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Natural antibacterial membranes prepared using Schisandra chinensis extracts and polyvinyl alcohol in an environment-friendly manner

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Chemosphere 2024年 346卷 140524页

作者： Jia, Wenting Jiang, Shanxue Wang, Fang Li, Jing Wang, Zeru Yao, Zhiliang School of Ecology and Environment Beijing Technology and Business University Beijing100048 China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business University Beijing100048 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China

Foodborne pathogens can cause food spoilage and lead to food safety issues. In recent years, food packaging has received a lot of attention. Traditional packaging membranes are non-biodegradable and remain in the environment for a long time. In this study, natural antimicrobial substances were extracted from Schisandra chinensis by a green extraction process using distilled water as the solvent, and the effects of different treatment on the antimicrobial activity of the extract were compared. At the same time, four types of Schisandra chinensis antimicrobial membranes were prepared using polyvinyl alcohol (PVA) as the substrate. The whole extraction and membrane preparation process did not involve organic solvents, making the process green and environment friendly. Material characterization included inverted biological microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), tensile strength test, pore size measurement, water uptake test, etc. Among them, no extract particles were observed with the naked eye on the surfaces of MⅡ and MⅣ. MⅡ has a uniformly transparent, nearly colorless morphology and is the most tensile. MⅣ surface is flat and smooth, the microstructure is dense and uniform. At the same time, the four types of membranes were tested against common pathogenic bacteria for 12 h, and the OD600 trend revealed the excellent antimicrobial activity of the membranes against S. aureus, MRSA, E. coli, and L. monocytogenes. The membranes could also be reused at least once. This study provides a new idea for preparing natural plant-based antimicrobial membranes. © 2023 Elsevier Ltd

关键词： Food safety

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Real-Time Visualized Generator for the simulation of Wastewater Quality and Quantity Variations in the Sewer System

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SSRN 2024年

作者： Liu, Yanchen Islam, Md Sahidul Huang, Xia Li, Bo Chen, Jiale Min, HongPing Tang, Dingding Mao, Jianhua Wang, Moran Zhang, Mingkai Shi, Hanchang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China China Construction Third Bureau Green Industry Investment Co. Ltd Wuhan430100 China Beijing Enterprises Water Group Limited Beijing100102 China South China Institute of Environmental Science Ministry of Ecology and Environment Guangzhou510655 China

The lack of information or missing connection of sewer pipes in both combined and separated systems seriously disturbs the obtaining of real regulated operational information of the sewerage system. In order to accurately regenerate the lost actual operational data along sewer shed, a visualized generator based on real-time monitoring data was developed to simulate wastewater quantity and quality variations within different scales in sewer system. A novel instantaneous unit pollutant-hydrograph modeling associated with simple wastewater electric conductivity monitoring data was proposed in the generator. The validated generation data of flow, COD, ammonia nitrogen, and phosphate were well-fitted with the full-scale monitoring data in residential areas, pump stations, and WWTPs. This generator could be used to predict and simulate the dynamic flow and wastewater quality variations at any sewer network-wide location. The dynamic wastewater quality and quantity along the whole sewer-shed could be simulated based on the modular flow generator to support the operation and management of pump stations and WWTPs. © 2024, The Authors. All rights reserved.

关键词： Ammonia

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Unveiling Distinct Influencing Mechanisms of Br- on Ndma Formation During Ozonation of Actual Water Matrixes: Identification of Precursors and Brominated Substance

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SSRN 2024年

作者： Gao, Menglan Liao, Xiaobin Chen, Shuting Li, Xiaoying Zhang, Yirou Chen, Chao Qi, Huan Institute of Municipal and Environmental Engineering College of Civil Engineering Huaqiao University Fujian361021 China College of Textiles and Apparel Quanzhou Normal University Fujian362002 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Bromide ion (Br-) in water sources has been found to affect the formation of carcinogenic non-brominated N-nitrosodimethylamine (NDMA) during ozonation of typical amines. The increasing bromide levels bring more concern due to climate change and industrial discharge, but its effects on actual water matrixes were still unclear. In this study, the effects of Br- on NDMA formation from three actual water matrixes were investigated (promotion, promotion then inhibition, and subtle influence);from which the NDMA precursors were screened and some were selected for exploring the influencing mechanisms. The results indicated that the roles of Br- on NDMA formation significantly depended on the water characteristics of actual matrixes. A total of 16 typical NDMA precursors, which were mainly derived from industrial, agricultural and pharmaceutical sources, were identified. Moreover, six brominated substance (Br-DMA, Br-UDMH, Br-DMSC, Br-DMS, Br-TMDS, Br2-TMDS), which were thought to play a crucial role in promoting NDMA formation, were also identified in actual water by precursor ion scan (PIS) method. Hypobromous acid (HOBr), which has been proved to be the culprit to the generation of brominated substances, tend to attack the electron-donating groups of amines, such as acylamino (-NHCO-R) or amidogen (-NH2) groups. However, the reactive bromine species (∙Br and ∙Br2-) was inclined to attack the aromatic and antioxidant moieties to produce Br-, as no bromine substitution but free radical transfer reaction occurs. Therefore, decreasing HOBr formation is the crucial step to reduce NDMA generation. This work would provide technical guide for NDMA risks control during ozonation of Br-amines co-containing water matrixes. © 2024, The Authors. All rights reserved.

关键词： Amines

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Highly Efficient and Selective Extraction of Phosphorous from Wastewater as Vivianite in a Strategically Operated Four-Chamber Flow Electrode Capacitive Deionization

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SSRN 2022年

作者： Liang, Peng He, Yunfei Zhang, Xiaori Zuo, Kuichang Yang, Fan Gao, Tie State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China The Key Laboratory of Water and Sediment Sciences Ministry of Education College of Environment Sciences and Engineering Peking University Beijing100871 China

Phosphorus (P) is not only one of the main contaminants in wastewater but also an essential nutrient for all living organisms. In this study, we demonstrate a highly efficient and selective process for extraction of P from wastewater in the form of solid vivianite using a strategically operated four-chamber flow electrode capacitive deionization (FC-FCDI). The separated diluate and concentrate chambers in FC-FCDI enables continuous production of dephosphorylated water and P-rich brine, realizing P removal rate (0.22 μmol/(cm2 ·min)) and enrichment efficiency (concentration factor of 17.2) much higher than previous studies. The spontaneously enriched competing ions in the concentrate mitigate their further migration due to concentration countering effect, realizing to date the highest selectivity for P over SO42- (4.4) in CDI systems. Most importantly, the precipitated vivianite has high P content (12.4%) and much smaller volume compared with the P-recovered solution in previous studies. The recovery of P in the solid state prevents the production of brine wastes, requires no water input for concentrate replenishment, and is conducive to transport, storage, and direct usage for various purposes. This work suggests a novel method for highly selective and efficient extraction of P from wastewater using tailor-designed and strategically-operated FC-FCDIs. © 2022, The Authors. All rights reserved.

关键词： Extraction

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New Insight into Opposite Oxidation Behavior in Acetone and Propane Catalytic Oxidation Over Comn Based Spinel Oxides

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SSRN 2023年

作者： Shan, Cangpeng Zhang, Yan Zhao, Qian Li, Jianbo Wang, Yunchong Han, Rui Liu, Caixia Liu, Qingling Tianjin Key Lab of Indoor Air Environmental Quality Control School of Environmental Science and Technology Tianjin University Tianjin300350 China State Key Laboratory of Engines Tianjin University Tianjin300350 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

CoMn spinel (CoMn) and Zn-substituted CoMn spinel (ZnCoMn) oxides were fabricated for revealing mechanism differences in acetone and propane catalytic oxidation. The temperature-conversion profiles, intrinsic reaction rate and activation energy convinced that CoMn and ZnCoMn exhibited high catalytic performance for acetone and propane oxidation, respectively. Experimental and theoretical investigation revealed that deep oxidation determined the acetone conversion, while the degradation of propane was governed by the fracture of C-H bond and subsequently the activation of C3H7. CoMn possessed more active lattice oxygen and superior oxygen activation capacity, allowing acetone to be directly converted into carboxylates without generating aldehydes. ZnCoMn with more high valence Mn species was conductive to the C-H bond dissociation and C3H7 activation. This work revealed the mutual relations between structure-property of the spinel oxides and reactivity of the diverse VOCs, which provided new insights for the rational design of spinel oxides for catalytic oxidation of diverse VOCs. © 2023, The Authors. All rights reserved.

关键词： Acetone

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Insights into in Situ Surface Reconstruction in Cobalt Perovskite Oxides for Enhanced Catalytic Activity

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SSRN 2024年

作者： Jin, Yanyu Cheng, Hongjun Wang, Qibao Liu, Xiaoqing Mo, Shengpeng Zhou, Bin Peng, Yue Wang, Yu Si, Wenzhe Li, Junhua School of Environmental Science and Engineering Yancheng Institute of Technology Yancheng224051 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China School of Environment and Safety Engineering North University of China Taiyuan030051 China School of Chemical & Environmental Engineering China University of Mining and Technology Beijing100084 China

An depth understanding of the fundamental interactions between surface termination and catalytic activity is crucial to prompt the properties of functional perovskite materials. The elastic energy due to size mismatch and electrostatic attraction of the charged Sr dopant by positively charged oxygen vacancies induced inert A-site surface enrichment rearrangement for perovskites . Lower temperatures could reduce A-site enrichment, but it is difficult to form perovskite crystals. La0.8Sr0.2CoO3-δ (LSCO) as a model perovskite oxide was modified with additive urea to reduce the crystallization temperature, and suppress Sr segregation. The LSCO catalysts with 600°C annealing temperature (LSCO-600) exhibited a 19.4-fold reaction reactivity of toluene oxidation than that with 800°C annealing temperature (LSCO-800). Combined surface-sensitive and depth-resolved techniques for surface and sub-surface analysis, surface Sr enrichment was effectively suppressed due to decreased oxygen vacancy concentration and smaller electrostatic driving force. DFT calculations and in-situ DRIFTS spectra well reveal that tuning the surface composition/termination affects the intrinsic reactivity. The catalyst surface with lower Sr enrichment could easily adsorb toluene, cleave, and decompose benzene rings, thus contributing to toluene degradation to CO2. This work demonstrates a green and efficient way to control surface composition and termination at the atomic scale for higher catalytic activity. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Role of biochar surface characteristics in the adsorption of aromatic compounds:Pore structure and functional groups

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Chinese Chemical Letters 2021年第10期32卷 2939-2946页

作者： Xue-Fei Tan Shi-Shu Zhu Ru-Peng Wang Yi-Di Chen Pau-Loke Show Feng-Fa Zhang Shih-Hsin Ho College of Materials and Chemical Engineering Heilongjiang Institute of TechnologyHarbin 150050China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbinShenzhen 518055China Institute of Technology(Shenzhen) Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham Malaysia43500 SemenyihSelangorMalaysia

Biochar(BC)are widely used as highly efficient adsorbents to alleviate aromatics-based contaminants due to their ease of preparation,wide availability,and high *** surface properties of BCs usually vary greatly due to their complex chemical constituents and different preparation processes and are reflected in the values of parameters such as the specific surface area(SSA),pore volume/size,and surface functional groups(SFGs).The effects of SSA and pore volume/size on the adsorption of aromatics have been widely ***,the corresponding mechanisms of BC SFGs towards aromatics adsorption remains unclear as the compositions of the SFGs are usually complex and hard to *** address in this gap in the literature,this review introduces a new perspective on the adsorption mechanisms of *** collecting previously-reported results,the parameters log P(logarithm of the Kow),polar surface area,and the positive/negative charges were carefully calculated using Chem Draw3D,which allowed the hydrophobicity/hydrophilicity properties,electron donor-acceptor interactions,Hbonding,and electrostatic interactions between SFGs and aromatics-based contaminates to be inferred *** predictions were consistent with the reported results and showed that tailor-made BCs can be designed according to the molecular weights,chemical structures,and polarities of the target ***,this review provides new insight into predicting the physicochemical properties of BCs through revealing the relationship between SFGs and adsorbates,which may provide useful guidance for the preparing of highly-efficient,functional BCs for the adsorption of aromatics.

关键词： Biochar Surface characteristics Aromatics Adsorption Surface functional groups

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Synergies between the Circular Economy and Carbon Emission Reduction

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SSRN 2024年

作者： Wang, Ning Bai, Yubing Guo, Zhanqiang Fan, Yu Meng, Fanxin Beijing Information Science and Technology University School of Economics and Management Beijing100192 China China Association of Circular Economy Beijing100037 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China Beijing Key Lab of Green Development Decision Making Based on Big Data Beijing100192 China

Climate change and sustainable development are two crucial drivers of transformation within economic development models. In turn, carbon emission reduction and the circular economy are two key engines pushing forward climate change and sustainable development programs, but the question remains, do they synergize with one another, or work against each other? This study approaches this question from both theoretical and practical perspectives. Utilizing a framework that combines theory and practice, bibliometric analysis and big data analysis of text were used to analyze the Web of Science database and 2.29GB of data taken from cases in China, to understand what synergies exist between carbon emission reduction and the circular economy. The study reveals that the predominant interaction between the circular economy and carbon emission reduction is synergistic, with few offsetting effects. In other words, the circular economy significantly promotes carbon emissions reduction. At the theoretical level, the two fields are gradually evolving toward in-depth research, while at the practical level, collaboration is coalescing around four areas: hot fields, potential fields, auxiliary fields and common goals. A noteworthy contribution of this study is the development of a framework that synergizes theory and practice, providing a structured approach for future research in this domain. By quantifying the synergistic and offsetting relationship between the circular economy and carbon emissions reduction through systematic big data analysis, this research offers insights essential for achieving the UN’s Sustainable Development Goals. We also emphasize the importance of diverse case studies and multi-dimensional data analyses in future research endeavors. © 2024, The Authors. All rights reserved.

关键词： Climate change

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Multifaceted Effects of Ultrasonic Enhanced Fe-C/Pds System for Sludge Dewatering and Resource Utilization: Synergy of Oxidation and Cracking Processes

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SSRN 2024年

作者： Li, Wenye Xie, Binghan Li, Qinghao Li, Zhipeng Zhu, Jing You, Hong Zhang, Guoyu Li, Weirun Xing, Xiaodi Zeng, Fanbo Li, Lingjie Zhao, Shuyu Shang, Zhiwei Wang, Shuxiao Harbin Institute of Technology Weihai Sch Marine Sci & Technol Weihai264209 China Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource & Environm Harbin150090 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The effective dewatering of waste activated sludge (WAS) and the utilization of resources are crucial for the sustainable development of wastewater treatment plants. In this study, ultrasonic (US) collaborative Fe-C activated peroxydisulfate (PDS) coupling system was constructed to investigate the shift in physicochemical properties and explore the mechanisms during the cracking and oxidation of WAS. The US enhanced Fe-C/PDS system exhibited excellent oxidation capacity with the water content (Wc) of sludge cake and the specific resistance to filtration (SRF) reducing to 61.71% and 1.12×1012 m/kg under the conditions of PDS, Fe-C, and US power levels at 120 mg/g TS, 300mg/g TS, and 150W. Furthermore, the high cracking capacity led to a rise in soluble chemical oxygen demand to 630.64 mg/L and a 9.16% reduction in volatile solids. Compared to Fe-C/PDS, the addition of US enhanced the leaching of Fe, promoted to the formation of reactive oxidative species. The contribution of ·O2-and 1O2 to sludge conditioning was 37% and 43.17%, indicating the oxidation process of free radicals and non-free radicals in Fe-C/PDS/US system. Additionally, US improved the cracking capacity of the system, releasing bound extracellular polymeric substances (EPS) and degrading into soluble properties. The concentration of short-chain fatty acids (SCFAs) in the sludge was increased by 96.7%, which significantly improved the quality of carbon source suitable for recycling. The positive improvement of sludge physicochemical properties revealed the decryption-degradation synergistic effect of the coupled systems. These findings provide a novel strategy for effective disposal and reduction in WAS while also offering valuable insights into resource utilization. © 2024, The Authors. All rights reserved.

关键词： Dewatering

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Deciphering Changes in the Abundance of Intracellular and Extracellular Antibiotic Resistance Genes and Mobile Genetic Elements Under Anaerobic Fermentation: Driven by Bacterial Community

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SSRN 2022年

作者： Yu, Peng Dong, Peiyan Wang, Hui State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China The Key Laboratory of Water and Sediment Sciences Ministry of Education College of Environmental Sciences and Engineering Peking University Beijing100871 China

In this study, the effects of initial pH values (3, 5, 7, 11) on intracellular and extracellular antibiotic resistance genes (iARGs and eARGs) and mobile genetic elements (MGEs) during anaerobic fermentation of swine manure were investigated. The results demonstrated that the initial pH during fermentation was acidic (pH 3 and 5), which was conducive to the removal of six eARGs and seven iARGs . Similarly, intracellular and extracellular MGEs were effectively reduced with an initial pH of 3 and 5. The abundance of MGEs and four ARGs were enriched with an initial pH of 7 and 11. The redundancy analysis (RDA) indicated that pH values and microbial communities were correlated with the change of ARGs . Acidic conditions can significantly reduce the diversity and abundance of the microbial community, resulting in the elimination of MEGs and ARGs. These findings are critical for risk assessment and management of ARGs. © 2022, The Authors. All rights reserved.

关键词： Microorganisms

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