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SSRN 2024年

作者： Zhang, Zengshuai Ni, Jun Sheng, Kuang Yang, Kunlun Gu, Peng Ren, Xueli Miao, Hengfeng School of Environmental and Ecology Jiangnan University Wuxi214122 China Jiangsu Key Laboratory of Anaerobic Biotechnology Jiangnan University Wuxi214122 China Jiangsu Engineering Laboratory of Biomass Energy and Carbon Reduction Technology Jiangnan University Wuxi214122 China Water Treatment Technology and Material Innovation Center Suzhou University of Science and Technology Suzhou215009 China

As the impurity of syngas, the adverse effect of hydrogen sulfide (H2S) on syngas fermentation was revealed, but the inhibitory threshold and mechanism was not clear. Here in, the present study systematically investigated the insight mechanism of H2S on syngas fermentation pathways via evaluating the key enzymatic activities, genes expression and functional microorganisms. Results showed that the inhibitory threshold of H2S on syngas fermentation was 200 ppm, reflected by a significant decrease of syngas consumption rate and volatile fatty acids (VFAs) production. However, low concentration of H2S (20-100 ppm) had stimulation on syngas fermentation and the highest of VFAs concentration of 2.8 g/L was observed at 50 ppm H2S. Low H2S concentrations improved the percent of lately apoptotic cells, but 200 ppm H2S led to most of cells at early apoptotic status. At the presence of H2S, the enzymatic activities (i.e., CODH and FDH) and functional genes (i.e., fhs and acsE) encoding the methyl branch was significantly decreased, while the expression of genes encoding the carbonyl branch (i.e., acsA) up-regulated. The down-regulated of genes encoding the acetogenic pathway (i.e., codh) proved the enhancement of reductive acetate production pathway. Moreover, the functional bacteria of Terrisporobacter and Acetobacter that involved in the methyl branch, showed significant decrease at the presence of H2S. Hence, H2S stress led to the changes of metabolic pathway from methyl branch to carbonyl branch. The proliferation of sulfur metabolizer (i.e., Mesotoga and SBR1031) explained the improvement of VFAs production at low H2S concentrations. © 2024, The Authors. All rights reserved.

关键词： Sulfur compounds

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High Temperature Properties of Basalt Fiber Reinforced Concrete Experienced Sulfate Erosion

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SSRN 2023年

作者： Zhao, Zixian Han, Fei Wang, Shouxing Xu, Weihao Lu, Limin State Key Laboratory for Geomechanics & Deep Underground Engineering China University of Mining & Technology Xuzhou221116 China Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering China University of Mining & Technology Jiangsu Xuzhou221116 China China Construction Science and Industry Corporation Ltd Shenzhen China School of Mechanics and civil engineering China University of Mining & Technology Jiangsu Xuzhou221116 China

Concrete structures in coastal areas and saline soil areas suffer sulfate corrosion in their whole life cycle. When coupled with fire damage, which is a high-risk disaster for reinforced concrete buildings, it will be a complex issue of structural safety. For basalt fiber reinforced concrete (BFRC), the high temperature properties after experienced sulfate erosion are still not clear. To solve this problem, fast sulfate attack test and heating tests were carried out on both ordinary concrete and BFRC. The sulfate erosion depths of different erosion duration and the mechanical properties of concrete after the sulfate erosion and high temperature coupling action were recorded and discussed. The results proof that a proper mix proportion of basalt fiber can significantly delay the sulfate erosion process in concrete, and improve the mechanical properties of the concrete both after sulfate erosion and after high temperatures. © 2023, The Authors. All rights reserved.

关键词： Reinforced concrete

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Facile Construction of a Dual-Z-Scheme Tio2/Cati4o9/Catio3 Heterojunction Photocatalyst with Superior Photocatalytic Performance for Hydrogen Production and Cr(Vi) Reduction

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SSRN 2023年

作者： Li, Feng Wu, Zhen Liu, Xingqiang Yu, Shuyuan Wei, Longfu Yu, Changlin School of Chemical Engineering Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control Key Laboratory of Petrochemical Pollution Control of Guangdong Higher Education Institutes Guangdong University of Petrochemical Technology Guangdong Maoming525000 China School of Chemistry and Chemical Engineering South China University of Technology Guangzhou510000 China School of Environmental Science and Engineering Key Laboratory of Estuarine Ecological Security and Environmental Health Xiamen University Tan Kah Kee College Fujian Zhangzhou363105 China Shenzhen Customs Industrial Product Testing Technology Center Guangdong Shenzhen518026 China

Ti-based semiconductor is the eco-friendly materials. Here, using n-tetrabutyl titanate and calcium acetate as raw materials, a dual-Z-scheme TiO2/CaTi4O9/CaTiO3 heterojunction was facilely constructedvia the solvothermal combination with calcination route. The obtained samples were intensively characterized by some physicochemical methods such as TG, XRD, FT-IR, SEM, TEM, XPS, UV-Vis DRS, PL, N2 physisorption-desorption and electrochemical test. The optimum TiO2/CaTi4O9/CaTiO3 photocatalyst fabricated at solvothermal temperature of 160 ℃ and calcination temperature of 700℃ shows high efficiency for H2 production, which was 11, 5 and 1.6 times higher than that of rutile-phase TiO2, CaTiO3 and commercial P25(TiO2), respectively. And the Cr(VI) reduction rate over TiO2/CaTi4O9/CaTiO3 was 3.3, 5.2 and 3.1 times higher than those of rutile-phase TiO2, CaTiO3 and commercial P25, respectively. The superior photocatalytic performance is attributed to the strong redox ability of carriers excited by wide band gap semiconductors and the unique dual-Z-scheme which largely promotes carrier separation. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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Spatial Confinement Effect of Mof Derived Carbon Nanoreactor: The Crucial Role of Micropores in Selective Capture of Peroxymonosulfate in Aops-Based Process

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SSRN 2022年

作者： Xiaojie, Qiu Zhao, Yingxin Li, Chenxi Song, Yanxing Emmanuel, Mutabazi Pang, Guowei Yang, Shengjiong School of Environmental Science and Engineering Tianjin University Tianjin300350 China Key Laboratory of Environmental Engineering Xi'an University of Architecture and Technology No.13 Yanta Road Shaanxi Xi’an710055 China

Carbon-based catalyst activated peroxymonosulfate process suffers from the decay of catalytic activity due to the pore-filling of intermediates. Controllable regulation of pore structure might be a feasible way to selectively capture PMS and prevent organics from entering pores. Herein, a series of carbocatalysts with tunable micropore abundance were synthesized for boosted PMS activation with negligible attenuation within consecutive runs. The results showed that catalyst with higher micropore abundance exhibited efficient kinetic performance (2.38 min-1). DFT calculation demonstrated that the spatial micropore-confined effect strongly elevated the interaction between PMS and catalyst, which accelerated acetaminophen degradation through enhanced van der Waals attraction toward PMS. The selective capture of PMS was proved to be responsible for the negligible attenuation of catalytic activity. Reactive oxidation species were evidenced by quenching experiment and EPR analysis. The findings proposed a brand new insight in enhancing the reusability of carbon-based catalyst through pore-structure tuning for PMS activation. © 2022, The Authors. All rights reserved.

关键词： Catalyst activity

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Radioisotope Identification with Scintillation Detector Based on Artificial Neural Networks using Simulated Training Data

Radioisotope Identification with Scintillation Detector Base...

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2020 IEEE Nuclear science Symposium and Medical Imaging Conference, NSS/MIC 2020

作者： Fan, Peng Feng, Siliang Zhu, Chenglin Zhao, Chunqing Ding, Yigang Shen, Zicai Liu, Yaqiang Ma, Tianyu Xia, Yan National key Laboratory of Science and Technology on Reliability and Environmental Engineering Beijing100094 China Beijing Institute of Spacecraft Environment Engineering Beijing100094 China Department of Engineering Physics Tsinghua University Beijing100084 China

ISBN: (纸本)9781728176932

Artificial neural networks (ANN) based on learning the features of the entire measured gamma energy spectrum has been used for radioisotope identification and proved promising especially for gamma-ray spectroscopy with low energy resolution. The implementation of ANN method, however, requires tedious experimental measurement process in generation of training data for various radioisotopes. In this work, we propose an ANN-based radioisotope identification method with simulated training data. Gamma energy spectra of 27 different radioisotopes were generated with Monte Carlo simulation. A detector energy response model was proposed to match the energy spectra generated from simulation and measured from experiment, thus "pseudo" measured energy spectra of various radioisotopes transformed from simulation can be used for ANN training, which eliminates the tedious experimental measurement process for training data generation. To reduce the complexity of the training process, the principal component analysis (PCA) method was used for dimension reduction of the input energy spectra in ANN and the channel number of the energy spectra was reduced from 2000 to 50. The trained ANN was further used to identify experimentally measured gamma energy spectra of various radioisotopes including 60Co, 137Cs, 18F, 131I, 226Ra and 232Th at 103, 104 and 105 count levels. In single isotope identification test, with increased count level, higher correct identification rate is achieved and at 105 count level, all the isotopes are correctly identified for all the samples. In mixed isotope identification test, at 105 count level, all the radioisotope combinations can be identified with a correct identification rate larger than 98%, which demonstrates the feasibility and accuracy of the ANN method. To conclude, the proposed ANN method with simulated training data features good radioisotope identification capability with greatly simplified training data generation process and is feasible for gam

关键词： Neural networks

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Impact analysis of hydraulic loading rate and antibiotics on hybrid constructed wetland systems: Insight into the response to decontamination performance and environmental-associated microbiota

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Chemosphere 2024年 347卷 140678页

作者： Shi, Baoshan Cheng, Xiangju Zhu, Dantong Jiang, Shenqiong Chen, Hongzhan Zhou, Zhihong Xie, Jun Jiang, Yuheng Liu, Chunsheng Guo, Heyi School of Civil Engineering and Transportation South China University of Technology Guangzhou510641 China State Key Laboratory of Subtropical Building and Urban Science South China University of Technology Guangzhou510640 China Guangzhou Ecological and Environmental Monitoring Center of Guangdong Province Guangzhou510030 China Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation Pearl River Fisheries Research Institute Chinese Academy of Fishery Sciences Guangzhou510380 China

Hybrid constructed wetlands (HCWs) are a promising solution for water ecology and environmental treatment, not only for conventional types of water pollution but also for antibiotics. Among the critical parameters for wetlands, the hydraulic loading rate (HLR) is especially important given the challenges of antibiotics treatment and frequent extreme rainfall. To investigate the removal performance of different HLRs on nutrients and antibiotics, as well as the response of antibiotics to nutrient removal, and the impact of HLRs on microbial communities, new HCWs with vertical flow constructed wetlands (VFCWs) and floating constructed wetlands (FCWs) in series were built. The results of the study showed that: (1) HCWs are highly effective in removing chemical oxygen demand (COD), NH4+−N, NO2−−N, and total phosphorus (TP) at low HLR (L_HLR), with removal efficiencies as high as 97.8%, 99.6%, 100%, and 80.5%. However, high HLR (H_HLR) reduced their removal efficiencies;(2) The average removal efficiency of fluoroquinolones (FQs) under different HLRs was consistently high, at 99.9%, while the average removal efficiency of macrolides (MLs) was 96.3% (L_HLR) and 88.4% (H_HLR). The removal efficiency of sulfonamides (SAs) was susceptible to HLRs, and the removal of antibiotics occurred mainly in the rhizosphere zone of wetland;(3) High concentrations of antibiotics in HCWs were found to inhibit and poison plant growth and to reduce the removal efficiency of TP by 12%. However, they had a minor effect on the removal efficiency of carbon and nitrogen nutrients;(4) H_HLR altered the diversity and abundance of microbial communities in different compartments of the wetland and also reduced the relative abundance of Bacillus, Hydrogenophaga, Nakamurella, Denitratisoma and Acidovorax genera, which are involved in denitrification and phosphorus removal processes. This alteration in microbial communities was one of the main reasons for the reduced performance of nitrogen and phosphor

关键词： Wetlands

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Strong, Tough and Recyclable Polyimine Composites Via Core-Shell Polymer Reinforcement

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SSRN 2025年

作者： Wang, Haiyue Yu, Ping You, Changyi Hong, Wei Xu, Yang Tian, Zhanzhan Qiu, Hongying He, Hongfei Li, Wei Li, Ting Yu, Bin School of Environmental and Chemical Engineering Jiangsu Ocean University Lianyungang222005 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei230026 China Shanghai Cedar Composites Technology Co. Ltd Shanghai201306 China Center for Micro- and Nanoscale Research and Fabrication Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei230026 China

Dynamic polyimine is emerging as a promising alternative for next-generation plastics due to its unique properties of degradability and recyclability, addressing the growing issue of plastic pollution. However, the dynamic bond exchange in polyimine results in drawbacks such as insufficient mechanical performance and less environmental resistance. Thus, enhancing stability and mechanical properties without sacrificing dynamic performance remains a critical challenge. To address this issue, our work utilizes core-shell polymer (CSP) as a reinforcement to improve the stability and mechanical toughness of polyimine. By adjusting the ratio of CSP, a series of fluorene-based polyimine composite films (Cardo-DPI/CSP) were obtained. Compared to pure polyimine films (Cardo-DPI), Cardo-DPI/CSP exhibited not only increased toughness (5.2 vs 3.3 MJ/m³) but also significantly increased glass transition temperature (106 vs 81 °C), inducing by "network tightening". Notably, CSP’s incorporation significantly raised the contact angle values of polyimine by approximately 10° and slowed the rate of contact angle decrease. Also, Cardo-DPI/CSP demonstrated better acid resistance than Cardo-DPI under various acidic conditions. Furthermore, the dynamic properties of polyimine were not compromised by the incorporation of CSP. Cardo-DPI/CSP can be rapidly degraded and recycled at room temperature, while maintaining high tensile properties during thermal pressing and recovery from free amine degradation. These findings not only contribute to a deep understanding of this composite, but also offer novel strategies for optimizing polyimine properties, which are anticipated to broaden the application scope of dynamic polymers. © 2025, The Authors. All rights reserved.

关键词： Plastic recycling

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Janus C-Pan/Ph Membranes for Simulated Shale Gas Wastewater (Sgw) Treatment in Membrane Distillation: Integrating Surface Property and Catalytic Degradation for Anti-Fouling

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SSRN 2023年

作者： Xu, Chao Xu, Shihong Song, Jialing Jiang, Nan Yan, Mengying Li, Jun Huang, Manhong Key Laboratory of Science & Technology of Eco-Textile Ministry of Education College of Environmental Science and Engineering Donghua University Shanghai201620 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University Shanghai201620 China

Membrane distillation (MD) is considered to be an effective method to treat shale gas wastewater (SGW). However, membrane fouling has become big obstacle for this process. To alleviate membrane fouling, a novel dual-layer nanofibrous catalytic membrane (C-PAN/PH) contains a hydrophilic polyacrylonitrile (PAN) layer with Co-TPML nano-catalysts, and hydrophobic poly (vinylidene fluoride-hexafluoropropylene) (PH) layer was fabricated through electrospinning. Owning to surface hydration and peroxymonosulfate (PMS) activation of this novel membrane, feed solution containing kerosene or aniline could be effectively treated. Results showed water flux of C-PAN/PH membrane was 38% higher than that of PH membrane, which was due to higher temperature distribution in hydrophilic layer. C-PAN/PH membrane also exhibited stable flux for 10 h in dealing with 3000 mg/L oil/water emulsion due to hydration capability and small adhesion free energy of hydrophilic layer. Further, C-PAN/PH could remove>92% of the aniline within 2 min, and electron paramagnetic resonance (EPR) analyze indicated reactive species (•OH and SO4•-) play primary role in degradation process. Density functional theory (DFT) simulation suggests that PMS was strongly adsorbed on Co with adsorption energy of -3.77 eV. This study aims to design a novel MD-specific membrane for SGW treatment. © 2023, The Authors. All rights reserved.

关键词： Wastewater treatment

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Citric acid-assisted in-situ synthesis of a distinctive 3D flower-like spherical Bi₂MoO₆ nano-film and its enhanced CO₂ photoreduction activity

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Nano-Structures and Nano-Objects 2023年 33卷

作者： Zhao, Jing Guan, Xiushuai Zhang, Changming Xue, Jinbo Li, Rui Liu, Jianxin Zhang, Xiaochao College of Mining Engineering Taiyuan University of Technology Taiyuan 030024 China College of Chemical Engineering and Technology Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology) Taiyuan 030024 China College of Environmental Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

The photocatalytic CO2 reduction reaction for producing chemical fuels is an ideal advanced technology to effectively mitigate global warming and the energy crisis. Importantly, how to achieve excellent activity and c... 详细信息

The photocatalytic CO₂ reduction reaction for producing chemical fuels is an ideal advanced technology to effectively mitigate global warming and the energy crisis. Importantly, how to achieve excellent activity and cyclic utilization of photocatalysts has been one research hot-topic. In this work, a Bi₂MoO₆ (BMO) nano-film with a 3D flower-like spherical structure was fabricated on a Bi plate via a room-temperature in-situ electrochemical ion-exchange method with the assistance of citric acid (CA) (BMO (+CA)). The experimental results show that the BiOBr nano-film, as sacrificial template, plays an important role in the synthesis of the BMO nano-film. The BMO (+CA) nano-film exhibits superior photocatalytic CO₂ reduction activity with a CO yield (258μmol g⁻¹), under simulated sunlight irradiation, 3.6 times higher than the BMO (-CA) nano-film with a nanosheet-like structure. Moreover, the dominating reason and action mechanism of the enhanced photocatalytic CO₂ reduction performance for the BMO (+CA) nano-film are proposed. Our outcomes provide new insights into the development and research of highly-efficient Bi-based nano-films in the CO₂ reduction reaction field. © 2023 Elsevier B.V.

关键词： Bi plate Bi2MoO6 nano-film CO2 reduction In-situ growth method Photocatalysis

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A designed plasmid-transition strategy enables rapid construction of robust and versatile synthetic exoelectrogens for environmental applications

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environmental microbiology 2022年第11期24卷 5292-5305页

作者： Yang-Yang Fan Qiang Tang Hong Sun Han-Qing Yu CAS Key Laboratory of Urban Pollutant Conversion School of Life Sciences University of Science and Technology of China Hefei China. Department of Environmental Science and Engineering University of Science and Technology of China Hefei China. Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information Technology Anhui University Hefei China.

Genetic engineering is promising to expand the application scope of exoelectrogens in energy and environmental applications and plasmid vectors, as one type of fundamental tool, are intensively applied. Antibiotics are widely utilized for plasmid selection and maintenance; however, their utilization suffers from environmental concerns on the spread of resistance genes, elevated costs, inevitable genotypic instability and phenotypic heterogeneity. In this work, we establish an auxotrophic complementation system for stable plasmid maintenance without antibiotic association, in Shewanella oneidensis, an attractive model exoelectrogen. A plasmid-transition strategy is designed to facilitate the rapid and efficient construction of the auxotrophic complementation system. Such a system not only enables the same intensive gene expression as the conventional antibiotic-associated plasmid system but also exhibits remarkably superior robustness and stability. With this system, the menaquinone pool of the extracellular respiratory chain is enhanced first independently and further synergized by engineering the Mtr conduit, leading to significantly promoted extracellular electron transfer (EET) outputs (up to 10.33- and 2.97-fold improvement in the maximum current density and the maximum output voltage) and heavy metal Cr(VI) reduction ability (5.15-fold improvement). This work provides a robust and stable platform to engineer exoelectrogens for environmental applications.

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