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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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Advanced Super-Wetting Biaxial Polypropylene Membrane with Hierarchical Rough Surface for Multipollutant Removal from Oily Wastewater

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SSRN 2023年

作者： Usha, Zubaida Rukhsana Babiker, Dafaalla M.D. Zhao, Yilei Chen, Xin Li, Liangbin National Synchrotron Radiation Laboratory Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film CAS Key Laboratory of Soft Matter Chemistry University of Science and Technology of China Hefei230026 China National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety Southwest University of Science and Technology Mianyang621010 China

The hazardous toxicity of oily wastewater creates a negative impact on the environment and ecosystem that has made water separation an open challenge on a global scale. A promising and workable tactic to prevent contaminations and effective water separation from oily wastewater has been proved using cutting-edge advanced polymeric membrane-based separation technology. Excessive hydrophobicity, contamination vulnerability, and membrane fouling are recurring and crippling problems for the treatment of oily wastewater. To overcome these difficulties, we design a facile, scalable, and highly efficient layer-by-layer modification technique using polyethylene imine and levo-3,4 dihydroxyphenylalanine cross-linked multi-layer assembled rough biaxial polypropylene membrane surface. The synergistic development of the rough surfaces causes the embeddedness of wetting properties of the modified membrane with excellent super hydrophilicity (0º) and underwater superoleophobicity (~164.3º). Such great underwater superoleophobicity shows a superior oil-repulsive property that helps to achieve high separation efficiency (99.9%) and permeate flux (2325.3 Lm−2h−1). Additionally, our modified membrane holds excellent anti-bacterial properties against S. aureus and E. coli bacteria with 92.8 and 88.6% viability, respectively. Notably, this highly efficient modified membrane is capable of removing multi pollutants (oil particles and bacteria) from oily wastewater in a more energy-efficient way. © 2023, The Authors. All rights reserved.

关键词： Wetting

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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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Research on Agricultural and Animal Husbandry Ecological Evolution in North China Based on Computer Machine Learning and GIS Spatial Analysis

Research on Agricultural and Animal Husbandry Ecological Evo...

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Power, Electrical engineering, Electronics and Control (PEEEC), International Conference on

作者： Chengyu Wang Runqiao Zhang Zhongguan Wen College of Earth Science and Engineering Xi’an Shiyou University Xi’an China Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen China School of Geosciences Yangtze University Wuhan China

ISBN: (数字)9798350378917

ISBN: (纸本)9798350378924

The agro-pastoral ecotone is an ecologically fragile and sensitive area. Based on multi-source data, this research analyzes the Geo-Informatic tupu and forecasts of the ecological evolution of Ordos city in the agro-pastoral zone from 1990 to 2020. The findings reveal that: (1) Fractional vegetation cover(FVC) has been in a tendency to decrease first and then continue to increase in the last 30 years, with a total of 85% of regions with medium or higher cover by 2020.(2)The Land-Use and Land-Cover Change(LUCC)has remained relatively stable over the last 30 years, with unused land dominating the stable areas $(43.38 \%)$ and unused land changing to woodland dominating the changing areas ($\gt14 \% / 10 a$), and ecological restoration measures being effective, with farmland forecast being turned mainly to grassland $\mathbf{(9 . 5 6 \%}$) and unused land to woodland $(9.20 \%)$ between 2020 and 2030.(3)In the last 30 years, the average annual temperature and annual equivalent precipitation have been fluctuating upwards, and the annual equivalent precipitation line has been moving in and out widely, with extreme drought (200mm) in 2000 and 2005, and the forecast indicates that temperature and humidity will continue to rise slowly in the future. It is found that the ecological quality of Ordos has fluctuated and improved over time due to the positive and negative effects of climate change and human activities. Therefore, ecological restoration and governance play a pivotal role, and scientific measures to deal with climate change in the future are essential to prevent ecological risks.

关键词： Climate change Agriculture Geographic information systems Ecology Temperature measurement Precipitation Vegetation mapping Land use planning Urban areas Land surface temperature Grasslands Droughts Humidity measurement Urban areas

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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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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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An Electro-Fenton-Like Reaction Pathway to Generate •Oh Avoiding O2-Aeration Using a Potential-Conversion Mode

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SSRN 2023年

作者： Gao, Mingming Zheng, Xue Li, Shuqi Zhao, Manshu Wang, Xinhua Wang, Shuguang School of Environmental Science and Engineering Shandong University of Science and Technology Qingdao266237 China Shandong Key Laboratory of Environmental Processes and Health Shandong University Qingdao266237 China Shandong Key Laboratory of Water Pollution Control and Resource Reuse Shandong University Qingdao266237 China WeiHai Research Institute of Industrial Technology of Shandong University Weihai264209 China

•OH generation via Electro-Fenton-like (EF-like) reactions mostly relies on O2-aeration, which results in a high energy consumption. Considering H2O2 generation during the anodic oxidation on graphite supported TiO2 composites (TiO2/C) anode and H2O2 decomposition to •OH via heterogeneous EF-like reaction on TiO2/C cathode, we designed a novel EF-like reaction pathway based on a potential-conversion mode. During this potential-conversion mode, the H2O2 and Ti-OH structure produced during the anode process was decomposed to •OH during the cathode process. The allocation of time and potential for potential-conversion mode was optimized as 1.0 V for 300 s and -0.6 V for 100 s, alternately. Under this condition, the •OH yield under potential-conversion mode (2.75 mg/L) was about three times higher than that under anode mode (0.8 mg/L). With cephalexin (CLN) as the target pollutant, the degradation efficiency reached 81.8% under potential-conversion mode and only 37.6% under anode mode within 90 min. When the EF-like device based on potential-conversion mode was used for simulating groundwater remediation, the CLN degradation efficiency were respectively 86.7%, 72.8% and 68.6% under the initial CLN concentration of 5, 10 and 20 mg/L within 8 h running at the hydraulic residence time (HRT) of 1 h. The HRT exhibited as a crucial parameter for the CLN degradation. The potential-conversion mode provides a new EF-like reaction pathway for the efficient •OH production without O2-aeration, offering a potentially cost-effective and eco-friendly method for water remediation. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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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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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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Wind Tunnel and Numerical Study of Wind Pressure Coefficients on a Medieval Swedish Church

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SSRN 2024年

作者： Liu, Wei Mattsson, Magnus Widström, Torun Claesson, Leif Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and Engineering Tianjin University 92 Weijin Road Tianjin300072 China Department of Civil and Architectural Engineering KTH Royal Institute of Technology Brinellvägen 23 Stockholm100 44 Sweden Department of Building Engineering Energy Systems and Sustainability Science University of Gävle Gävle801 76 Sweden

Air infiltration has great importance regarding energy, comfort, moisture and dust deposition in naturally ventilated historical buildings like churches. In these buildings, air infiltration is driven by stack effect and wind. When assessing the wind effect, reasonable estimation of wind pressure coefficients is crucial. Local wind pressure coefficients are significantly affected by the shape of the building and turbulence generated by its geometrical features, which – for moderately large churches – typically consist of main building body and window recesses, gable roof, tower, apse, and sacristy. This study conducted wind tunnel and numerical investigations of wind pressure coefficients at a church, with gradual addition of these features. Wind pressure was measured on a small-scale model in a wind tunnel, while computational fluid dynamics (CFD) simulations were carried out for both small-scale and full-scale models. By comparing the experimental and numerical results, the SST k − ω turbulence model showed the best accuracy, yielding CFD results in good agreement with wind tunnel measurements. Most challenging was predicting the strong negative wind pressures occurring on a flat roof. Building structures like tower, apse, and sacristy had significant impact on the wind pressures on the central, main building body. This study adds knowledge on wind pressure effects by commonly occurring building components, with particular reference to churches and similar buildings. © 2024, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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