Paint Industry Research Articles

Microencapsulated carotenoids from orange sweet potato: Degradation kinetics and physicochemical properties

AbstractThe use of natural pigments in the food industry has increased due to their health benefits. Carotenoids are natural pigments that carry the disadvantage of sensitivity to temperature, light and the presence of enzymes and oxygen. Microencapsulation technology is widely used to protect these compounds against degradation, preserving their physicochemical characteristics. The research objective was to obtain the kinetics of carotenoid degradation of a microencapsulated extract of orange‐fleshed sweet potato (Ipomoea batatas L.) and to establish its physicochemical properties. The sweet potato extract was obtained using ultrasound and then microencapsulated by spray drying using maltodextrin as the wall material. The microencapsulate obtained was subjected to degradation kinetics at 30, 40 and 50°C. Carotenoid quantification analysis, colour, rehydration properties, antioxidant capacity, Fourier‐transform infrared (FTIR) and RAMAN spectroscopy and microstructural characterisation were performed on the microencapsulated carotenoids. From the kinetic analysis, the activation energy of the sweet potato extract was 16.31 kJ/mol while that of the microencapsulated sweet potato extract was 10.27 kJ/mol. Thus, it can be concluded that the microencapsulation process improved the stability of carotenoids subjected to thermal conditions. FTIR and RAMAN spectra confirmed the microencapsulation of the carotenoids. The microencapsulated powder showed a hygroscopicity of 0.22 g/100 g, wettability of 49 s and high solubility. The results obtained in the kinetics are a useful tool to predict losses during the process of heating the carotenoids from sweet potato, thus allowing improvement and selection of the products to which this powder can be applied, in either thermal or cold processes.

Current Progress in Visible Light-induced Synthesis and Functionalization of N- and S-Heterocycles: A Sustainable Perspective

Heterocycles are of much importance as the majority of the existing drugs contain one or more heterocyclic units in their structures. Among all the heterocycles, nitrogen, and sulphurcontaining ones occupy major space, and they have special properties which make them suitable for the textile, cosmetic, and paint industries other than pharmaceutical. Recently, visible light has emerged as a powerful tool for performing various reactions at ambient temperatures and mild conditions and thus it has been used for the key step in the synthesis of many molecules. In addition, visible light assisted methods are usually cost and time effective. Thus, this review highlighted the recent developments in visible light induced methods for the synthesis of some selected biologically active N- and S- containing heterocycles such as benzothiazoles, indoles and triazoles and their functionalization. The advantages, green aspects and limitations of these methods have also been discussed.

ZrO2 nanoparticle embedded reusable and self-standing biopolymeric membrane for efficient piezodynamic eradication of gram-positive and gram-negative coliform bacteria

Bacterial infections pose a significant global threat, especially with the increasing prevalence of antibiotic resistance and multidrug resistance (MDR). To address this challenge, dynamic antibacterial therapies are becoming increasingly important, with piezodynamic therapy emerging as a particularly promising approach due to its non-invasive nature and quick response using mechanical stimuli to target bacterial contaminations. This study, probably for the first-time, introduced an advanced piezo-active membrane, ZrO2 nanoparticle-loaded chitosan biopolymer (ZO@CHS), which utilized piezodynamic therapy to combat both Gram-positive (E. faecalis) and Gram-negative (E. coli) coliform bacteria. By combining the biocompatibility of chitosan with the enhanced physiochemical properties of ZrO2, this self-supporting and non-toxic highly polarized bio-nanocomposite (ZO@CHS) membrane generated a significant piezo-voltage of 4.47 V upon finger tapping and promoted cellular adhesion while enhancing reactive radicals’ production under mild ultrasound (∼15 kHz), eliminating over 96 % of E. coli and 97 % E. faecalis within just 20 minutes, which corroborated well with the statistical analysis. Detailed study, including reactive oxygen species (ROS) assessment through Photoluminescence spectroscopy and bacterial FESEM examination, provided insights into the underlying mechanism. Additionally, the membrane’s robust structure and hydrophobic properties allow for cyclic reuse, retaining over 95 % effectiveness after five cycles. Furthermore, the superior biocompatibility of the membrane, evidenced by a minimal haemolysis rate of 0.11 %, making it suitable for potential in vivo applications. Thus, this novel membrane presented promising applications in healthcare systems and pigment industries, serving as a self-cleaning material.

A Novel Model for Sustainable Supplier Selection in the Paint and Coating Industry

Given the significance of sustainability in the current global market, doing a comprehensive and current assessment of a supplier’s sustainability might be beneficial for improving a firm’s competitiveness. This study aims to develop sustainable supplier selection criteria, examine their interrelationships, and determine the critical criteria in the paint and coating industry. This study employed a focus group discussion (FGD), the Delphi method, a decision-making trial and evaluation laboratory-based analytical network process (DANP), and a measurement of alternatives and ranking according to compromise solution (MARCOS). The findings indicated that most sub−criteriasub−criteriaexperts agreed that 11 economic sub−criteria, five environmental sub−criteria, and three social sub−criteria should be considered when selecting a sustainable supplier. The results show that the most influential criteria are environmental criteria, while the critical criteria are social criteria. In addition, “Service” (E4), “Green Material” (L3), and “Health and Safety” (S1) sub−criteria should be considered to assess the supplier because they have high relation and prominence. Globally, the top five highest weighted sub−criteria are “Respect for the Law” (S2), “Health and Safety” (S1), “Worker’s Social Rights” (S3), “Waste Management” (L5), and “Environment Management System” (L1). We practically selected 12 providers from the paint and coating sector to assess the scheme’s practicality. This work introduced a novel model for selecting a sustainable supplier that helps industries understand their core criteria and sub−criteria. This will enhance the industry’s competitiveness and sustainability by evaluating suppliers based on economic, environmental, and social criteria.

Evaluation of contaminated groundwater for excessive heavy metal presence and its further assessment of the potential risk to public health.

Water plays a significant role in human life. However, the contamination of groundwater by heavy metals (HMs) has profound implications for public health. Industrialization, urbanization, and agricultural activities are turning out to be major causes for the increasing concentration of HMs in rapidly industrializing areas like Rohtak district, Haryana, India. The current study aimed at evaluating and predicting the health hazards associated with the radical rise of HMs in the groundwater of Rohtak district. For this purpose, 45 seasonal-based groundwater samples were collected from five blocks in Rohtak district, namely Kalanaur, Meham, Lakhan Majra, Rohtak City, and Sampla, both during pre- and post-monsoon seasons. Besides physicochemical analysis, these groundwater samples were analyzed for the contamination of HMs. The findings revealed that groundwater samples were relatively more contaminated during the post-monsoon period rather than pre-monsoon. The water quality index (WQI), devised to classify water quality into specific classes, depicted the Kalanaur region as "very poor." Another index named the HM pollution index (HPI) denoted the levels of HMs and categorized Kalanaur as most deteriorated, followed by Meham, Lakhan Majra, Sampla, and Rohtak City. Additionally, principal component analysis (PCA) was employed that showed a significant variation in the distribution pattern of HMs, with the major load being attributed to PC1 and PC2 for both seasons. Pearson's correlation analysis indicated a significant association of pH (R2 = 0.917) with HMs (specifically for Cd and Cr). In terms of health risk assessment, carcinogenic human health risk due to Pb and Cr was found to be higher in children than adults. Non-carcinogenic risk, indicative of harmful human health effects, apart from cancer, was calculated in terms of hazard quotient (HQ) and hazard index (HI). Results of the same, designated "children" as a vulnerable category compared with "adults," especially in the Kalanaur, Sampla, and Rohtak City blocks of the study area. The results thus reiterated that Kalanaur is the most contaminated block among the five blocks chosen and should be given urgent attention. The study holds importance as it provides a framework regarding the methodology that should be adapted for the evaluation, management, and protection of groundwater at a regional level, which could further be replicated by environmentalists and hydrogeologists across the world. PRACTITIONER POINTS: Water logging is one of the most common problems in Kalanaur block of Rohtak district, responsible for causing groundwater pollution. Cadmium and lead pollution was prevalent in Rohtak due to electroplating industries, paint industry, automobile sector, and industrial discharge. Bioremediation is one of the suitable techniques that can be used for the treatment of groundwater that involves the use of microorganisms. Efficient use of groundwater resources is necessary for sustainable development.

Determination of antibacterial performance of boric acid ester in the paint industry

ABSTRACT This study aims to assess the antibacterial activity of boric acid ester derived from boron mines, which is utilised as an active component in the paint industry. Multiple product variations were obtained by adding boric acid ester to the base, referred to as the reference sample, known as silk matte paint, and used as an interior paint with active substance concentrations ranging from 0.005% to 0.6%. Escherichia coli (ATCC10536) bacteria were inoculated at 78000 cfu cm−2 into samples with 0.005- 0.075% active substance, and at 24000 cfu cm−2 into samples containing 0.15- 0.6% of the active substance, and the reduction rates were determined by a mathematical equation via multivariate linear regression analysis, relating Escherichia coli reduction percentages, surface energy values, and pH measurements, including the power percentages and gloss values for the reference sample. The highest level of antibacterial effect was observed in the sample containing 0.075% active substance.

Enhancing cauliflower growth under cadmium stress: synergistic effects of Cd-tolerant Klebsiella strains and jasmonic acid foliar application.

The pollution of heavy metals (HMs) is a major environmental concern for agricultural farming communities due to water scarcity, which forces farmers to use wastewater for irrigation purposes in Pakistan. Vegetables grown around the cities are irrigated with domestic and industrial wastewater from areas near mining, paint, and ceramic industries that pollute edible parts of crops with various HMs. Cadmium (Cd) is an extremely toxic metal in arable soil that enters the food chain and damages the native biota, ultimately causing a reduction in plant growth and development. However, the use of microbes and growth regulators enhances plant growth and development as well as HM immobilization into the cell wall and hinders their entry into the food chain. Thus, the integrated use of bacterial consortium along with exogenously applied jasmonic acid (JA) mitigates the adverse effect of metal stress, ultimately reducing the metal mobility into roots by soil. Therefore, the current study was conducted to check the impact of Cd-tolerant bacteria and JA on the growth, nutrient status, and uptake of Cd in the cauliflower (Brassica oleracea). Our results demonstrated that increasing concentrations of Cd negatively affect growth, physiological, and biochemical attributes, while the use of a bacterial consortium (SS7 + SS8) with JA (40 μmol L-1) significantly improved chlorophyll contents, stem fresh and dry biomass (19.7, 12.7, and 17.3%), root length and root fresh and dry weights (28.8, 15.2, and 23.0%), and curd fresh and dry weights and curd diameter (18.7, 12.6, and 15.1%). However, the maximum reduction in soil Cd, roots, and curd uptake was observed by 8, 11, and 9.3%, respectively, under integrated treatment as compared to the control. Moreover, integrating bacterial consortium and JA improves superoxide dismutase (SOD) (16.79%), peroxidase dismutase (POD) (26.96%), peroxidase (POX) (26.13%), and catalase (CAT) (26.86%). The plant nitrogen, phosphorus, and potassium contents were significantly increased in soil, roots, and curd up to 8, 11, and 9.3%, respectively. Hence, a consortium of Klebsiella strains in combination with JA is a potential phytostabilizer and it reduces the uptake of Cd from soil to roots to alleviate the adverse impact on cauliflower's growth and productivity.

Mutation Breeding of Monascus to Produce a High Yield of Orange Pigment and Low Citrinin Content Using the ARTP Method.

Monascus is a filamentous fungus with a long history of application in China, which can produce a variety of secondary metabolites, including Monascus red pigments, Monascus orange pigments, Monascus yellow pigments, and citrinin. There is widespread attention being paid to natural pigments because of their safety. Among the many natural pigments, orange pigment has a wide range of applications because of its unique color, but current production levels in the orange pigment industry are limited to a certain extent due to the insufficiently wide range of sources and low production. In this study, the ARTP mutation was used to obtain a strain with high-yield orange pigment and low citrinin. The strain RS7 was obtained through two-step mutagenesis, and all three pigments were improved to different degrees. The color value of orange pigment was elevated from the original 108 U/mL to 180 U/mL, an increase of 66.7% compared to the original strain, and the citrinin content was reduced by 69%. The result of microscopic morphology showed that RS7 has more wrinkles and is more convex than the R1 strain, but there was little change between the two strains. Therefore, the ARTP mutation influenced the growth and the biosynthesis of pigments in Monascus. In addition, the conditions of ultrasonic extraction of Monascus pigments were optimized using the response surface, and the separation of pigments was achieved with the method of thin-layer chromatography. Pigment stability results showed that the temperature had no significant effect on orange pigment, while tea polyphenol could improve its stability. This study generated a strain with high-yielding orange pigment and could lay a foundation for the future application of Monascus orange pigment in the food industry.

Comprehensive characterization of protease inhibiting gene family, cis-regulatory elements, and protein interaction network in linseed and their expression upon bud fly infestation

Linseed, also known as flax is an important oilseed crop with many potential uses in paint, textile, food and pharmaceutical industries. Susceptibility to bud fly (Dasyneura lini Barnes) infestation is a serious biotic concern leading to severe yield penalty in linseed. Protease inhibitors (PIs) are potential candidates that activate during the insect-pest attack and modulate the resistance. In the present study, we explored the PI candidates in the linseed genome and a total of 100 LuPI genes were identified and grouped into five distinct subgroups. The analysis of cis-acting elements revealed that almost all LuPI promoters contain several regulatory elementary related to growth and development, hormonal regulation and stress responses. Across the subfamilies of PIs, the specific domains are consistently found conserved in all protein sequences. The tissue-specific in-silico expression pattern via RNA-seq revealed that all the genes were regulated during different stress. The expression through qRT-PCR of 15 genes revealed the significant up-regulation of LuPI-24, LuPI-40, LuPI-49, LuPI-53, and LuPI-63 upon bud fly infestation in resistant genotype EC0099001 and resistant check variety Neela. This study establishes a foundation resource for comprehending the structural, functional, and evolutionary dimensions of protease inhibitors in linseed.

Laminar flow with temperature-dependent fluid properties between two stretching rectangular surfaces

Abstract The Navier–Stokes equations and the energy equation are used to investigate a fluid flow between two stretching rectangular surfaces subjected to a temperature difference that affects the dynamic viscosity and thermal conductivity of the fluid. The wall stretching process enhances the momentum boundary layer thickness which slows the axial motion of the fluid away from the flow boundaries. When the stretching parameter γ is equal to 1, that is the case corresponding to symmetric stretching, the minimum of the axial velocity is located at the midplane of the channel y = 0.5 if the viscosity variational parameter α equals 0. This minimum moves towards the region 0.5 < y < 1 for α > 0, but migrates towards the region 0 < y < 0.5 for α < 0. Moreover, in the case of symmetric stretching corresponding to γ = 1, the growth in Reynolds number Re tends to increase the axial velocity around the middle of the channel for α ≥ 0 in the attempt to counteract the effects of enhancing the momentum boundary layer thickness leading to the flattening of axial velocity profiles for Re ≥ 100. While the conductivity variational parameter β does not influence enough the fluid dynamics and heat transfer, the Reynolds number Re and the Péclet number Pé can increase or decrease the temperature distribution inside the channel depending on the sign of the parameter α. Practical applications related to the present study include lubrification, food manufacturing, paint industries, extrusion processes in plastic and metal industries.

Pigments from pathogenic bacteria: a comprehensive update on recent advances.

Bacterial pigments stand out as exceptional natural bioactive compounds with versatile functionalities. The pigments represent molecules from distinct chemical categories including terpenes, terpenoids, carotenoids, pyridine, pyrrole, indole, and phenazines, which are synthesized by diverse groups of bacteria. Their spectrum of physiological activities encompasses bioactive potentials that often confer fitness advantages to facilitate the survival of bacteria amid challenging environmental conditions. A large proportion of such pigments are produced by bacterial pathogens mostly as secondary metabolites. Their multifaceted properties augment potential applications in biomedical, food, pharmaceutical, textile, paint industries, bioremediation, and in biosensor development. Apart from possessing a less detrimental impact on health with environmentally beneficial attributes, tractable and scalable production strategies render bacterial pigments a sustainable option for novel biotechnological exploration for untapped discoveries. The review offers a comprehensive account of physiological role of pigments from bacterial pathogens, production strategies, and potential applications in various biomedical and biotechnological fields. Alongside, the prospect of combining bacterial pigment research with cutting-edge approaches like nanotechnology has been discussed to highlight future endeavours.

A comprehensive scenario of heavy metals pollution in the rivers of Bangladesh during the last two decades.

For decades, rivers have been used for transporting pollutants loaded with heavy metals (HMs) causing severe pollution in downstream.The current study aimed to review the levels and sources of 10 HMs, viz. As, Pb, Cd, Cr, Fe, Mn, Cu, Co, Ni, and Zn in the surface water of the rivers in Bangladesh. The PRISMA criteria were used to conduct a systematic review of the available literature published between 2001 and 2020, and thus a total of 55 documents were finally selected for review. The mean concentration of each HM exceeding the threshold limits as per World Health Organization (WHO), the United States Environmental Protection Agency (USEPA), and Department of Environment (DoE), Bangladesh standards were higher in the last decade (2011-2020) than in the previous one (2001-2010). Most HM concentrations in water were found above the threshold limits in three divisions (Dhaka, Rajshahi, and Chattogram). The Buriganga River in Dhaka has been the top polluted river in Bangladesh. Among the 10 HMs, six metals (As, Pb, Cd, Cr, Fe, and Mn) exceeded the limit set by WHO, USEPA, and DoE in all three seasons, where mean values of most of the HMs were found to be the highest in the summer season. Statistical analyses identified possible sources of HMs such as natural weathering, electroplating, fertilizers and pesticides, mining and manufacturing, textiles, coal mining and burning, batteries, and paint industries. Strong legislations and regulations, awareness programs, continuous monitoring, and comprehensive research are urgently needed to control riverine HMs pollutionin Bangladesh.

Advances in Color Chemistry and their Impact on the Paint Industry

Advances in Color Chemistry and their Impact on the Paint Industry

Indoor paint life cycle particle release: Safer-by-design products and the importance of choosing the right formula

In 2020, the European Commission published a regulation that states all producers of white paints containing titanium dioxide (TiO2) must provide a warning label on their products. Exposure during the production and application of products containing TiO2 can be harmful, and therefore these products must be labeled as “may cause cancer.” The paint industry is a major user of TiO2 pigment. This study focuses on pigment release from three TiO2-based paints and discusses the effect of paint formulation, more precisely the Pigment Volume Concentration (PVC), to predict TiO2 pigment release from the paints during a simulated use phase and at the end of life (EoL). The use phase considered mild abrasion of painted panels that simulated cleaning or touching. The EoL phase was studied using leaching tests simulating landfill disposal. TiO2 release during both activities was evident with a high discrepancy between the three paints. While dry rubbing was similar for all paints, activities involving water present a high release link to paint matrix degradation. The paint pigment volume concentration and the paint permeability determines the TiO2 release during wet rubbing and leaching. This work represents an attempt to identify the paint permeability as a matrix-related parameter to predict TiO2 release and a way to use of this parameter to develop safer products.

Environmentally Friendly o-Cresol-Furfural-Formaldehyde Resin as an Alternative to Traditional Phenol-Formaldehyde Resins for Paint Industry.

This paper describes studies on the preparation of an o-cresol-furfural-formaldehyde resin in the presence of an alkaline catalyst and its modification with n-butanol or 2-ethylhexanol. The novelty of this research is to obtain a furfural-based resin of the resole type and its etherification. Such resins are not described in the literature and also are not available on the market. The obtained resin based on furfural, which can be obtained from agricultural waste, had a low minimum content of free o-cresol < 1 wt.%, furfural < 0.1 wt.%, and formaldehyde < 0.1 wt.%. The resin structure was characterized by mass spectrometry (ESI-MS), FT-IR, and NMR spectroscopy, which showed the presence of hydroxymethylene groups in the resin before modification and alkyl groups derived from n-butanol and 2-ethylhexanol after modification. The etherified resins had a lower viscosity and were more flexible (DSC) than the resin before modification and they can be used as an environmentally friendly, safe, and sustainable alternative to traditional phenol-formaldehyde resins in the paint industry. They demonstrate the ability to create a protective coating with good adherence to metal substrates and an excellent balance of flexibility and hardness.

Removal of heavy metals from industrial paint effluent using coconut shell-derived activated carbon

This study evaluated the adsorption of heavy metals from paint industry effluent onto activated carbon produced from Coconut shells. The paint effluent samples were characterized before and after treatment via Atomic Absorption Spectroscopy (AAS) to identify the heavy metal ions present in the samples. The adsorption efficiency of the activated carbon and the effect of varying adsorbent particle size, impregnation ratio, and contact time were determined. The activated carbon from coconut shells was characterized via Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) to determine the surface morphology and surface-active functional group. The SEM revealed development in pore size after adding a chemical activator to create functional adsorption sites. The finding concluded that the smaller particle size of adsorbents, higher surface area, higher contact time, and higher impregnation ratio increase the efficiency of the adsorption process.

Optimization of spray drying process of buriti oil-loaded bilayer emulsions

Buriti oil is extracted from the fruits of a palm tree (Mauritia flexuosa L.) native to the Amazon rainforest, having one of the highest levels of β-carotene found in nature. The emulsification of buriti oil contributes to protecting the bioavailability of its bioactive compounds during processing. Drying oil-loaded emulsions is a way to produce microcapsules that have higher storage stability and expand the application possibilities of buriti oil. The objective of this work was to evaluate the impact of spray drying conditions on the microencapsulation of buriti oil, using response surface methodology. Bilayer emulsions were stabilized by whey protein isolate and high-methoxyl pectin and spray dried. The effects of inlet air temperature (154–196 °C) and feed flow rate (1.2–6.8 mL/min) on different properties of the microcapsules were evaluated. Higher air temperatures caused a positive effect on process yield but affected the color and encapsulation efficiency, while the increase in feed flow rate had a positive effect on the color of microcapsules. The higher drying rates negatively affected the microcapsules, resulting in larger and agglomerated particles, with the presence of holes in their surface. Surface models were obtained to predict color parameters of the microcapsules, which can be used as tools to quality control during processing. In general, the low drying rate resulted in microcapsules with suitable characteristics to ensure oil protection. The optimized spray drying process allows the production of buriti oil microcapsules with potential for application as natural pigments in the food industry.

A novel ratiometric formaldehyde fluorescent probe for applications in environmental, food, and biological systems

Formaldehyde (FA) is a toxic, irritating, colorless gas molecule widely used in food preservation, construction, paint, pharmaceutical and chemical industries. However, FA may enter the air, water and soil during its release, causing ecological damage and jeopardizing human health. Therefore, it is significant to seek a simple and effective assay for detecting FA in environment, food, and biological systems. Here, we designed and synthesized a novel phenothiazine-based fluorescent probe, JD-1, which exhibits ratiometric emission responses to FA at 400 nm and 505 nm. In addition, a solid sensor prepared by loading the probe JD-1 onto filter paper successfully achieved visual detection of liquid and gaseous FA. Notably, to further investigate the application scenarios of probe JD-1 in the detection of FA, we also prepared electrostatically spun fiber membranes by mixing probe JD-1 with PVDF-HFP, which were successfully used for the selective detection of FA. And the probe JD-1 possessed excellent stability in the detection of FA in real food samples, soil, live cells and zebrafish. Thus, this probe provides an attractive assay for the detection of FA in environment food, biological systems.

ВИКОРИСТАННЯ ОЛІГОМЕРІВ НА ОСНОВІ ПОБІЧНИХ ПРОДУКТІВ ВИРОБНИЦТВА ЕТЕНУ В ЛАКОФАРБОВИХ МАТЕРІАЛАХ

The results of the study of the use of oligomers obtained by di-tert-butyl peroxide-initiated oligomerization of C5 and C9 hydrocarbon fractions of liquid by-products of ethene production by pyrolysis of petroleum raw materials as synthetic substitutes for vegetable oil in the production of paint materials, in particular Oxol oils, are given. It was established that the use of 54.5 wt. % of the oil A 60 % solution of the oligomer in white spirit makes it possible to obtain a product that meets the requirements of TU U 20.3-37168270-044:2017, which will allow the release of significant amounts of edible vegetable oils, which are used for technical purposes in the paint industry of Ukraine.

Sustainable Napier Grass (Pennisetum purpureum) Biochar for the Sorptive Removal of Acid Orange 7 (AO7) from Water

The unregulated discharge of synthetic dyes from various anthropogenic and industrial activities has resulted in the contamination of different environmental compartments. These dyes can contaminate water bodies, soil, and even the air, resulting in many environmental and health issues. True colors may persist for long periods, thereby affecting the aesthetics and ecology of dye-contaminated areas. Furthermore, they pose potential risks to aquatic life and human health through the ingestion or absorption of dye-contaminated water or food. Acid orange 7 (AO7) is a synthetic azo dye used in the textile, tanning, food, pharmaceutical, paint, electronics, cosmetics, and paper and pulp industries. AO7 can have various human health implications, such as dermatitis, nausea, severe headache, respiratory tract irritation, and bone marrow depletion, due to its high toxicity, mutagenicity, and carcinogenicity. Efforts to regulate and mitigate dye pollution (AO7) are crucial for environmental sustainability and public health. Therefore, this study aimed to remove AO7 from water using sustainable biochar. This objective was accomplished by pyrolyzing dried Napier grass at 700 °C to develop affordable and sustainable Napier grass biochar (NGBC700). The developed biochar was characterized for its surface morphology, surface functional groups, surface area, and elemental composition. The yield, moisture content, and ash content of the NGBC700 were approximately 31%, 6%, and 21%, respectively. The NGBC700’s BET (Brunauer–Emmett–Teller) surface area was 108 . Batch sorption studies were carried out at different pH levels (2–10), biochar dosages (1, 2, 3, and 4 ), and AO7 concentrations (10, 20, and 30 . The kinetic data were better fitted to the pseudo-second-order (PSO) equation (R2 = 0.964–0.997) than the pseudo-first-order (PFO) equation (R2 = 0.789–0.988). The Freundlich isotherm equation (R2 = 0.965–0.994) fitted the sorption equilibrium data better than the Langmuir equation (R2 = 0.788–0.987), suggesting AO7 sorption on heterogenous NGBC700. The maximum monolayer AO7 adsorption capacities of the NGBC700 were 14.3, 12.7, and 8.4 at 10, 25, and 40 °C, respectively. The column AO7 sorption capacity was 4.4. Fixed-bed AO7 sorption data were fitted to the Thomas and Yoon–Nelson column models. The NGBC700 efficiently removed AO7 from locally available dye-laden wastewater. NGBC700 was regenerated using different NaOH concentrations. Possible interactions contributing to AO7 sorption on NGBC700 include hydrogen bonding, electrostatic interactions, and π–π electron donor–acceptor attractions. The estimated total preparation cost of NGBC700 was US$ 6.02 kg−1. The developed sustainable NGBC700 is potentially cost-effective and environmentally friendly, and it utilizes waste (Napier grass) to eliminate fatal AO7 dye from aqueous media.