Mutual Promotion Effect Research Articles

Heterogeneous NASICON-Type Cathode With Reversible Multielectron Reaction for High-Performance Sodium-Ion Batteries.

Na superionic conductor (NASICON)-structured compounds demonstrate great application potential by their robust framework and compositional diversity. However, they are blamed for the mediocre energy density, and achieving both multielectron reaction and good cycling stability simultaneously is challenging. Herein, a novel heterogeneous Na4Fe3(PO4)2(P2O7)/Na2VTi(PO4)3 (NFPP/NVTP) material with stable multielectron reaction is constructed by spray drying technology. The mutual promotion effect of intergrowth structures effectively improves the purity and the crystallization of NFPP/NVTP during the fabrication process, which is beneficial to the high capacity and cycling stability. As a result, the optimized NFPP/NVTP demonstrates a high reversible capacity of 155.3 mAh g-1 at 20mA g-1 and outstanding cycling stability with 82.9% capacity retention over 2500 cycles at 1 A g-1, which are much superior to those of NFPP and NVTP individually. Even in full cell configuration, the energy density remains high at ≈380Wh kg-1 based on the cathode mass. The high capacity of NFPP/NVTP is also attributed to the successive reduction/oxidation mechanism involving the introduction of Ti3+ and interfacial charge redistribution effect between the heterogeneous phases, which greatly improve the electronic and ionic conductivity. Moreover, high reversible structural evolution during the multisodium storage process further guarantees excellent cycling stability.

The evolution of cooperation and global synchronization in the evolutionary Kuramoto dilemma combined with the prisoner's dilemma

In this work, we have studied the evolution of the cooperation and the global synchronization on the Kuramoto model upon random networks with two games, in which one is the evolutionary Kuramoto dilemma and the other is the weak prisoner's dilemma. Agents can gain their payoffs from these two games synchronously. In the evolutionary Kuramoto game, cooperators prefer the formation of local synchronization but pay less cooperative cost. Cooperators in weak prisoner's dilemma can form cooperator clusters because of the network reciprocity. Combining these two games shows a mutual promotion effect upon the order of the global synchronization but a competition effect on the cooperation level. The global synchronization begins to rise only when most agents choose cooperation. It is manifested by the fact that the optimal coupling strength for the highest cooperation level is smaller than that for the highest synchronization level. The high cooperation cost makes defection the most advantageous strategy when the coupling strength reaches rather high, which diminishes the effect of cooperator clusters, and ultimately results in the absence of both cooperators and global synchronization. When agents have more neighbors in the random network, it is observed that cooperation is consistently hindered unless the coupling strength is relatively small. Additionally, there is always an optimal average degree that allows for global synchronization.

Response of early diagenesis to methane leakage in the inner shelf of the East China Sea

Shelf seas are experiencing a rise in shallow gas leaks, primarily methane, raising concerns due to their environmental impact. However, the effect of the leaks on early diagenesis remains poorly understood. This study analyzes sediment lithology, organic geochemistry and porewater geochemistry of two short cores collected nearby the pockmarks in the muddy inner shelf of the East China Sea. Our findings clearly demonstrate the impact of methane leakage on early diagenesis, evidenced by the shallower position of the SMTZ (sulfate-methane transition zone), higher concentrations of uranium (U), vanadium (V), and manganese (Mn) in the porewater near and above the SMTZ, and downcore decrease in Mg2+, Ca2+, and Sr2+ concentrations versus increase in Mg2+/Ca2+ and Sr2+/Ca2+ ratios. Their profile variations and the difference between two cores are determined by the intensity of methane leakage. The estimated methane diffusive flux of 619 mmol m-2 yr-1 at YEC7–2 is roughly 8.5 times that at YEC7–1 (73 mmol m-2 yr-1), consistent with a shorter distance of YEC7–2 to the pockmark with active methane leakage. A schematic model is summarized to demonstrate the response of early diagenesis processes to the increasing methane leakages in response to changing sedimentation regimes from accretion to severe erosion. This study undoubtedly improves our understanding mutual promotion effect between seafloor erosion and gas leakage, and their impact on early diagenesis processes and resultant porewater geochemical changes and authigenic mineral records.

Highly efficient nitric oxide absorption by low viscosity superbase/amide deep eutectic solvents through mutual promotion effect

A series of low-viscous deep eutectic solvents (DESs) with superbase as HBA and amide as HBD were designed and prepared for NO absorption. Impressively, both a comparably low viscosity of 8.07 mPa∙s and a high absorption capacity of 6.43 mol∙kg−1 (∼0.19 kg/kg) at 293.2 K were achieved, which was superior to that of other reported absorbents. Through a combination of absorption experiments, FT-IR characterization, and thermodynamic modelling, the results indicated that such a high solubility for NO was originated from the mutual promotion effect between the superbase and the amide. Considering that chemical absorption occurred accompanied with physical one, a reaction equilibrium thermodynamic model (RETM) equation was derived to correlate the experiment solubility data, so that the thermodynamic parameters were obtained to evaluate the absorption process. The absorption-desorption cycle experiment revealed that the regeneration efficiency of the superbase/amide DESs could be high up to 90 %. Given the low viscosity, high absorption capacity and excellent recycle efficiency, the superbase/amide DES was considered as a promising candidate for NO capture and utilization.

Tribocorrosion of CrN coatings on different steel substrates

In this paper, CrN coatings were deposited on AISI 1045 steel, AISI H13 steel, and AISI 2205 duplex stainless steel substrates using arc ion plating. The effects of substrate characteristics on the hardcoated sample properties, especially tribocorrosion performance were investigated systematically. The results show that there were little differences in the surface morphology, crystalline structure as well as nanohardness among the three hardcoated samples. Compared with the bare substrates, the electrochemical properties of 1045-CrN and H13-CrN in 3.5 wt% NaCl solution were significantly improved with the Icorr values of 2.10 × 10−6 A·cm−2 and 9.63 × 10−7 A·cm−2, respectively, but still worse than that of 2205-CrN specimen (1.84 × 10−8 A·cm−2). The Ecorr of 2205-CrN was over 200 mV higher than those of 1045-CrN and H13-CrN. In addition, 2205-CrN displayed the highest Rct value of 1.953 × 106 Ω·cm2, which was enhanced by two orders of magnitude compared to the other two specimens owing to the excellent corrosion resistance of AISI 2205 steel substrate. The tribocorrosion rates of the three hardcoated specimens in 3.5 wt% NaCl solution were significantly reduced compared with their underlying substrates (by 70 %, 36 %, and 85 % for 1045-CrN, H13-CrN, and 2205-CrN, respectively). The 2205-CrN specimen displayed the best tribocorrosion performance with the rate of 2.51 × 10−6 mm3·N−1·m−1. The tribocorrosion mechanisms of CrN coatings deposited on carbon and stainless steels were also discussed. Mutual promotion effect of corrosion and wear was confirmed for CrN-coated carbon steels, while a negative synergistic effect was observed from the CrN-coated stainless steel substrate.

Humidity related failure mechanism of IGBTs considering dynamic avalanche

The investigation of humidity related failure mechanism (HRFM) is of high importance for reliable operation of IGBTs. Mostly, the investigation of the HRFM is implemented under static voltage conditions. This, however, may be inapplicable because there is an obvious difference between the test condition and the practical condition. To address this, in this paper, the HRFM with the condition of dynamic avalanche is thoroughly investigated. The promoting effects of humidity on the electric field and current density during dynamic avalanche progress are qualitatively analyzed. Then, the temperature and current density distributions of the IGBT module under humidity conditions and normal conditions are compared through simulations. According to the performance comparison, it is revealed that, the humidity makes an obvious contribution to the mutual promotion effect of electric field and current density. Consequently, the operation of IGBT is susceptible to exceed the safe operating area during dynamic avalanche process. Finally, experimental tests are carried out to verify the theoretical analysis.

Self-regulated S-scheme heterojunction for synergistic removal of tetracycline and hexavalent chromium: Synergistic mechanism of trivalent chromium

The limitation of conventional photocatalysts in simultaneously removing Tetracycline (TC), hexavalent chromium (Cr (VI)) and trivalent chromium (Cr (III)) were addressed in mixed pollution treatment. The S-scheme heterojunction of titanate nanotubes/Bi2WO6 (TNTs/BWO) was successfully constructed to achieve efficient removal of TC, Cr (VI), and Cr (III). The theoretical calculations (DFT) demonstrated that TNTs’ ion exchange properties led to the partial replacement of interlayer Na+ by Cr (III), optimizing the S-scheme heterojunction during the photocatalytic reaction. Experimental results revealed that the coexistence of TC, Cr (VI), and Cr (III) had a mutual promotion effect, as evidenced by the apparent rate constant of Cr (VI) reaching 0.7 min−1, which was 87.5 times higher than that of the single pollutant system, while maintaining a high apparent rate constant for TC. The likely intermediate products, degradation pathways, and photocatalytic mechanism were also elucidated using DFT molecular orbitals and Fukui index analysis. This work provides new insights and strategies for simultaneously removing pollutants and contributes to wastewater purification.

Relationship between Eosinophilic and Neutrophilic Inflammation in Chinese Chronic Rhinosinusitis with Nasal Polyps

Introduction: Chronic rhinosinusitis with nasal polyps (CRSwNPs) in China is characterized by a mixed eosinophilic-neutrophilic inflammation, linking to a more heterogeneous clinical phenotype. However, the relationship between eosinophilic and neutrophilic inflammation in Chinese patients with CRSwNP remains largely unknown. We aimed to further characterize the correlation between neutrophils with eosinophils in relation to clinical characters and disease control status after endoscopic sinus surgery (ESS). Methods: A total of 242 patients were recruited and stratified based on tissue (≥10%) eosinophilia and (≥20/per high-power field) neutrophilia. Clinical characteristics and disease control status were compared between subgroups. Associations between tissue eosinophils and neutrophils were analyzed. Results: The uncontrolled patients accounted for 41.3%, 41.3%, 17.1%, and 22.2% in subjects with concomitant tissue eosinophilia and neutrophilia (EN-high), isolated eosinophilia (E-high), isolated neutrophilia (N-high), and no eosinophilia and neutrophilia (EN-low), respectively. Positive correlations between tissue eosinophils and neutrophils were observed in patients with CRSwNP as well as in EN-high and N-high subgroups but not in E-high and EN-low subgroups. The EN-high subgroup had higher tissue eosinophil numbers than the other three subgroups. Both EN-high and E-high subgroups had higher rates of uncontrolled subjects than the N-high and EN-low subgroups; however, there was no difference in the rate of uncontrolled subjects between EN-high and E-high subgroups and between N-high and EN-low subgroups. Conclusion: Tissue neutrophils might have a potential interaction and mutual promotion effect with eosinophils in CRSwNP. However, tissue neutrophilia would not pose significant risk for poor disease control after ESS. Further larger, prospective studies are needed to confirm our findings.

Damage evolution mechanism of loess slope under the combination of freeze-thaw cycles and earthquake

The Loess Plateau in China is composed of a large number of frozen soil with frequent earthquakes. Freeze-thaw cycles and earthquakes both lead to soil damage and strength degradation, resulting in a large number of landslides. However, the research on damage evolution mechanism of loess slope under the combination of freeze-thaw cycles and earthquake is weak. Considering the effect of freeze-thaw cycles and earthquake on loess slopes, a shaking-table test on slope models with and without freeze-thaw cycles was conducted and the slope damage was monitored in real time through electrical measurement. The results indicate that the loess damage caused by freeze-thaw cycles aggravated the response of slope during earthquake—"Freeze-thaw and earthquake mutual promotion effect”. The damage factor increased slowly to 0.17 due to the moisture migration and pore connectivity during freeze-thaw cycles, and it increased rapidly to 0.69 due to continuous cracks expand during earthquake. Moreover, the cyclic migration of water to the slope surface caused by freeze-thaw cycles and vibration intensifies the damage along slope in the deep direction. Damage depth (30 cm) is greater than frozen depth (10 cm), increasing the risk of the deep loess landslide.

Synergistic Catalytic Oxidation of Typical Volatile Organic Compound Mixtures on Mn-Based Catalysts: Significant Promotion Effect and Reaction Mechanism.

The miscellaneous volatile organic compounds (VOCs) in industrial flue gas streams usually demonstrate significant mutual inhibition effects, and the behavior of a particular VOC in mixtures is not clear, which hinders the application of catalytic technology. This study examines the catalytic oxidation and mixing effects of representative VOCs in industrial exhausts, consisting of acetone (AC), ethyl acetate (EA), and toluene (Tol), on common Mn-based catalysts (e.g., MnO2, Mn2O3, LaMnO3, and Mn3O4) by means of intrinsic activity evaluation, coadsorption, VOC temperature-programmed oxidation, in situ diffuse reflectance infrared Fourier transform spectroscopy, and gas chromatography-mass spectrometry. The results showed no inhibiting effect on the conversion of these VOCs when combusted together; instead, a significant mutual promotion effect was found, especially on Tol destruction, with a sharp decrease in the Tol T50 from 214 to 158 °C on MnO2. It is proposed for the first time that the addition of AC/EA in Tol combustion leads to the generation of o/m-methyl phenol, which changes the rate-determining step of the ring-opening process, thus elevating the conversion of Tol together with AC and EA in the mixture at low temperatures.

Research on the impacts of dual environmental regulation on regional carbon emissions under the goal of carbon neutrality-the intermediary role of green technology innovation

As an important means to promote regional low-carbon development, environmental regulation has great theoretical and practical significance for achieving the goal of carbon-neutral development in China. Based on the panel data of 30 provinces and cities in China from 2005 to 2019, this paper first uses the intermediary effect model to analyze the impact of the implementation of environmental regulation policies on regional carbon emissions, discusses the relationship between environmental regulation, green technology innovation and carbon emissions, and further uses the threshold effect model to discuss the nonlinear relationship between environmental regulation and regional carbon emissions. The results show that: the improvement of formal and informal environmental regulation can play a role in “forced emission reduction”; Green technology innovation plays a complete intermediary role in the impact of environmental regulation on regional carbon emissions; At the same time, the impact of formal and informal environmental regulation on regional carbon emissions has a threshold effect. Among them, formal environmental regulation has a double threshold effect, the threshold values are 0.429 and 0.502 respectively, while informal environmental regulation has a single threshold effect, the threshold value is 1.803. The results of heterogeneity analysis show that there are obvious differences in the implementation effects of environmental regulation policies under different economic development levels and industrialization development stages. Therefore, we should pay attention to the mutual promotion effect of different types of environmental regulation, strengthen the collaborative emission reduction of environmental regulation and green technology innovation, and improve the level of regional green technology innovation, so as to better promote the realization of regional carbon neutrality goals.

Thermal degradation of cellulose and coal gangue based on lumped reaction model and principal component analysis

The effect of cellulose on pyrolysis characteristics of coal gangue was studied based on TG-FTIR experiment. Cellulose with different mass ratios is added to coal gangue. Synergistic effect between cellulose and coal gangue on mass loss was observed in this study. CG1CEL1 and CG1CEL3 samples have mutual promotion effect between CG and CEL. Conversely, the inhibitory effect of CG3CEL1 between CG and CEL was evident at high temperature. The reaction mechanism of coal gangue and cellulose co-pyrolysis based on lumped reaction model was determined. Furthermore, the comprehensive influencing factors of coal gangue and cellulose co-pyrolysis were analyzed by principal component analysis. There is little research on the influence mechanism of cellulose, the main component of biomass, on the pyrolysis of coal gangue. This paper is of great significance to clarify the mechanism of co-pyrolysis of biomass and coal gangue. This study provides a basis for revealing the influence mechanism of cellulose on coal gangue pyrolysis, which accelerates the process of carbon neutralization. This can promote resource disposal of coal gangue by reduction, so as to reduce environmental pollution and improve the utilization rate of fossil energy.

Semi-supervised medical image segmentation via a tripled-uncertainty guided mean teacher model with contrastive learning.

Due to the difficulty in accessing a large amount of labeled data, semi-supervised learning is becoming an attractive solution in medical image segmentation. To make use of unlabeled data, current popular semi-supervised methods (e.g., temporal ensembling, mean teacher) mainly impose data-level and model-level consistency on unlabeled data. In this paper, we argue that in addition to these strategies, we could further utilize auxiliary tasks and consider task-level consistency to better excavate effective representations from unlabeled data for segmentation. Specifically, we introduce two auxiliary tasks, i.e., a foreground and background reconstruction task for capturing semantic information and a signed distance field (SDF) prediction task for imposing shape constraint, and explore the mutual promotion effect between the two auxiliary and the segmentation tasks based on mean teacher architecture. Moreover, to handle the potential bias of the teacher model caused by annotation scarcity, we develop a tripled-uncertainty guided framework to encourage the three tasks in the student model to learn more reliable knowledge from the teacher. When calculating uncertainty, we propose an uncertainty weighted integration (UWI) strategy for yielding the segmentation predictions of the teacher. In addition, following the advance of unsupervised learning in leveraging the unlabeled data, we also incorporate a contrastive learning based constraint to help the encoders extract more distinct representations to promote the medical image segmentation performance. Extensive experiments on the public 2017 ACDC dataset and the PROMISE12 dataset have demonstrated the effectiveness of our method.

The Impact of Radiation Dose to Heart Substructures on Major Coronary Events and Patient Survival after Chemoradiation Therapy for Esophageal Cancer.

Simple SummaryWhether it is necessary to evaluate the radiation exposure of cardiac substructures when making radiotherapy plans is one of the current research hotspots. In this cohort study of 355 patients with esophageal cancer, the radiation dose to key coronary substructures such as the left anterior descending artery V30Gy and mean left main coronary artery was closely associated with major coronary events and overall patient survival, and showed better predictive value than the mean heart dose or heart V30Gy recommended by current guidelines. Our findings suggest that, in addition to the whole heart, key coronary substructures should be contoured as organs at risk during radiotherapy plan optimization.Background: There is a paucity of data regarding the association between radiation exposure of heart substructures and the incidence of major coronary events (MCEs) in patients with esophageal cancer (ESOC) undergoing chemoradiation therapy. We studied radiation dosimetric determinants of MCE risk and measured their impact on patient prognosis using a cohort of ESOC patients treated at a single institution. Methods: Between March 2005 and October 2015, 355 ESOC patients treated with concurrent chemoradiotherapy were identified from a prospectively maintained and institutional-regulatory-board-approved clinical database. Dose-distribution parameters of the whole heart, the atria, the ventricles, the left main coronary artery, and three main coronary arteries were extracted for analysis. Results: Within a median follow-up time of 67 months, 14 patients experienced MCEs at a median of 16 months. The incidence of MCEs was significantly associated with the left anterior descending coronary artery (LAD) receiving ≥30 Gy (V30Gy) (p = 0.048). Patients receiving LAD V30Gy ≥ 10% of volume experienced a higher incidence of MCEs versus the LAD V30Gy < 10% group (p = 0.044). The relative rate of death increased with the left main coronary artery (LMA) mean dose (Gy) (p = 0.002). Furthermore, a mutual promotion effect of hyperlipidemia and RT on MCEs was observed. Conclusion: Radiation dose to coronary substructures is associated with MCEs and overall survival in patients with ESOC. In this study, the doses to these substructures appeared to be better predictors of toxicity outcomes than mean heart dose (MHD) or whole-heart V30Gy. These findings have implications for reducing coronary events through radiation therapy planning.

Multi-element Interactive Improvement Mechanism of Coal Fly Ash-Based Soil Conditioner on Wheat.

Globally, coal fly ash (CFA) is a bulk industrial solid waste that is difficult to be disposed of, which posed serious environmental risks to the atmosphere, water, and soil. Besides, the food crisis outbreaks worldwide. In this case, the utilization of CFA to produce soil amendments is expected to improve the soil quality and to increase the grain yield. This paper took the soil conditioner prepared by chemical activation method as the research object, analyzed, and found out its mechanism when increasing the yield and improving the quality of crops. First, the simulated hydroponics method was used to identify the key yield-increasing factors in the soil conditioner as well as the effects of those factors by taking the plant height, stem thickness, dry weight, and fresh weight of wheat as indicators at the early stage of growth. Then, SPSS was used to analyze the interaction among K, P, and other four middle trace elements in the stem and the leaf of wheat. The results showed that for wheat seedlings, there were strong interactions between Fe and Mg, Mg and Ca, and Ca and Si. Fe had a significant enhancement effect on the fresh weight of wheat seedlings. Mg had a significant enhancement effect on both the fresh weight and dry weight of wheat seedlings. Si can greatly enhance the dry weight and plant height, and Ca can greatly increase the stem thickness. It was also found that the soil conditioner and the basic N, P, and K fertilizer had a good mutual promotion effect. Among the four elements, Mg and Si are the key growth factors. When the nutrient elements were relatively poor, the increase of Mg by 50% would lead to the growth of the fresh weight of wheat seedlings by 65%; when the content of active Si increased by 50%, the fresh weight would increase by 52%. Therefore, the soil conditioner prepared by modified treatment of CFA owns a good application prospect to increase the yield and quality of crops.

Mutual promotion effect of Ni and Mo2C encapsulated in N-doped porous carbon on bifunctional overall urea oxidation catalysis

Efficient hydrogen production from water splitting is crucial for sustainable energy and yet impeded by sluggish anodic water oxidation. Urea oxidation had been considered as an alternative reaction due to its much lower oxidation potential. Rational design of highly efficient cost-effective electrocatalysts for urea oxidation is therefore urgent for hydrogen production from overall urea oxidation. Here, the Ni/Mo2C@CN catalyst consisting of a porous carbon shell and a heterojunction Ni/Mo2C core was constructed by an in situ self-confinement synthesis strategy. The mutual promotion effect of Ni and Mo2C can boost the urea oxidation and hydrogen evolution reactions at the same time. Only 1.51 V applied potential was needed to achieve stable 10 mA/cm2 overall urea oxidation on the Ni/Mo2C@CN catalyst. By considering the great stability resulting from the protective effect of the carbon shell, a practical application potential of Ni/Mo2C@CN in overall urea oxidation was achieved.

Incorporating environmental impacts into zero-point shifting diagnosis of wind turbines yaw angle

The diagnostic mechanism of yaw angle zero-point shifting (ZPS) of wind turbines (WTs) is based on the variation of the output power at different yaw angles. However, the output power is significantly affected by environmental factors. To improve the diagnostic performance, a diagnostic method based on SCiForest and Sparse Gaussian Process Regression (SGPR) is proposed, in which two environmental factors including air temperature and turbulence intensity are incorporated into the ZPS diagnosis procedure. On this basis, the diagnostic model is developed, the diagnostic performance is explored by considering the individual and coupling effect of environmental factors, and the model validation is made on the actual operation data of the three 3 MW WTs. The validation results show that the air temperature and turbulence intensity have a mutual promotion effect on the diagnostic performance. Specifically, the diagnostic accuracy for the three WTs is slightly improved by including the individual effect of the environmental factors, while it is noticeably enhanced by 68.706 %, 65.411 % and 59.572 %, respectively, considering the coupling effect. After calibrating the yaw angle ZPS, the annual profit for the three WTs can be increased by 9.150 %, 15.417 % and 21.649 %, respectively, which shows the proposed method has the potential in improving the operation efficiency of the WTs and reducing the cost of wind power.

Mutual Promotion of LAP2 and CAT2 Synergistically Regulates Plant Salt and Osmotic Stress Tolerance.

Almost all abiotic stresses induce reactive oxygen species (ROS) overaccumulation, causing oxidative damages to plant cells. Catalase (CAT) plays a vital role in plant oxidative stress tolerance by scavenging stress-induced excess H2O2; thus, the identification of factors regulating catalase function will shed light on the underlying regulatory mechanisms. Here, we identified leucine aminopeptidase 2 (LAP2) as a novel CAT2-interacting protein and showed a mutual promotion effect of the two proteins in plant stress responses. LAP2 has a physical interaction with CAT2 in plant cells. The loss-of-function mutant of LAP2, lap2-3, is hypersensitive to salt or osmotic stress with increased ROS accumulation and malondialdehyde content and decreased catalase activity. The lap2-3 mutant has less CAT2 protein levels as CAT2 protein stability is impaired in the mutant. Scavenging excess ROS by glutathione or overexpressing CAT2 in the lap2-3 mutant recovers its hypersensitive phenotype to salt or osmotic stress. Further study showed that CAT2 promotes LAP2 hydrolysis activity with leucine-4-methylcoumaryl-7-amides as a substrate in vivo and in vitro, and thus, similar to the lap2-3 mutant, the cat2-1 mutant also has lower γ-aminobutyric acid content than the wild type. Together, our study reveals mutual promotion effects of CAT2 and LAP2 in conferring plant salt and osmotic stress tolerance.

Fabricating magnetic GO/ZIF-8 nanocomposite for amphetamine adsorption from water: Capability and mechanism

The capture and separation properties of the three-dimensional Fe3O4/GO/ZIF-8 towards amphetamine were investigated. The combination of Fe3O4/GO and ZIF-8 has been designed through a facile self-assembly process, to exhibit the advantages of both and play the synergistic effect. Such nanocomposite was assessed as amphetamine adsorbent via batch experiments to determine the adsorption capacity, reusability and stability. Experimental characterizations consisting of adsorption isotherms, kinetics, thermodynamics, pH effect and ionic effect, in combination with theoretical calculations demonstrated the critical contribution of the hydrogen bonding interaction (O…H−N), π-π interaction and Zn−N chelation interaction during amphetamine adsorption process. Under the condition of introducing the Fe3O4, GO and ZIF-8 effectively realized the mutual promotion effect, among which GO increased the specific surface area and good dispersibility of Fe3O4/ZIF-8, and ZIF-8 obviously enhanced the stability of Fe3O4/GO. This work provided more options for the synthesis of high efficiency and functional adsorbents for psychoactive substances.

Mutual promotion effect of SO2 and NOx during yellow phosphorus and phosphate rock slurry adsorption process

AbstractRemoving SO2 and NOx released from middle and small‐scaled coal‐burning boiler is one important strategy for air pollution control. Herein, we first report a novel process on simultaneous eliminating SO2 and NOx at low temperature, by employing large scale and cheap sources of phosphorus sludge and phosphate rock slurry. The results showed that 100% desulfurization and denitrification efficiency can be obtained, and there exhibited a significant mutual‐promoting effect between SO2 and NOx abatement processes. Based on characterizations and theoretical calculation results, it was found that the active substances produced by the interaction of sulfur and nitrogen species played a significant role in promoting the removal of SO2 and NOx. Compared with traditional purification technology, this process can achieve simultaneous desulfurization and denitrification with no discharge of secondary pollutants, and can be regarded as a new and economic technology for efficient removal of SO2 and NOx in industrial scale.