Lack of coherence in water policy implementation, absence of clear roles and responsibilities of stakeholders, absence of transparency and accountability in irrigation water service delivery, and lack of meaningful participation of key actors in water governance decision-making were observed. As a result, over-abstraction, deterioration of buffer zone areas, and chemical erosion from surrounding farming are attributed to the reduction in water volume and quality in the CRV. These challenges have influenced aquatic ecosystem services and threaten the livelihoods of the surrounding communities. Hence, reforms relating to policy coherence and enforcement, stakeholder engagement, water distribution strategies, and the implementation of water governance principles must be given adequate emphasis.

Comprehensive evaluation and analysis of water resource characteristics in Lixiahe Plain, China

ABSTRACT Lixiahe Plain's local water resources need to be evaluated effectively and comprehensively. This study is based on the multisource data from 60 natural water samples, 16 rainfall monitoring stations, and 2 evaporation monitoring stations from 1965 to 2020. Synchronous series representativeness analysis, water quality analysis, and water resource availability estimation are conducted to analyze the spatiotemporal distribution characteristics of rainfall, evaporation, and water quality and calculate the availability of various types of water resources. The results indicate that the spatiotemporal distribution of rainfall and evapotranspiration in the study area is uneven, which increases the threat of local floods and droughts. The quality of the main rivers and lakes in the region is good, and the water quality of the drinking water source area and groundwater reaches and even exceeds Class III water standards. In the year 2020, the total water usage in the research area reached 341 million m3. However, the available sum of surface water resources and transit water availability in 2022 was only 201 million m3, so local water supply needs cannot be easily met. Exploring the water resource characterization model of the Lower Rivers Plain can help in local water resource management and protection.

A Feature Selection Method Based on Relief Feature Ranking with Recursive Feature Elimination for the Inversion of Urban River Water Quality Parameters Using Multispectral Imagery from an Unmanned Aerial Vehicle

The timely monitoring of urban water bodies using unmanned aerial vehicle (UAV)-mounted remote sensing technology is crucial for urban water resource protection and management. Addressing the limitations of the use of satellite data in inferring the water quality parameters of small-scale water bodies due to their spatial resolution constraints and limited input features, this study focuses on the Zao River in Xi’an City. Leveraging UAV multispectral imagery, a feature selection method based on Relief Feature Ranking with Recursive Feature Elimination (Relief F-RFE) is proposed to determine the quality parameters of the typical urban pollution in water (dissolved oxygen (DO), total nitrogen (TN), turbidity, and chemical oxygen demand (COD). By constructing a potential feature set and utilizing optimal feature combinations, inversion models are developed for the four water quality parameters using three machine learning (ML) algorithms (Random Forest (RF), Support Vector Regression (SVR), Light Gradient Boosting Machine (LightGBM). The inversion accuracies of the different models are compared, and the spatial distribution of the four water quality parameters is analyzed. The results show that the models constructed based on UAV-based multispectral remote sensing imagery perform well in inferring the water quality parameters of the Zao River. The SVR algorithm, based on Relief F-RFE feature selection, achieves a higher accuracy, with RMSE values of 7.19 mg/L, 1.14 mg/L, 3.15 NTU, and 4.28 mg/L, respectively. The methods and conclusions of this study serve as a reference for research on the inversion of water quality parameters in urban rivers.

Physicochemical characterization of university campus’ wastewater for internal treatment system installation (Casablanca, Morocco)

Today, protecting water resources and their sustainable use has become an obligation of people and organizations. Wastewater management and reclamation are the most important solutions to protect these resources. This study aims to determine the wastewater physicochemical quality of the Faculty of Sciences Ben M'Sick (FSBM) (Casablanca, Morocco) to establish the appropriate system for their treatment and internal reclamation. The results show that averages of FSBM's wastewater temperature vary between 17.64 and 19.55 °C, 7.18 and 8.18 for pH, and 2.47 and 3.98 mS.cm-1 for electrical conductivity.. The COD, BOD5, and TSS average values oscillate respectively between 967.44-1,151.08 mg.L-1, 70.5-119.05 mg.L-1, and 223.64-1,659.74 mg.L-1, and those of total phosphorus between 2 and 3.99 mg.L-1. The determination of the biodegradability degree of the discharge, through the calculation of COD/BOD5, BOD5/COD, TSS/BOD5, COD/TP, COD/NH4+ ratios, and oxidizable matters (OM,) reveals that the FSBM's wastewater has a heterogeneous character with a high load of oxidizable matter difficult to biodegrade. Despite its low biodegradability, the FSBM’s wastewater could be treated using a biological treatment system, preceded by a physicochemical treatment to eliminate non-biodegradable chemical substances. Such a choice of wastewater treatment system requires prior experimental investigations and laboratory tests.

Promoting Effective Refugee Protection in India: Balancing National Interests and International Obligations

In the background of the climate change, we estimate that one of the problems that humanity is to face in the near future concerns natural resources. In our view, water is one of the resources that will become increasingly important in the coming years by being on the way to diminishing. Force majeure events such as the vegetation fires or floods in the summer of 2023 show us that people and nature must be friends. Given that drinking water is vital for human existence, we believe that the proposed topic is of general interest and should be of concern not only to public authorities, but to the entire scientific community and to individuals, which makes it topical and important. The scope of the study is to analyse the issue of water, which means that, on the one hand, we will investigate the national regulatory framework but also comparative law to know how the legislator relates to water and, on the other hand, we will capture the current international trends in this field. By using research methods specific to law, we will underline the conclusion of our paperwork, that the protection of water resources is the responsibility of all of us: individuals, authorities, states, taking into consideration present and future generations. Keywords: public authorities; water; public good; Administrative Code; case-law.

3D printing of a photo-curable hydrogel to engineer mechanically robust porous structure for ion capture or sustained potassium ferrate(VI) release for water treatment

Contaminated water and scarcity of clean water are becoming progressively serious environmental concerns. Removal of hazardous pollutants from wastewater is vital and urgently needed attention for the protection of pure water resources. To tackle the aforementioned challenges, macroporous structures have great potential to be used in the treatment of heavy metal ions to improve the adsorption efficiency and sustainability of wastewater treatment methodologies. In this context, additive manufacturing technologies have gained considerable attention because of their ability to construct intricate macroporous shapes with multifunctionalities using diverse materials. Here, we used a photocrosslinking graft copolymerization of polyvinyl alcohol/acrylic acid-based ink using UV irradiation in the presence of Norrish type II photosensitizer through a hot-melt extrusion-type 3D printer to improve the printing quality of crosslinked ink. The photocured inks offered strong shear-thinning behavior that allowed layer-by-layer deposition to generate well-defined 3D structures, while having sufficiently high viscoelasticity to retain the shape after printing process. With an adequate viscosity at the higher extrusion shearing forces, the 3D printed structures could create multifaceted self-supporting scaffolds with an internal lattice structure that possesses high level of porosity. The hierarchically porous structure of 3D objects showed a recoverable structure yet robust matrix, offering more specific surface area, capable of effectively removing heavy metal ions from water with fast-responsiveness and a high capacity. The ferrate(VI)-contained 3D capsule-like object was also detected to be efficient regarding chemical oxygen demand reduction and decolorization of real wastewater. Such 3D-printed hierarchical macroporous objects can offer great prospects in the treatment of water and wastewater purification applications.

Analisis Potensi dan Kemajuan dalam Pengelolaan Air Bersih dan Sanitasi Berkelanjutan (SDGs 6) di Indonesia

The aim of this research is to provide an analysis of how efforts have been made to achieve Sustainable Development Goal number six (SDGs 6), namely Clean Water and Sanitation. The main focus of this research is to assess the implementation of policies and projects related to water and sanitation and understand the impact they will have on society and the environment. This study collects data from government reports and other relevant research. Universal access to clean drinking water, adequate sanitation, efficient water use, and protection of water ecosystems are the main indicators of SDGs 6. The research results show great progress in achieving SDGs 6 in several aspects. Access to clean water has increased and many sanitation projects have been implemented successfully. Challenges remain, especially in achieving sanitation goals in rural areas and in managing water quality. Integrated water resource management and protection of water ecosystems are highlighted in this analysis. The research also underscores the need for international cooperation and community participation in addressing clean water and sanitation challenges. Data limitations and unequal access continue to be important issues that need to be addressed. Therefore, this study recommends increased detailed data collection and capacity building of local communities. By detailing the challenges and potential solutions, this research contributes to a deeper understanding of achieving SDGs 6. The implications of these findings can help civil society in designing more effective policies and projects to achieve clean water and sustainable sanitation.

Wetland Conservation Legislations: Global processes and China’s practices

Abstract Natural wetland areas in China have experienced a continuous decline over the past two decades, which is partly due to the lack of comprehensive wetland protection laws and regulations. Despite investing over 4.24 billion USD in wetland conservation and restoration since 2000, the deterioration of wetlands persists. This study reviews the development of global wetland protection laws and regulations, analyzes the progress of wetland legislation in China, and explores the impact of economic development levels on wetland protection legislation, while also providing an in-depth interpretation of the core elements of the "Wetland Protection Law of the People's Republic of China." The results indicate that since the late 1940s, wetland protection laws and regulations have begun to emerge, with most developed countries gradually implementing related policies between the 1980s and 1990s; about 71% of wetland protection laws are concentrated in 29 countries, while 69 countries still lack specific wetland protection laws. An analysis of 962 global documents reveals that wetland protection legislation mainly focuses on the protection of water resources, species, and ecosystems. China's wetland legislation started late, with the "Wetland Protection Law of the People's Republic of China" being officially implemented only in June 2022. Furthermore, the study points out that economic development plays a crucial role in wetland legislation worldwide. Lastly, the article summarizes the key features of the "Wetland Protection Law of the People's Republic of China," including the improvement of the environmental protection legislative system, increased penalties for illegal occupation of wetlands, clearer protection goals, and the assurance of the integrity and connectivity of wetland ecosystems through stringent policies.

Study on enhancing groundwater quality in a coastal area of Saudi Arabia using a curved glass solar still

Due to the complex geological factors and their causes, it is essential to realize the saltiness and pollution of the groundwater in the arid shoreline aquifer. The intrusion of seawater into coastline aquifers is an increasingly significant issue due to urbanization, the exploitation of groundwater, and the global rise in temperature. The increasing salt concentration of groundwater in shoreline aquifers has emerged as a significant social and economic problem in Saudi Arabia. Consequently, groundwater alkalinity levels must be accurately determined to ensure the effective protection and preservation of water resources. A compilation of eight water samples was collected along the south-western coast of Saudi Arabia, and a comprehensive evaluation of the groundwater quality was conducted using a combination of indicators. The findings indicated that the intrusion of saltwater caused a significant increase in the salt concentration and damage to the groundwater quality near the coastline. In this work, a curved glass solar still (CGSS) has been deployed to process the groundwater, and the performance of the CGSS in improving the groundwater quality was assessed under clear sky conditions. The findings indicate that the desalination process executed using the CGSS resulted in a more substantial improvement in groundwater quality, with an average daily yield of 3513 ml/day achieved with the CGSS.

On the of seawater desalination environmental impacts and brine treatment based challenges and mitigation measures in Algeria

In this paper the environmental impacts of seawater desalination is investigated and highlighted. Indeed despite the various benefits of desalination there is growing apprehension about the potential negative environmental effects it may bring and generate. Both during the plant construction and its operation service. There is the possibility of leading and causing adverse environmental impacts. A significant concern with desalination is the co-produced and generated waste known as 'brine' or 'reject,' which contains high salinity as well as chemical residuals which are released into the marine environment. Viable and cost-effective brine management systems are necessary to mitigate the negative impact of brine, also referred to as concentrate, which is a by-product of the desalination process. This high salinity substance poses a threat to the environment and must be managed effectively in order to reduce pollution. Aside from brine other difficulties include marine species entrainment and trapping, as well as high chemical use. This paper provides an extensive overview and evaluation of desalination technologies used in Algeria including thermal methods such as Multi-Stage Flash (MSF) and Multiple Effect Distillation (MED) as well as Membrane Reverse Osmosis (RO). Furthermore in order to assess the potential environmental implications of desalination and brine treatment on the Algerian coast, mitigation strategies are proposed to curb the environmental negative impact. To protect water resources for present and future generations, improved brine management techniques are needed to minimize adverse environmental effects and lower the financial burden of disposal. This will encourage further advancements in desalination plants. Ultimately, the paper emphasizes upcoming research opportunities in brine treatment technologies with a focus on improving the efficiency and sustainability of desalination.

Ce-UiO-66-F4-based composites decorated with green carbon dots for universal adsorption of organic pollutants containing hydrogen bond donors and its application exploration

Efficient and stable water purification is essential for the protection of water resources. Current adsorbents based on metal–organic frameworks face limitations of restricted active sites and single adsorption objects. In this study, we developed a cost-effective and environmentally friendly Tea-L-CDs@Ce-UiO-66-F4 composites by growing Tea and L-tryptophan carbon dots (Tea-L-CDs) over Ce-UiO-66-F4 MOF, and the interaction force was enhanced by hydrogen bonding (-F/O/N…H-O-, -F/O/N…H-N-, etc.) to achieve universal adsorption. In detail, the maximum adsorption capacity (qm) of the adsorbent for trypan blue (TB), congo red (CR), and CR (adjust pH) was 773.4, 1428.6, and 4761.9 mg/g. The universal experiment showed that the composites exhibited excellent qm for alizarin red S (ARS, 662.7 mg/g) and rhodamine B (RdB, 374.0 mg/g). Meanwhile, Tea-L-CDs@Ce-UiO-66-F4 composites maintained good anti-interference ability (salt solution, temperature, etc.). Remarkably, the adsorption capacity of the adsorbent for dyes exceeded 97 % of qm within 1 min of contact time. The adsorption performance of synthetic material for TB, CR, ARS, and RdB is better than most of the adsorbents, especially the qm for TB is higher than any adsorbent previously reported. Besides, this adsorbent had excellent storage stability in the air for 30 days. Based on this nanomaterial, we successfully developed an automated dye filtration and contamination assessment system for blocking dye-attached adsorbent and online detection of dye residues after water purification. Thus, the synthesized Tea-L-CDs@Ce-UiO-66-F4 composites, with universal adsorption, high efficiency, and good storage stability, hold great potential for wastewater purification.