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Valorization of Saline Dredged Materials by Geopolymer Production: Salt Content Impact and Response Surface Methodology Analysis

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SSRN 2024年

作者： Wang, Zuobin Zhang, Qingbo Liu, Misha Yin, Jifu Mao, Xiaodan Hong, Guojun Cai, Xiang Zhang, Zhiqiang Xia, Siqing National Engineering Research Center of Dredging Technology and Equipment Key Laboratory of Dredging Technology CCCC Shanghai200082 China State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources College of Environmental Science and Engineering Tongji University Shanghai200092 China Ocean College Zhejiang University Hangzhou310058 China College of Geography and Environmental Sciences Zhejiang Normal University Jinhua321004 China

Significant quantities of saline sediments are dredged annually as part of coastal engineering and harbor maintenance operations. The valorization of saline dredged materials (DM) is highly important for minimizing environmental damage and promoting sustainable development. Using DM for geopolymer production has emerged as a sustainable alternative to saline DM disposal. Nevertheless, the impact of the salt content in DM on the process of geopolymer synthesis remains uncertain. This study synthesized geopolymers by mixing DM with fly ash (FA) and ground granulated blast furnace slag (GGBS), as well as an alkaline activator, and investigated the influence of salt content on the efflorescence and compressive strength properties of the produced geopolymers. The findings demonstrated that it is feasible to make a DM-FA/GGBS geopolymer with satisfactory resistance to efflorescence and compressive strength, as long as the salt content in DM remains below 2%. An excessive salt content led to the oversaturation of sodium chloride (NaCl), resulting in NaCl crystal formation both on the surface and within the produced geopolymer. The presence of an excessive amount of sodium ions inhibited the geopolymerization reaction, causing a reduction in the length of the geopolymer chains and the loosening of the geopolymer matrix. This could potentially lead to a decrease in the compressive strength of the DM-based geopolymer. Furthermore, a response surface methodology (RSM) study was performed to investigate the effects and interactions of DM addition, Na2O concentration, and activator modulus. The results demonstrated that the interaction effect of DM addition and Na2O concentration on the compressive strength was significant. © 2024, The Authors. All rights reserved.

关键词： Compressive strength

Directional Bioelectrochemical Dechlorination of Trichloroethene to Valuable Ethylene by Introduction Poly-3-Hydroxybutyrate as a Slow Release Carbon Source

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SSRN 2022年

作者： Chen, Xueqi Li, Zhiling Bai, Caihua Cao, Di Zu, Yunxia Zhang, Zimeng Zhao, Guanshu Nan, Jun Wang, Hongcheng Liang, Bin Wang, Aijie State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen518055 China

Bioelectrochemical dechlorination is one of the prospective and economic strategies for remediation of halogenated organics contaminated site, however, exploring the way of system construction with high detoxification efficiency and low organocarbon risk is still challenging. Herein, the slow-release organic carbon-sources (SOC) coupled bioelectrochemical dechlorination system with generally accelerated trichloroethene (TCE) dechlorination performance and controllable organocarbon release was reported. It is interestingly found the introduction of Poly-3-hydroxybutyrate (PHB) achieved the greatly improved dechlorination efficiency (2.23 times improved k value) with valuable ethylene as a major metabolite (recovery ratio of 94.00±1.62%), reflecting the superior TCE detoxification and ethylene recovery potential. Microbial molecular mechanism analysis revealed the enriched electroactive dechlorinators ( Geobacter and Desulfovibrio ) in cathode representing the positive correlation (r>0.8, p © 2022, The Authors. All rights reserved.

关键词： Organic carbon

A Paradigm Shift of Compound Extremes over Polar Ice Sheets

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Ocean-Land-Atmosphere Research 2024年第1期3卷 364-367页

作者： Ran Yang Xiaoming Hu Ming Cai Yi Deng Kyle R.Clem Song Yang Lianlian Xu Qinghua Yang School of Atmospheric Sciences Sun Yat-sen University510275 GuangzhouChina Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) 519082 ZhuhaiChina Department of Earth Ocean and Atmospheric SciencesFlorida State UniversityTallahasseeFL 32304USA School of Earth and Atmospheric Sciences Georgia Institute of TechnologyAtlantaGA 30319USA School of Geography Environment and Earth SciencesVictoria University of WellingtonWellingtonNew Zealand Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen University519082 ZhuhaiChina

The paradigm of compound extremes shifts from hot-dry spells over ex-polar lands to warm-wet extremes over polar ice *** warm-wet synchrony is likely driven by intrusions of warm-moist air from lower latitudes,and und... 详细信息

关键词： latitude extremes warming

Synthesis, Crystal Structure and Fluorescence Property of a Zinc(Ⅱ) Coordination Polymer with a Theoretical Calculatio

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Chinese Journal of Structural Chemistry 2021年第1期40卷 79-84,3页

作者： WANG Wen-Qian CHEN Jun WANG Shuai-Hua WU Shao-Fan College of Chemistry and Chemical Engineering Fujian Normal UniversityFuzhou 350117China Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China School of Ecological Environment and Urban Construction Fujian University of TechnologyFuzhou 350118China

We have designed and synthesized a new luminescent coordination polymer[Zn_(2)(NO_(3))(NCP)_(3)(H2O)_(3)]n·2 nH_(2)O(1,HNCP=2-(2-carboxyphenyl)imidazo-[4,5-f]-1,10-phenanthroline)under hydrothermal conditions,which has been structurally characterized by single-crystal X-ray diffraction analyses.1 crystallizes in monoclinic,space group P2_(1)/n,with a=13.7748(3),b=19.2651(4),c=19.9543(4)Å,β=95.339(2)o,V=5272.35(19)Å^(3),C_(60) H_(39.73) N_(13) O_(13.33) Zn_(2),M_(r)=1286.80,D_(c)=1.621 g/cm^(3),Z=4,μ(Mo Ka)=2.118,F(000)=2629,the final R=0.0598 and w R=*** 1,the organic ligand NCP-displays two different bridging modes to connect adjacent Zn(II)ions into a 1 D chain along the *** analyses reveal that 1 exhibits a strong green emission with a fluorescent lifetime of 5.57 *** first-principle calculation results show that the luminescence mainly originates from ligand-centered charge transition.

关键词： hydrothermal method crystal structure luminescence theoretical calculation

Polycyclic aromatic hydrocarbons in paddy soils: Distribution, source apportionment, and risk assessment in major rice-growing regions of China

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Environmental Chemistry and Ecotoxicology

environmental Chemistry and Ecotoxicology 2025年 7卷 935-943页

作者： Liu, Daoyu Niu, Lili Guo, Zili Mao, Shuduan Liu, Shuren Xu, Dongmei Xu, Chao Sun, Xiaohui Yu, Haiying Liu, Weiping Zhejiang Provincial Key Laboratory of Digital Intelligence Monitoring and Restoration of Watershed Environment College of Geography and Environmental Sciences Zhejiang Normal University Zhejiang Jinhua321004 China and College of Biology and Environmental Engineering Zhejiang Shuren University Hangzhou310015 China College of Biology and Environmental Engineering Zhejiang Shuren University Hangzhou310015 China College of Environment Zhejiang University of Technology Hangzhou310014 China Ecological and Environmental Monitoring Center of Zhejiang Province Hangzhou310012 China MOE Key Laboratory of Environmental Remediation and Ecosystem Health Institute of Environmental Health College of Environmental and Resource Sciences Zhejiang University Hangzhou310058 China

Polycyclic aromatic hydrocarbons (PAHs) in agricultural environments and their potential health impacts have raised significant concern, particularly due to their substantial emissions from biomass and coal combustion. However, the environmental fate and human exposure risks of PAHs in flooded paddy soils, which are characterized by unique anaerobic conditions, remain poorly understood. To address this, we analyzed PAHs in flooded soils from three typical rice-growing regions in China, including Taihu Plain (TP), Hani Terrace (HT), and Sanjiang Plain (SP), covering a 4000 km transect with varying climatic and soil conditions. The concentrations of 16 U.S. environmental Protection Agency priority PAHs ranged from 87.5 to 5820 ng/g in the TP, 56.6 to 707 ng/g in the HT, and 98.6 to 1480 ng/g in the SP. Notably, we found that 4–6-ring PAHs dominated in the TP, whereas 3- and 4-ring compounds were more prevalent in the HT and SP. Molecular diagnostic ratios, positive matrix factorization, and principal component analysis identified biomass combustion as the primary source of PAHs. Although 7 carcinogenic PAHs represented less than one-third of the total PAH concentrations, their toxic effects accounted for over 90 % of the overall toxicity, with cancer risks from daily rice consumption exceeding 60 %. Most samples showed PAH intake levels below permissible limits, and no samples posed unacceptable non-carcinogenic risk. These findings highlight the urgent need for a deeper understanding of PAH risks in paddy fields, providing multi-regional insights into the environmental and health impacts of rice cultivation and contributing to sustainable agricultural practices. © 2024

关键词： Risk assessment

A Meso-Scale Fem-Sph Adaptive Model and Simulations of Fabric Under Hypervelocity Impact

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SSRN 2023年

作者： Xu, Huadong Zhou, Jia Cao, Xu Yu, Dong Miao, Changqing National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of Technology Harbin150001 China School of Water Conservancy & Civil Engineering Northeast Agricultural University Harbin150001 China School of Mechanical and Electrical Engineering Harbin Institute of Technology Harbin150001 China

A meso-scale FEM-SPH adaptive model for fabric is developed to simulate hypervelocity impact (HVI) response between multiple fabrics and projectile. An anisotropic elastic-plastic constitutive equation coupled with the Mie-Grüneisen equation of state (EOS) is adopted to describe deviatoric deformation and strongly nonlinear volumetric compression induced by HVI. Considering the interaction of fabric with hierarchical structure and the evolution of impact-induce fragments, a meso-scale FEM-SPH adaptive mesh was created for woven fabrics by finite element-smoothed particle hydrodynamics (FEM-SPH) adaptive method. The meso-scale mesh involves modeling the fabric using a fiber bundles level architecture around the impact region and a yarn level architecture at far field regions. The proposed numerical model is validated by comparing to damaged morphologies and shielding performance of fabric specimens from HVI experiments at different impact velocity. The simulation results are compared with the Lagrangian FEM model, and the results show that the FEM-SPH adaptive method has better prediction ability for the movement and diffusion of impact-induced debris clouds. In addition, the yarn partition sensitivity analysis by difference meso-scale fabric model demonstrates that the agreement of the simulation and experimental results increases with the increasing of the number of fiber bundles in the yarn cross-section, and further indicate that the meso-scale model developed in this paper for fabric has a good capacity for describing the essential details of fibers bundles/yarns in fabric during HVI. © 2023, The Authors. All rights reserved.

关键词： Yarn

Mechanistic Insight into Enhanced Methyl Orange Degradation by ***/Mos2 Biohybrid: Implications for Electron Transfer and Microbial Metabolism

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SSRN 2024年

作者： Wen, Xian Hou, Ya-Nan Guo, Jianbo Liu, Zhihua Ren, Nanqi Wang, Ai-Jie Wei, Wei Ni, Bing-Jie Huang, Cong Tianjin Key Laboratory of Aquatic Science and Technology School of Environmental and Municipal Engineering Tianjin Chengjian University Tianjin300384 China National Technology Innovation Center of Synthetic Biology Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin300308 China School of Civil Engineering and Architecture Taizhou University Zhejiang Taizhou318000 China State Key Laboratory of Urban Water Resource and Environment School of Civil & Environmental Engineering Harbin Institute of Technology Shenzhen518055 China Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney SydneyNSW2007 Australia Centre for Technology in Water and Wastewater Australia Harbin Institute of Technology China

Biological decolorization of traditional azo dyes is usually limited by low electron transfer rates, which can be overcome by the addition of nanoparticles with redox properties to form a stable biohybrid system. Here, a surface precipitated ***/MoS2 biohybrid with good biocompatibility was constructed. Batch experiments showed that hybrid 0.1-0.7 mM molybdic sulfide (MoS2) promoted the biological decolorization of methyl orange (MO), with ***/MoS2(0.5mM) exhibiting the fastest decolorization efficiency. The ***/MoS2 biohybrid improved microbial metabolic activity and enhanced electron transfer capacity, as evidenced by a respective increase of 92.08%, 42.61%, 85.89%, and 37.58% in the levels of nicotinamide adenine dinucleotide (NADH), adenosine triphosphate (ATP), electron transfer system activity (ETSA) and membrane permeability. According to structural equation model analysis, the biohybrid was significantly correlated with extracellular polymeric substances (EPS) and antioxidant stress capacity, with standardized path coefficients of 0.837 and 0.999, respectively, indicating enhanced environmental adaptability of ***. Based on the above exploration, the multi-faceted synergistic promotion mechanism of the ***/MoS2 biohybrid enhanced MO biodegradation was elaborated from microbial metabolic activity, electron transport ability and environmental adaptability. Overall, this study provided novel strategy for accelerating the biodegradation of azo dyes and deepened the understanding of the interactions between nanomaterials and microorganisms. © 2024, The Authors. All rights reserved.

关键词： Molybdenum compounds

Impacts of micron-sized aeration bubble on sludge properties and hydraulic dynamics in relation to membrane fouling alleviation

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Chemosphere 2024年 362卷 142582页

作者： Sun, Huifang Qin, Jiawen Yu, Wei Zhao, Huazhang Wang, Haibo Institute of Resources and Environmental Engineering Shanxi University Taiyuan030006 China College of Environment and Resource Sciences Shanxi University Taiyuan030006 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

This investigation elucidates the influence of micron-scale aeration bubbles on the improvement of anti-fouling characteristics within submerged membrane bioreactors (sMBRs). A systematic examination of sludge properties, hydraulic dynamics, and fouling tendencies revealed that the application of microbubble aeration, specifically at dimensions of 100 μm, 80 μm, and 30 μm, significantly reduced sludge electrostatic repulsion and augmented particle size distribution, as opposed to the utilization of coarse bubble aeration of 1 mm. Notably, the employment of 100 μm bubbles achieved a significant reduction in the proportion of smaller particles ( © 2024 Elsevier Ltd

关键词： Membrane fouling

Molecular Dynamics Simulation of Fatigue Damage Formation in Single-Crystal/Polycrystalline Aluminum

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SSRN 2024年

作者： Shen, Jinchuan Shen, Xingquan Zhou, Jinjie Yue, Wenying Zhang, Tianyu School of Mechanical Engineering North University of China Taiyuan030051 China Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment North University of China Taiyuan030051 China Jinxi Axle Company Limited Taiyuan030027 China

The fatigue plasticity mechanisms and local defect characteristics of engineering materials are critical for addressing fatigue damage. The fatigue mechanical properties and microstructural evolution processes of single-crystal/polycrystalline aluminum were investigated through strain-controlled fatigue testing, considering three distinct strain amplitudes. The microstructure characteristics of cyclic hardening, softening, and saturation in fatigue mechanical properties were investigated. The study aimed to investigate the initiation, accumulation of local plasticity, and formation of fatigue damage. The initiation and cumulative occurrence of local plasticity in single-crystal aluminum occur at the intersections of slip planes, which serving as sources of dislocations. The cumulative formation of irreversible surface steps results in local stress concentration, ultimately leading to fatigue damage at the free surface. Polycrystalline aluminum undergoes grain rotation and merging during cyclic loading, leading to a gradual increase in grain size during plastic deformation. The initiation and cumulative occurrence of local plasticity occur at grain boundaries, ultimately leading to fatigue damage at the grain boundaries. © 2024, The Authors. All rights reserved.

关键词： Molecular dynamics