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SSRN 2024年

作者： Xu, Weijian Zhang, Yuying Su, Yilin Zhu, Xiaohong Wang, Lei Tsang, Daniel C.W. Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Department of Civil and Environmental Engineering University of California BerkeleyCA94720 United States State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou310027 China

The strategy of partially substituting cement with carbon-negative biochar to fabricate biochar-cement composites can represent a promising approach to reducing the carbon emissions of the construction industry. However, the detrimental impact on strength development from excessive biochar incorporation remains a significant challenge. To address this issue, this study pioneers a strategy to modify wood waste-derived biochar using seashell waste for enhancing its binding with the cement matrix. Employing a mechanochemical process, the shell-modified biochar was synthesized using oyster shell (OS) and wood waste (WW). The compressive strength of cement composites incorporating 5 wt.% modified biochar improved by 3.9-17% compared to the referenced biochar. Even with high biochar incorporation (30 wt.%), the compressive strength increased by 58.2% upon modifying the biochar at the OS/WW ratio of 1:9 (10SBC). The modified biochar refined the pore structures, accelerated the hydration kinetics, improved the degree of hydration, and fostered the development of the C-S-H gel network with a longer silicate chain and a higher polymerization degree. Furthermore, the strength enhancement of the biochar-cement composites was attributed to the improved micro-mechanical properties at the interfacial transition zone (ITZ), which increased the volume fraction of high-density C-S-H by 64.4-112% and decreased the low-density C-S-H fraction by 41.8-52.6%. Notably, 10SBC demonstrated a superior improvement due to its cohesive bond with the C-S-H gel and the concurrent densification of C-S-H in the ITZ, which was facilitated by the growth of Ca-/Al-rich hydration products. Overall, this study synergistically upcycled wood and seashell waste into value-added cement additives, thereby achieving strength enhancement of the cement composites. © 2024, The Authors. All rights reserved.

关键词： Compressive strength

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Advances, challenges, and prospects in microalgal-bacterial symbiosis system treating heavy metal wastewater

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Chemosphere 2023年 345卷 140448页

作者： Zhou, Xing-Rui Wang, Rong Tang, Cong-Cong Varrone, Cristiano He, Zhang-Wei Li, Zhi-Hua Wang, Xiaochang C. Key Laboratory of Northwest Water Resource Environment and Ecology Ministry of Education School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology Xi'an710055 China Shaanxi Key Laboratory of Environmental Engineering Xi'an University of Architecture and Technology Xi'an710055 China Department of Chemistry and BioScience Aalborg University Fredrik Bajers Vej 7H 9220 Aalborg Ø Denmark International Science & Technology Cooperation Center for Urban Alternative Water Resources Development Xi'an710055 China

Heavy metal (HM) pollution, particularly in its ionic form in water bodies, is a chronic issue threatening environmental security and human health. The microalgal-bacterial symbiosis (MABS) system, as the basis of water ecosystems, has the potential to treat HM wastewater in a sustainable manner, with the advantages of environmental friendliness and carbon sequestration. However, the differences between laboratory studies and engineering practices, including the complexity of pollutant compositions and extreme environmental conditions, limit the applications of the MABS system. Additionally, the biomass from the MABS system containing HMs requires further disposal or recycling. This review summarized the recent advances of the MABS system treating HM wastewater, including key mechanisms, influence factors related to HM removal, and the tolerance threshold values of the MABS system to HM toxicity. Furthermore, the challenges and prospects of the MABS system in treating actual HM wastewater are analyzed and discussed, and suggestions for biochar preparation from the MABS biomass containing HMs are provided. This review provides a reference point for the MABS system treating HM wastewater and the corresponding challenges faced by future engineering practices. © 2023 Elsevier Ltd

关键词： Heavy metals

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Industrial Femtosecond Laser Induced Construction of Micro/Nano Wettability Electrodes with Outstanding Hydrogen Evolution Performance

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SSRN 2023年

作者： Wang, Zekun Song, Lin Tao, Haiyan He, Yaowen Yang, Ying Wang, Tianqi Yu, Hui Lin, Jingquan Dong, Xiangting School of Physics Changchun University of Science and Technology Changchun130022 China Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province Changchun University of Science and Technology Changchun130022 China Zhongshan Institute Changchun University of Science and Technology Zhongshan528637 China School of Chemistry and Environmental Engineering

To realize an efficient hydrogen production in industrial water electrolysis, the development of catalytic systems with excellent hydrogen evolution performance, cost-effectiveness, high mechanical strength, and an easily applicable manufacturing process is essential. This paper describes a novel electrode preparation method, which allows constructing a micro-/nano-structured electrode surface composed of an NiO/Ni catalytic material using an industrial femtosecond laser in one step within only 8.75 min per cm2 . This electrode combines a fast charge transfer caused by the synergistic effect of Ni and NiO and a rapid dynamic cycle of bubble desorption and water replenishment induced by a high wettability to obtain an excellent and efficient hydrogen evolution performance. Electrochemical tests show that a very low overpotential of 57 mV is sufficient to deliver a current of 10 mA cm−2 in alkaline environment, and the activity is maintained for more than 144 h without decay, demonstrating the high stability of the system. Benefiting from the advantages of the industrial laser microfabrication technology, this work paves the way for the design and development of more efficient industrial electrocatalysts. © 2023, The Authors. All rights reserved.

关键词： Femtosecond lasers

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Morphology-dependent gas-sensing sensitivity of γ-Al2O3 for methacrolein

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SSRN 2024年

作者： Liu, Jiajian Li, Kaihui Tang, Jintian Chen, Yuchun Chen, Qingsong Gong, Quanquan An, Taicheng Zhang, Runkun Guangdong Provincial Engineering Technology Research Center of Public Health Detection and Assessment School of Public Health Guangdong Pharmaceutical University Guangzhou510310 China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and Engineering Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou510006 China State Grid Shandong Electric Power Research Institute Jinan250000 China

Methacrolein (MACR) is a key precursor in the formation of secondary organic aerosols and a significant occupational chemical hazard, posing risks to both the environment and health. In this work, three types of γ-Al2O3 were synthesized via a hydrothermal method, including nanorods, nanosheets, and a mixed morphology. Characterization results revealed that rod-like γ-Al2O3 has the largest specific surface area and the highest oxygen vacancy content. The possible formation mechanism of γAl2O3 samples with different morphologies was discussed. Further study indicated that the morphology of γ-Al2O3 significantly affects its sensitivity in the cataluminescence (CTL) sensing of MACR, with rod-like γ-Al2O3 exhibiting the highest sensitivity, whereas sheet-like γ-Al2O3 showed the lowest sensitivity. Thus, a CTL sensor based on rod-like γ-Al2O3 for MACR detection was developed, demonstrating outstanding performance in terms of sensitivity, selectivity, reproducibility, and stability. This sensor was applied to the analysis of real samples, and the results were in good agreement with those obtained through gas chromatography analysis. The sensing mechanism was further elucidated via density functional theory calculations, in situ Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry. This work broadens the horizons for applying material science principles to enhance the performance of gas sensors, thereby contributing to design high-performance CTL sensors for air quality and occupational safety monitoring. © 2024, The Authors. All rights reserved.

关键词： Aluminum oxide

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Superoxide Dismutase Plays an Important Role in Maize Resistance to Soil CO_(2)Stress

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 995-1001页

作者： XUE Lu MA Junjie HU Qian MA Jinfeng Carbon Neutral College(Yulin) Northwest UniversityXi’an 710069China College of Life Science Yulin UniversityYulinShaanxi 719000China National&Local Joint Engineering Research Center of Carbon Capture and Storage Technology Northwest UniversityXi’an 710127China Shaanxi Key Laboratory for Carbon Neutral Technology Northwest UniversityXi’an 710069China Department of Geology Northwest UniversityXi’an 710069China College of Urban and Environmental Sciences Northwest UniversityXi’an 710127China Oil Production Plant No.1 Sinopec North China Oil&Gas CompanyXianyangShaanxi 712000China

CO_(2)capture and storage(CCS)has the risk of CO_(2)leakage,and this leakage always increases soil CO_(2)concentration,and the long-term CO_(2)stress damages crop production in *** maize,the growth characteristics,such as plant height and yield,and physiological indexes(osmoregulation substances and antioxidant enzymes)were explored under different simulative CO_(2)leakage ***,the relationship between maize physiological indexes and soil CO_(2)concentration was analyzed,showing that soil CO_(2)stress inhibited maize growth to a certain extent,resulting in shorter plants,thinner stems and lower kernel *** an increase in soil CO_(2)concentration,the contents of malondialdehyde,soluble sugar and soluble protein in maize leaves increased;with continuing stress,the increase rate of malondialdehyde was greatly augmented,whereas the increase rates of soluble sugar and soluble protein *** extended CO_(2)stress,the activity of the enzyme superoxide dismutase(SOD)increased continuously,while the activities of catalase and peroxidase first increased and then *** dismutase activity was closely correlated with soil CO_(2)concentration(r=0.762),and responded quickly to the change of soil CO_(2)concentration(R~2=0.9951).Therefore,SOD plays an important role in maize resistance to soil CO_(2)*** study will help further understanding of the mechanism of maize tolerance to soil CO_(2)stress,providing a theoretical basis for agricultural production in CCS project areas.

关键词： CO_(2)capture and storage CO_(2)leakage soil CO_(2)stress antioxidant enzyme system maize

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Hierarchical Anion Exchange and Reverse Electron Transfer in Ldh/Peroxymonosulfate System for Roxarsone Elimination

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SSRN 2024年

作者： Pei, Wenkai Zheng, Yifan Gao, Jianyu Lei, Juying Liu, Yongdi Zhou, Liang Zhang, Jinlong Wang, Yu National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai200237 China Shanghai Engineering Research Center for Multi-media Environmental Catalysis and Resource Utilization Key Laboratory for Advanced Materials Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science and Technology 130 Meilong Road Shanghai200237 China Department of Molecular Engineering Graduate School of Engineering Kyoto University Kyoto-Daigaku Katsura Nishikyo-ku Kyoto615-8510 Japan State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Roxarsone (ROX) is the main form of As pollution in the world, and developing effective methods for its elimination is beneficial to human health and ecological environment. Herein, we report glutaraldehyde-crosslinked chitosan encapsulated CoCe-LDH as an outstanding catalyst for the advanced oxidation of ROX and the efficient adsorption of inorganic arsenic. 100% of ROX and more than 98.5% of As(III)/As(V) were eliminated, and over 99.3% of remained inorganic arsenic was oxidized to low toxicity As(V) in the PMS-activation system, and some specific properties of LDH are considered the main reasons. The hierarchical anion exchange has been confirmed to be beneficial for constructing a high concentration PMS inter layer microenvironment. And the unique reverse electron transfer process induced the 100% selective production of singlet oxygen. This work not only develops an advanced ROX removal method, but also provides a new understanding of LDH-based advanced oxidation process. © 2024, The Authors. All rights reserved.

关键词： Chemical activation

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Prediction of stable BC_(3)N_(2)monolayer from first-principles calculations:Stoichiometry,crystal structure,electronic and adsorption properties

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Chinese Chemical Letters 2021年第10期32卷 3149-3154页

作者： Jiahui Yu Chaozheng He Chunying Pu Ling Fu Dawei Zhou Kun Xie Jinrong Huo Chenxu Zhao Lingmin Yu Institute of Environmental and Energy Catalysis School of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China School of Mathematics and Physics Nanyang Institute of TechnologyNanyang 473004China Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices School of Materials Science and Chemical EngineeringXi'an Technological UniversityNanyang 473061China College of Physics and Electronic Engineering Nanyang Normal UniversityXi'an 710021China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui 741001China School of Sciences Xi'an Technological UniversityXi'an 710021China

In this paper,a novel BC_(3)N_(2)monolayer has been found with a graphene-like structure using the developed particle swarm optimization algorithm in combination with ab initio *** predicted structure meets the thermodynamical,dynamical,and mechanical stability ***,the BC_(3)N_(2)plane shows a metallic ***,BC_(3)N_(2)has an in-plane stiffness comparable to that of *** have also investigated the adsorption characteristics of CO_(2)on pristine monolayer and Mo functionalized monolayer using density functional ***,electronic structures of the interacting systems(CO_(2)molecule and substrates)have been preliminarily *** results show that Mo/BC_(3)N_(2)has a stronger adsorption capacity towards CO_(2)comparing with the pristine one,which can provide a reference for the further study of the CO_(2)reduction mechanism on the transition metal-functionalized surface as well as the new catalyst’s design.

关键词： Structure searching BC_(3)N_(2) First-principles Adsorption Catalyst Electronic structure

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Real-time Accident Anticipation for Autonomous Driving Through Monocular Depth-Enhanced 3D Modeling

arXiv

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arXiv 2024年

作者： Liao, Haicheng Li, Yongkang Wang, Chengyue Lai, Songning Li, Zhenning Bian, Zilin Lee, Jaeyoung Cui, Zhiyong Zhang, Guohui Xu, Chengzhong State Key Laboratory of Internet of Things for Smart City Department of Computer and Information Science University of Macau China Department of Information and Software Engineering University of Electronic Science and Technology of China Chengdu China State Key Laboratory of Internet of Things for Smart City University of Macau China State Key Laboratory of Internet of Things for Smart City Departments of Civil and Environmental Engineering and Computer and Information Science University of Macau China Guangzhou China Transportation Planning and Engineering The Department of Civil and Urban Engineering New York University New York United States School of Traffic and Transportation Engineering Central South University Changsha China School of Transportation Science and Engineering Beihang University Beijing China Department of Civil and Environmental Engineering University of Hawaii HonoluluHI United States

The primary goal of traffic accident anticipation is to foresee potential accidents in real time using dashcam videos, a task that is pivotal for enhancing the safety and reliability of autonomous driving technologies. In this study, we introduce an innovative framework, AccNet, which significantly advances the prediction capabilities beyond the current state-of-the-art 2D-based methods by incorporating monocular depth cues for sophisticated 3D scene modeling. Addressing the prevalent challenge of skewed data distribution in traffic accident datasets, we propose the Binary Adaptive Loss for Early Anticipation (BA-LEA). This novel loss function, together with a multi-task learning strategy, shifts the focus of the predictive model towards the critical moments preceding an accident. We rigorously evaluate the performance of our framework on three benchmark datasets—Dashcam Accident Dataset (DAD), Car Crash Dataset (CCD), and AnAn Accident Detection (A3D), and DADA-2000 Dataset—demonstrating its superior predictive accuracy through key metrics such as Average Precision (AP) and mean Time-To-Accident (mTTA). Copyright © 2024, The Authors. All rights reserved.

关键词： Multi-task learning

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Unveiling the Occurrence and Ecological Risks of Organophosphate Esters in Seawater of the Northern South China Sea

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SSRN 2024年

作者： Wang, Tao Chen, Xinwang Ben, Yujie Zhou, Hanlin Guo, Hangting Lin, Weimei Han, Yonghe Li, Jiabing Zhang, Hong Zhang, Yong Lin, Jie Fujian Key Laboratory of Pollution Control and Resource Reuse College of Environmental and Resource Sciences Fujian Normal University Fuzhou350117 China Department of Pulmonary and Critical Care Medicine Fujian Medical University Union Hospital Fuzhou350001 China School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China

Organophosphate esters (OPEs) are a class of emerging contaminants in marine environments. Understanding the occurrence, distribution, and potential risk of OPEs in seawater is crucial for the implementation of effective management actions. In this study, we carried out shipboard investigations to study the concentration, composition, source, and ecological risk of twelve typical OPEs in the surface seawater of the northern South China Sea (SCS) during August and September 2021. The results showed that eight in twelve OPEs were detected, with the total concentration of eight OPEs (Σ8OPEs) ranging from 30.5-238 ng/L in seawater. Chlorinated OPEs (Cl-OPEs) had the largest abundance, with a mean concentration of 69.8 ng/L, which accounts for more than 71.6% of Σ8OPEs. Among the detected congeners, tris(2-chloroethyl) phosphate (TCEP) was the most abundant OPE (mean: 51.0 ng/L, 52.3%), followed by triethyl phosphate (mean: 23.9 ng/L, 24.5%) and tris(1-chloro-2-propyl) phosphate (mean: 12.3 ng/L, 12.6%). Principal component analysis and Spearman correlation analysis indicated that terrestrial input and atmospheric deposition as well as shipping activities are the main sources of OPEs in the northern SCS. The ecological risk assessment revealed that several OPE congeners (tri-n-butyl phosphate, TCEP, and tris(1,3-dichloro-2-propyl) phosphate) posed low threats to aquatic organisms, as well as low ecological risks were predominantly observed for mixture OPEs. Further investigation is warranted to understand the environmental behavior and toxicity of OPEs in the SCS. © 2024, The Authors. All rights reserved.

关键词： Seawater

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Persistent, bioaccumulative, and toxic pollutants in migratory waterbirds from Bohai Bay, China: Implications on distinct pollutant sources

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science of the Total Environment 2025年 967卷 178782页

作者： Cao, Xingpei Wu, Yang Bai, Furong Zheng, Xiaobo Lei, Weipan Zhang, Zhengwang Mai, Bi-Xian State Key Laboratory of Advanced Environmental Technology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China Key Laboratory for Biodiversity Science and Ecological Engineering College of Life Sciences Beijing Normal University Beijing100875 China Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety College of Natural Resources and Environment South China Agricultural University Guangzhou510642 China CAS Center for Excellence in Deep Earth Science Guangzhou510640 China University of Chinese Academy of Sciences Beijing100049 China

Bohai Bay is an important stopover on the East Asian-Australasian flyway (EAAF) for migratory birds. In the present study, eggs of three migratory waterbird species, Little Terns (Sterna albifrons), Pied Avocets (Recurvirostra avosetta), and Black-winged Stilts (Himantopus himantopus), and local aquatic organisms from Bohai Bay (Nanpu and Dongying wetlands) were collected to determine stable isotope (13C, 15N, D) signature and concentrations of mercury (Hg), polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDTs), and short-chain chlorinated paraffins (SCCPs). Organisms from Nanpu had significantly higher δD values than Dongying, which was related to local salinity. The pollution profiles showed species-specific difference in the same site, but no spatial difference for the same bird species from two wetlands. Positive correlations were observed between δ15N values and concentrations of Hg and PCBs, but not DDTs and SCCPs, because of the complex pollution sources in migration routes. The pollution exposure in the annual life cycle for Pied Avocets based on migration route information suggests that Hg and PCBs in eggs mainly originate from the breeding site (Bohai Bay), while DDTs are mainly from the wintering sites (the middle and lower reaches of the Yangtze River). Pollutants could pose considerable negative effect on eggshell thickness. The present study promotes the importance of pollutant exposure and risk assessment in the entire migration cycle for migratory birds. © 2025 Elsevier B.V.

关键词： Haze pollution

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