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Inhibitory Mechanism of Cr (Vi) or Fe (Iii) Complexation on the Photodegradation of Nitrogen-Doped Dissolved Black Carbon for Tetracycline: The Reducing Steady-state Concentration of 3ndbc* and 1o2

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SSRN 2023年

作者： Guo, Yong Chen, Mengxia Chen, Ting Guo, Ying You, Guoxiang Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing210093 China Key Laboratory of Environmental Engineering of Jiangsu Province Jiangsu Provincial Academy of Environmental Science Nanjing210036 China State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing210023 China

Dissolved black carbon (DBC) is known for strong environmental mobility and photodegradation to contaminants. But studies on the impact of metal ions for nitrogen-doped DBC (NDBC) photodegradation of antibiotics are barely found. Herein, the photodegradation performance of tetracycline (TC) induced by NDBC involving Cr (VI) or Fe (III) was explored. Adding Cr (VI) or Fe (III) reduces the photodegradation performance of NDBC for TC. Detailedly, the photodegradation efficiency of NDBC for TC is 79%, which decreases to 37% when Cr (VI) exists, and that decreases slightly to 53% when Fe (III) exists. Possible reasons are that Cr (VI) has a higher complexation ability with NDBC than that of Fe (III) according to the FL and EEMs FL spectra of Cr (VI) or Fe (III) with NDBC, which leads to the reduction of the major reactive species (RS) (3NDBC* and 1O2) during the photodegradation of NDBC for TC. Finally, adding Cr (VI) decreases the formation rate of 3NDBC* and 1O2 more markedly than Fe (III). This paper provides a deeper insight into the fate of DBC, metal ions, and antibiotics in the actual water body. © 2023, The Authors. All rights reserved.

关键词： Metal ions

Inhibitory Mechanism of Cr (Vi) or Fe (Iii) Complexation on Nitrogen-Doped Dissolved Black Carbon Photodegradation of Tetracycline: The Reducing Steady-state Concentration of 3ndbc* and 1o2

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SSRN 2023年

作者： Guo, Yong Chen, Mengxia You, Guoxiang Chen, Ting Guo, Ying Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing210093 China Key Laboratory of Environmental Engineering of Jiangsu Province Jiangsu Provincial Academy of Environmental Science Nanjing210036 China State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing210023 China

Dissolved black carbon (DBC) is known for strong environmental mobility and photodegradation to contaminants. But studies on the impact of metal ions for nitrogen-doped DBC (NDBC) photodegradation of antibiotics are barely found. Herein, the photodegradation performance of tetracycline (TC) induced by NDBC involving Cr (VI) or Fe (III) was explored. Adding Cr (VI) or Fe (III) reduces the photodegradation performance of NDBC for TC. Detailedly, the photodegradation efficiency of NDBC for TC is 79%, which decreases to 37% when Cr (VI) exists, and that decreases slightly to 53% when Fe (III) exists. Possible reasons are that Cr (VI) has a higher complexation ability with NDBC than that of Fe (III) according to the FL and EEMs FL spectra of Cr (VI) or Fe (III) with NDBC, which leads to the reduction of the major reactive species (RS) (3NDBC* and 1O2) during the photodegradation of NDBC for TC. Finally, adding Cr (VI) decreases the formation rate of 3NDBC* and 1O2 more markedly than Fe (III). This paper provides a deeper insight into the fate of DBC, metal ions, and antibiotics in the water body. © 2023, The Authors. All rights reserved.

关键词： Metal ions

Coordination-Driven Synthesis of Mofs-Based Facilitated Transport Hybrid Membranes for Co2 Separation

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SSRN 2023年

作者： Li, Boyu Liu, Jiaxiang He, Xuanting Mao, Shun Tao, Wenquan Li, Zhuo Hong, Yuexian State Key Laboratory of Pollution Control and Resource Reuse College of Environment Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Key Laboratory for Polymeric Composite and Functional Materials Ministry of Education School of Chemistry State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University Guangzhou510275 China Xi’an Jiaotong University China

MOFs-based facilitated transport hybrid membranes (FTHMs) have shown their great potential in CO2-selective gas separation. However, rational membrane fabrication by distributing evenly and introducing functional groups in MOFs-based facilitated transport hybrid membrane is crucial but challenging. We herein report a facile coordination-driven approach to realizing the integration of MOF onto a polymetric matrix by introducing the polyaniline (PANI) as a binder as well as a filler disperser through Cu(II)-N coordination interaction. The resulting facilitated membrane exhibited synergetic channels to process CO2 facilitated transport due to the CO2-philic nature of PANI and MOFs with low-density pore blockage observed. The even distribution of well-dispersed MOFs nanoparticles upon PANI is realized through coordination interaction between the metal center and amino and imine groups in PANI. Moreover, PANI is highly compatible with the polymetric matrix by forming hydrogen bonds, as verified by experimental characterization and molecular dynamics (MD) simulations. The resulting FTHMs exhibit a simultaneous enhancement of individual-gas permeance (676.6 GPU) and CO2/N2 ideal selectivity (28.3), as well as enhanced decomposition temperature up to 474°C and lasting sustainability over 72 days (1728 hours). The coordination-driven membrane fabrication paves a new and promising way for designing stable, uniform, and longevity FTHMs, thus offering a potential facile route to fabricate high-performance FTHMs for CO2/N2 separation. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

An Enhanced Particle Swarm Optimization with Levy Flight for RBF Neural Network in Typical Karst Area, South China

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An Enhanced Particle Swarm Optimization with Levy Flight for...

International Conference on Intelligent and Fuzzy Systems, INFUS 2020

作者： Cao, Zhangjun Wang, Dong Wang, Lachun Key Laboratory of Surficial Geochemistry Ministry of Education Department of Hydrosciences School of Earth Sciences and Engineering State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing China School of Geographic and Oceanographic Sciences Nanjing University Nanjing China

ISBN: (纸本)9783030511555

This paper applied an enhanced particle swarm optimization (PSO) technique with levy flight algorithm for training the radial basis function (RBF) neural network to forecast the data of runoff in the Houzhaihe River basin, a typical karst area in Guizhou Province, southwest China. The karst aquifer system is a highly nonlinear and complex system due to its unique aqueous medium, the complexity of its hydrogeological conditions makes the traditional hydrological model research results unsatisfactory, and the establishment of a physical distributed model based on hydrological mechanism requires a large number of hydrogeological parameters, which are often unavailable in karst areas. Radial Basis Function (RBF) neural network has been widely used in various fields because of its simple structure, high-speed calculation and ability to approximate any nonlinear function. Based on the RBF neural network, this paper established a time series prediction model for typical karst regions. In order to improve the performance of RBF network model, we applied an enhanced particle swarm optimization with levy flight in this research. The results show the proposed enhanced RBF model performs much better than the one without improvement by the levy flight. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Radial basis function networks

Reconceptualization of the Mechanism of Thermal Hydrolysis Pretreatment to Enhance the Anaerobic Conversion of Sludge Organic Nitrogen: Decisive Role of Organic Nitrogen Occurrence

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SSRN 2023年

作者： Gao, Jun Li, Lei Yuan, Shijie Sun, Jing Chen, Sisi Dong, Bin State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China YANGTZE Eco-Environment Engineering Research Center China Three Gorges Corporation Beijing China

The occurrence state of organic nitrogen (ON) is the key to affect anaerobic biotransformation of sludge. ON in sludge was chemically classified as PA (easily accessible part), PB (moderately accessible) and PC (hardly accessible) according to the modified CNCPS method. The components of them were analyzed by PY-GCMS, and it was identified that PA was extracellular amino acids, peptides and proteins;PB was genetic material, cell wall peptidoglycans and intracellular proteins;PC was ON that cross-linked with complex macromolecules. The conversion characteristics of PA, PB and PC in sludge and their relationship with anaerobic digestion (AD) performance were investigated after thermal hydrolysis pretreatment (THP) at different temperatures (100-180°C). With the increase of THP temperature, the hydrolysis of PA and the conversion of PB to PA were promoted. At 180-THP, part of PA was converted to PC due to thermochemical reactions. In the fast degradation stage of AD of ON (ON-fast), PA is the main component of degradation;while in the slow degradation stage (ON-slow), the degradation of ON is mainly dominated by PB. Therefore, THP can significantly increase the proportion of ON-fast and reduce the ON fraction in the digestate (ON-hard). Moreover, PA and PB, rather than PC, were identified as dominant in ON-hard with or without THP for the first time, overturning the traditional view (remaining ON after AD was that cross-linked with complex macromolecules). This is due to that PA and PB are the main ON that make up microbial cells. The findings upgraded our perspective on conversion of ON of sludge during AD and inspire the shifted focus from "degrading PC" to "PC accumulation" for later use, through targeted enhanced PA degradation. © 2023, The Authors. All rights reserved.

关键词： Degradation

Gamma irradiation induced degradation of organic pollutants: Recent advances and future perspective

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Chemosphere 2024年 352卷 141437页

作者： Egerić, Marija Matović, Ljiljana Savić, Marjetka Stanković, Srboljub Wu, Yi-nan Li, Fengting Vujasin, Radojka Vinča Institute of Nuclear Sciences – National Institute of the Republic of Serbia University of Belgrade Belgrade Serbia Center of Excellence "CEXTREME LAB" Vinča Institute of Nuclear Sciences – National Institute of the Republic of Serbia University of Belgrade Belgrade Serbia College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Different organic compounds in aquatic bodies have been recognized as an emerging issue in Environmental Chemistry. The gamma irradiation technique, as one of the advanced oxidation techniques, has been widely investigated in past decades as a technique for the degradation of organic molecules, such as dyes, pesticides, and pharmaceuticals, which show high persistence to degradation. This review gives an overview of what has been achieved so far using gamma irradiation for different organic compound degradations giving an explanation of the mechanisms of degradations as well as the corresponding limitations and drawbacks, and the answer to why this technique has not yet widely come to life. Also, a new approach, recently presented in the literature, regards coupling gamma irradiation with other techniques and materials, as the latest trend. A critical evaluation of the most recent advances achieved by coupling gamma irradiation with other methods and/or materials, as well as describing the reaction mechanisms of coupling, that is, additional destabilization of molecules achieved by coupling, emphasizing the advantages of the newly proposed approach. Finally, it was concluded what are the perspectives and future directions towards its commercialization since this technique can contribute to waste minimization i.e. not waste transfer to other media. Summarizing and generalization the model of radiolytic degradation with and without coupling with other techniques can further guide designing a new modular, mobile method that will satisfy all the needs for its wide commercial application. © 2024 Elsevier Ltd

关键词： Organic pollutants

Sulfurization of Microplastics Alters Their Redox Property and Efficiency in Mediating Arsenite Oxidation

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SSRN 2023年

作者： Chen, Lin Fan, Tingting Yang, Min Si, Dunfeng Wu, Haotian Wu, Song Xu, Jian Zhou, Dongmei Ministry of Ecology and Environment of the People’s Republic of China Nanjing Institute of Environmental Sciences Nanjing210042 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Microplastics have been widely detected in soil, aquatic, and marine environment. The environmental weathering of microplastics by various types of oxidants in the oxic environment and their interaction with environmental contaminants have drawn numerous scientific attentions. However, the environmental fate of microplastics under a reducing environment has been largely unresolved. Herein, the change of physicochemical and redox properties of microplastics during the weathering under a sulfate-reducing environment and the interaction with arsenite were addressed. The sulfurization of PF microplastics under a sulfate-reducing environment generated smooth and porous particles with the induction of organic S species. Multiple spectroscopic results demonstrated thioether and thiophene groups were formed by the substitute removal of O-containing functional groups. The reduction of carbonyl groups and the oxidation of phenolic hydroxyl groups happened during the sulfurization process, which led to the formation of semiquinone radicals but the reduction of electron donating capacity. Producing hydrogen peroxides by electron-donating phenol groups and semiquinone radicals and the direct semiquinone radicals oxidation could mediate arsenite oxidation. The sulfurization of microplastics reduced arsenite oxidation efficiency due to the decrease in electron donating capacity. The findings of this study help to understand the fate of microplastics in anoxic soil and sediment environment. © 2023, The Authors. All rights reserved.

关键词： Efficiency

Prevalence of Opportunistic Pathogens and Diversity of Microbial Communities in the Water System of a Pulmonary Hospital

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Biomedical and Environmental Sciences 2020年第4期33卷 248-259页

作者： TANG Wei MAO Yu LI Qiu Yan MENG Die CHEN Ling WANG Hong ZHU Ren ZHANG Wei Xian State Key Laboratory for Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Department of In fection Control Shanghai Pulmonary HospitalTongji UniversityShanghai 200433China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Objective Our objective was to investigate the occurrence of opportunistic pathogens and characterize the bacterial community structures in the water system of a pulmonary *** The water samples were collected from automatic and manual faucets in the consulting room,treatment room,dressing room,respiratory ward,and other non-medical rooms in three buildings of the *** polymerase chain reaction was used to quantify the load of several waterborne opportunistic pathogens and related microorganisms,including Legionella spp.,Mycobacterium spp.,and *** sequencing targeting 16 S r RNA genes was performed to profile bacterial *** The occurrence rates of Legionella spp.,Mycobacterium spp.,and *** were 100%,100%,and 76%,respectively in all *** occurrence rates of *** were observed in the outpatient service building(building 1,91.7%)and respiration department and wards(building 2,80%)than in the office building(building 3),where no *** was *** were more abundant in automatic faucets(average 2.21×10~4 gene copies/L)than in manual faucets(average 1.03×10~4 gene copies/m L)(P<0.01).Proteobacteria,Actinobacteria,Bacteroidetes,Cyanobacteria,Firmicutes,and Acidobacteria were the dominant bacterial *** residuals,nitrate,and temperature were found to be the key environmental factors driving microbial community structure shifts in water *** This study revealed a high level of colonization of water faucets by opportunistic pathogens and provided insight into the characteristics of microbial communities in a hospital water system and approaches to reduce risks of microbial contamination.

关键词： Opportunistic pathogen Microbial community Hospital water system Mycobacterium avium

Synthesis of Attaining Sustainable Development Goal 6.5: A Case Study of Mano River

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Journal of Geoscience and Environment Protection 2021年第6期9卷 100-119页

作者： Mohamed Yateh George Lartey-Young Harrison Henry Boying Fengting Li College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Study Tongji University Shanghai China

The Mano River is a transboundary river that runs through Côte d’Ivoire, Liberia, Guinea, and Sierra Leone. According to a 2018 United Nation report on Sustainable Development Goal (SDG) 6.5, which aims to improve the adoption of cohesive water resource management by 2030;the impact of this goal on the Mano River management is minimal. The research summarizes previous studies using an integrative literature review method, drawing general conclusions and identifying unsolved problems with respect to water resources management. The research finding demonstrated that existing water stress and poor management as exacerbated by socioeconomic practices in the region are the major threats to achieve SDG 6.5. As a result of these activities, long-term management of the river basins has become extremely difficult. The research informs a discussion to achieve cooperative water resource management, which is best achieved by shared collaboration and shared interests as described by SDG 6.5.

关键词： Côte d’Ivoire Guinea Liberia Mano River Sierra Leone Sustainable Development Goal 6.5 Water resource Management