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SSRN 2023年

作者： Gao, Han Li, Huixin Zhou, Xinwei Wei, Jing Qu, Xiaolei Long, Tao State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment of China Jiangsu Nanjing210042 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212100 China

Lead chromate pigments are commonly used yellow inorganic pigments, which can pose environmental risks as they contain toxic heavy metals lead and chromium. Low molecular weight organic acids (LMWOAs), as widespread natural organic matter, affect the photodissolution of lead chromate pigment in water systems. In this work, the role of LMWOAs in the photodissolution of commercial lead chromate pigment was investigated. The pigment underwent significant photodissolution under simulated sunlight exposure with LMWOAs, and subsequently released Cr(III) and Pb(II). Meanwhile, the Cr(VI) content decreased significantly by irradiation time, attributing to the reduction of Cr(VI) to Cr(III). The photodissolution of lead chromate pigment was basically positively related to the total number of hydroxyl and carboxyl groups in LMWOAs. The LMWOAs promoted photodissolution of the pigment by improving the electron-hole separation. The LMWOAs with lower ionization potential and higher energy of the highest occupied molecular orbital had stronger electron-donating power, which thus was favorable to Cr(VI) reduction and pigment photodissolution. This study revealed the photodissolution mechanism of lead chromate pigment mediated by LMWOAs with different molecular structures, which is helpful for understanding the environmental behavior of lead chrome yellow pigment in complex water environment. © 2023, The Authors. All rights reserved.

关键词： Lead compounds

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Accuracy Assessment and Inconsistency Diagnosis of 30-Meter Land Cover Datasets in China

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SSRN 2024年

作者： Xu, Xiaolin Li, Dan D. Liu, Hongxi Zhao, Guang Cui, Baoshan Yi, Yujun Yang, Wei Du, Jizeng School of Environment Beijing Normal University State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing100875 China Advanced Institute of Natural Sciences Beijing Normal University Zhuhai Campus Zhuhai519087 China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

Accurate and detailed land cover information is fundamental for environmental studies, including regional climate change, sustainable development, and land resource management. With higher resolution and longer records, land cover datasets with a 30-meter resolution are widely used to evaluate land cover changes and consequent impacts on carbon storage, land-atmosphere energy balance, and water cycle processes. However, existing data products employ different classification methods, leading to substantial classification inconsistency and thus reducing the confidence of related studies. Here, we compared four mainstream land cover products in China, including GLC_FCS30, CLCD, Globeland30, and CNLUCC. The result shows that only 50.4% of the classification results were consistent across the four datasets. The differences between pairs of datasets ranged from 21.10% to 37.53%, with most inconsistency occurring in transitional zones among land cover types and regions with complex terrain or severe landscape fragmentation. Based on accuracy evaluation, CLCD is significantly more accurate than the other products, with an overall accuracy reaching 86.98%, followed by CNLUCC (with an overall accuracy of 81.38%) and GLC_FCS30 (77.83%). The Globeland30 had a lowest accuracy (75.24%), primarily due to misclassification between cropland and forests. Misclassification diagnoses revealed that overlapping NDVI values among land cover types contributed significantly to misclassifications, followed by slope, cloud cover, and landscape fragmentation, which affected satellite observation angles, data availability, and mixed pixels. Automated classification methods using the random forest algorithm can perform better than those that depend on traditional hunam-machine interactive interpretation or object-based approaches. However, their classification accuracy depends more on the quality of training samples and feature variables. This study quantitatively supports the selection and opti

关键词： Sustainable development

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Comparison of Three Source Apportionment Methods Based on Observed and Initial Hcho in Taiyuan, China

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SSRN 2023年

作者： Cui, Yang Hua, Jingya He, Qiusheng Guo, Lili Wang, Yonghong Wang, Xinming School of Environment and Resources Taiyuan University of Science and Technology Taiyuan030024 China Taiyuan University of Science and Technology China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Guangzhou510640 China

Identifying the sources of formaldehyde (HCHO) is the key to reducing the pollution of HCHO and ozone (O3) on the ground level. Using the same data sets applied to the positive matrix factorization (PMF) model by (Hua et al. 2023), the initial concentrations of the HCHO were estimated using the photochemical age and the sources of observed and initial HCHO were apportioned based on multiple linear regression (MLR) and photochemical age-based parameterization (PCAP) method. The results suggested that the source of initial HCHO could better reflect its contribution. The secondary formation contributed to 49.3-69.1% of initial HCHO at four sites in Taiyuan based on MLR, which were higher (7.4-36.2%) than the contributions of secondary formation from observed HCHO. The HCHO was mainly affected by anthropogenic secondary (10.8-34.4%) and background sources (17.4-78.7%) based on PCAP method. We compared the results of HCHO sources from MLR, PCAP and PMF models under the condition of photochemical loss. There was good agreement among the emission ratio of HCHO based on acetylene obtained by different methods at four sites. The correlation analysis of different source apportionment methods illustrated that primary emissions from the PCAP and the MLR model had greatest correlation (0.22-0.60). The secondary formation from PMF model and the MLR model showed good correlations at all four sites, with R values ranging from 0.42 to 0.83. The HCHO peak of diurnal variation simulated by the MLR appeared late compared with other methods, and the difference of daily variation of HCHO from the PMF model was significantly higher than that of PCAP and MLR. The overlapping conclusions of different source apportionment method should be seriously considered and used to guide efforts in improving air quality. © 2023, The Authors. All rights reserved.

关键词： Multiple linear regression

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Influence of pore size and membrane surface properties on arsenic removal by nanofiltration membranes

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Frontiers of environmental Science & Engineering 2019年第2期13卷 55-62页

作者： Nathalie Tanne Rui Xu Mingyue Zhou Pan Zhang Xiaomao Wang Xianghua Wen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Nanofiltration(NF)has a great potential in removing arsenate from contaminated *** performance including arsenate rejection,water permeability and resistance to fouling could however differ substantially among NF *** study was conducted to investigate the influence of membrane pore size and surface properties on these aspects of membrane *** fullyaromatic NF membranes with different physicochemical properties were adopted for this *** results showed that surface charge,hydrophobicity,roughness and pore size could affect water permeability and/or arsenate rejection considerably.A more negative surface charge was desirable to enhance arsenate rejection ***90 and a non-commercialized membrane(M#1)demonstrated the best performance in terms of arsenate rejection and water *** M#1 membrane showed less membrane fouling than NF90 when used for filtration of real arsenic-containing *** was mainly due to its distinct chemical composition and surface properties.A severe membrane fouling could lead to a substantial reduction of arsenic *** M#1 membrane showed the best performance,which indicated that membrane modification could indeed enhance the overall membrane performance for water treatment.

关键词： Arsenate Nanofiltration Drinking water Membrane property Membrane fouling

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Interactions and Mechanism between Microplastics and Dissolved Organic Matter: The key Influence of Different Microplastics

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SSRN 2023年

作者： Wang, Xinglei Wang, Xiaoxiao Zhu, Weimin Ding, Ling Ouyang, Zhuozhi Liu, Peng Liang, Xujun Wu, Renren Guo, Xuetao College of Natural Resources and Environment Northwest A&F University Shaanxi Yangling712100 China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences MEE Guangzhou510655 China Key Laboratory of Plant Nutrition The Agro-environment in Northwest China Ministry of Agriculture Shaanxi Yangling712100 China

As new pollutants, microplastics (MPs) can interact with dissolved organic matter (DOM), a common component found in the environment. However, the effect of MPs types on its interaction with DOM has not been systematically studied. Therefore, the binding properties of different types of MPs with DOM were explored in this study. The results showed that polypropylene (PP) and polyethylene (PE) have higher adsorption affinity for DOM than polystyrene (PS) and polyvinyl chloride (PVC). The interaction between MPs and DOM conforms to the pseudo-first-order model and Freundlich model (except PS). The interaction mechanism between MPs types tested and DOM considered to be different. PP, PE and PS interacted with the aromatic structure of DOM and were entrapped in the DOM polymers by the carboxyl groups and C=O bonds, resulting in a highly conjugated co-polymer, while PVC may be conjugated to DOM through hydrophobic interactions. This research will help to enhance our comprehension of the environmental behavior of MPs and their interaction with the DOM specifically. © 2023, The Authors. All rights reserved.

关键词： Hydrophobicity

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Catalytic Ozonation of an Imidazole Ionic Liquid Via Fe3o4-Zno Nanocomposites: Performance, Products and Reaction Mechanism

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SSRN 2022年

作者： Tian, Jie Wei, Junyan Sun, Ping Liang, Yeping Guo, Ruixue Li, Beibei Qu, Ruijuan Zhou, Dongmei Wang, Zunyao State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

This study aimed to investigate the catalytic performance of Fe3O4-ZnO in the ozonation of 1-hexyl-3-methyl imidazolium bromide ([HMIM]Br). The Fe3O4-ZnO composite was prepared by a quick and convenient two-step coprecipitation method, and the optimum mass ratio of Fe3O4:ZnO was determined to be 1:8. The degradation efficiency of [HMIM]Br reached 96% in five minutes in catalytic ozonation with the optimum dosage of Fe3O4-ZnO composite (0.25 g/L), and the pseudo-first-order rate constant increased by a factor of approximately 1.5. Radical scavenging and EPR experiments showed that hydroxyl radicals (•OH), superoxide radicals (O2•-) and singlet oxygen (1O2) were the main active species. Meanwhile, product identification showed that [HMIM]Br degradation mainly included hydroxylation, imidazole ring cleavage and bond cleavage. The efficiency, reusability, and stability experiments suggested that the developed catalyst, Fe3O4-ZnO composite, had promising prospects in catalytic ozonation. © 2022, The Authors. All rights reserved.

关键词： Magnetite

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Recent advances in catalytic decomposition of ozone

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Journal of environmental Sciences 2020年第8期32卷 14-31页

作者： Xiaotong Li Jinzhu Ma Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China

Ozone(O3),as a harmful air pollutant,has been of wide ***,efficient,and economical O3 removal methods urgently need to be *** decomposition is the most promising method for O3 removal,especially at room temperature or even subzero *** efforts have been made to develop high-efficiency catalysts for O3 decomposition that can operate at low temperatures,high space velocity and high ***,this review describes the general reaction mechanism of O3 decomposition on noble metal and transition metal oxide ***,progress on the O3 decomposition performance of various catalysts in the past 30 years is summarized in *** main focus is the O3 decomposition performance of manganese oxides,which are divided into supported manganese oxides and non-supported manganese *** to improve the activity,stability,and humidity resistance of manganese oxide catalysts for O3 decomposition are also *** deactivation mechanisms of manganese oxides under dry and humid conditions are *** O3 decomposition performance of monolithic catalysts is also summarized from the perspective of industrial ***,the future development directions and prospects of O3 catalytic decomposition technology are put forward.

关键词： Ozone Catalysis Manganese oxides Deactivation mechanism

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Degradation of Bisphonel Af(Bpaf) by Zero-Valent Iron Activated Persulfate: Kinetics, Mechanisms, Theoretical Calculations, and Effect of Co-Existing Chloride

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SSRN 2022年

作者： Qin, Cheng Qi, Yumeng Teng, Xiaolei Qu, Ruijuan State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

The removal of Bisphonel AF (BPAF) by zero-valent iron activated persulfate (Fe 0 /PS) system was systematically evaluated in this work. 30.0 μM BPAF was removed by 94.4% in 60 min of treatment under optimal conditions of pH = 3.0 and [PS] = [Fe 0 ] = 3.0 mM. Cl - significantly accelerated the removal of BPAF, resulting from accelerated Fe 2+ release and reactive chlorine species (RCS) formation. Liquid chromatography-time-of-flight-mass spectrometry identified thirteen degradation products, and bond breaking, coupling reactions, hydroxylation and sulfate addition were considered as the major transformation pathways. When Cl - was present, six new chlorinated byproducts were also generated. Based on density functional theory (DFT) calculations, the occurrence of radical addition reactions was verified and the preferential reaction channels were determined. Significantly BPAF degradation products were less toxic, according to toxicity assessment by the ECOSAR program. Moreover, a high removal efficiency of BPAF (> 90%) was also obtained in the three actual water matrixes. The present work demonstrates the feasibility of Fe 0 /PS system for treating BPAF, which could also provide new insights into the influence of coexisting Cl - on the environmental fate of organic pollutants in sulfate radicals based advanced oxidation processes. © 2022, The Authors. All rights reserved.

关键词： Iron compounds

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Catalytic Ozonation of an Imidazole Ionic Liquid Via Fe3o4-Zno Nanocomposites: Performance, Products and Reaction Mechanism

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SSRN 2022年

关键词： Magnetite

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Single Viable Bioaerosol Particle Discerning Using Naked Eye Assisted with Laser Trapping and Microwaving

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SSRN 2022年

作者： Li, Xinyue Yao, Maosheng State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China

Viable microbial aerosol detection remains a grant challenge. Here, we pioneered a new system that integrates laser trapping and microwave irradiation for online discerning of single viable microbial aerosol particle through naked eye. To test the system, three fungal species Aspergillus niger , Aspergillus oryzae , and Trichoderma harzianum and three non-biological particles such as MnO 2 , active carbon, and Fe 3 O 4 suspended and laser trapped in the air inside a house-made glass cube. When microwave irradiated, viable fungal spores, containing microwave energy absorbing molecules such as water, were observed to rapidly escape the trapping and even burst with abrupt morphology changes with a longer irradiation time. In contrast, those non-biological particles were shown to behave differently with little morphology change without the cell burst. For all particles tested, microwave irradiation resulted in particle movement within the trapping region, and a particle trapping was then re-established in a new location. Depending on particle type and irradiation time, light scattering properties also differ between biological and non-biological particles when irradiated. Terminating the microwave irradiation was observed to render the non-biological particles to return where they are being laser trapped. Using the developed system, we have demonstrated the viable microbial aerosol detection using naked eye by simply observing the morphology changes and cell burst upon the laser trapping and microwave irradiation. A portable version of the system was further developed and successfully tested for discerning viable cells from non-viable ones. Further efforts on this development could lead to a new generation of bioaerosol detection strategy. © 2022, The Authors. All rights reserved.

关键词： Microwave irradiation

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