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SSRN 2023年

作者： Chi, Wenting Chen, Guojun Hu, Shiwen Li, Xiaomin Cheng, Kuan Wang, Qi Xia, Bingqing Yang, Yang Ma, Yibing Liu, Tongxu Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Institute of Eco-environmental and Soil Sciences Guangdong Academy of Sciences Guangzhou510650 China University of Chinese Academy of Sciences Beijing100049 China SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety MOE Key Laboratory of Theoretical Chemistry of Environment South China Normal University Guangzhou510006 China School of Environment South China Normal University Guangzhou510006 China Macao Environmental Research Institute Macau University of Science and Technology Taipa999078 China Southern University of Science and Technology China

Paddy fields located around estuaries suffer from seawater intrusion, and how and to what extent salinity levels influence Cd accumulation in rice grains is still unclear. Pot experiments were carried out by cultivating rice under alternating flooding and drainage conditions with different salinity levels (3.1, 10.1 and 30.3 mmol L−1 ionic strength). A significant increase in Cd content in rice roots and grains was observed in the treatment of 30.3 mmol L−1 ionic strength, which may be due to the upregulation of key genes regulating Cd uptake in rice roots. Moreover, the Cd availability was greatly enhanced at 30.3 mmol L−1 ionic strength due to the competition for binding sites by cations and the formation of Cd complexation with anions, which also contributed to Cd uptake by rice roots. In addition, a kinetic model was established to evaluate Cd transformation and we found that the release of Cd from organic matter and Fe-Mn oxides was greatly enhanced at 30.3 mmol L−1 ionic strength. Our findings elucidated the mechanisms by which high salinity enhanced Cd accumulation in rice grains, and more attention should be given to the food safety of rice cultivated around estuaries. © 2023, The Authors. All rights reserved.

关键词： Floods

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The numerical simulation of a new double swirl static mixer for gas reactants mixing

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Chinese Journal of Chemical engineering 2020年第9期28卷 2438-2446页

作者： Zhuokai Zhuang Jingtian Yan Chenglang Sun Haiqiang Wang Yuejun Wang Zhongbiao Wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental&Resources ScienceZhejiang UniversityHangzhou310058China Zhejiang Provincial Engineering Research Centre of Industrial Boiler&Furnace Flue Gas Pollution Control Hangzhou 310058China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Tianlan Environmental Protection Technology Co.Ltd Hangzhou 311202China

For the nitrogen oxide removal processes,high performance gas mixer is deeply needed for the injection of NH3 or *** this study,a new type of double swirl static mixer in gas mixing was investigated using computational fluid dynamics(CFD).The results obtained using Particle Image Velocimetry(PIV)correlated well with the results obtained from *** comparisons in pressure loss between the experimental results and the simulation results showed that the model was suitable and accurate for the simulation of the static *** process conditions and design were *** L/D equaled 4,coefficient of variation(COV)was<5%.The inlet velocity did not affect the distributions of turbulent kinetic *** terms of both COV and pressure loss,the inner connector is important in the design of the static *** nozzle length should be set at 4 *** both COV and pressure loss into consideration,the optimal oblique degree is *** averaged kinetic energy changed according to process conditions and *** new static mixer resulted in improved mixing performance in a more compact *** new static mixer is more energy efficient compared with other SV static ***,the double swirl static mixer is promising in gas mixing.

关键词： CFD PIV Gas mixing Double swirl static mixer Pressure loss

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Experimental insights into the nucleation and propagation of hydraulic fractures in anthracite coalbed methane reservoirs

Earth Energy Science

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Earth Energy science 2025年第2期1卷 123-143页

作者： Saipeng Huang Dameng Liu Enrique Gomez-Rivas Albert Griera Quan Gan Mengyao Wang Yin Xing Yang Zhao School of Resources and Safety Engineering Chongqing University Chongqing 400044 China Hubei Key Laboratory of Resources and Eco-Environment Geology Hubei Geological Bureau Wuhan 430034 China School of Energy Resources China University of Geosciences Beijing 100083 China Departament de Mineralogia Petrologia i Geologia Aplicada Facultat de Ciències de la Terra Universitat de Barcelona (UB) c/ Martí i Franquès s/n Barcelona 08028 Spain Departament de Geologia Universitat Autònoma de Barcelona Bellaterra Cerdanyola del Vallès 08193 Spain School of Geography Science and Geomatics Engineering Suzhou University of Science and Technology Suzhou 215009 China School of Petroleum Engineering Northeast Petroleum University Daqing 163318 China

Developing low-permeability Coalbed Methane (CBM) reservoirs can significantly benefit from a comprehensive understanding of hydraulic fracture nucleation and propagation mechanisms, particularly in anthracite CBM reservoirs. This study employs true-triaxial hydraulic fracturing experiments to investigate these mechanisms, with variables including injection flow rate, horizontal stress difference (σ H -σ h ), and bedding orientation. Additionally, we conduct corresponding numerical cases to validate the experimental conclusions. The research also considers re-fracturing instances. For the first time, we utilize a combination of Kaiser tests and the stress transfer function in ANSYS Workbench finite element analysis to accurately restore the confining pressure of the coal sample. The findings suggest that a high initial injection flow rate during hydraulic fracturing can promote fluid leakage and aid in maintaining substantial fracture pressure. Enhanced fracturing efficiency can be achieved through higher injection rates, and it can ensure optimal fracturing efficiency, minimizing roof and floor fracturing in coal reservoirs to prevent fracturing fluid leakage. The presence of a high horizontal stress difference facilitates hydraulic fracture propagation along the direction of the maximum horizontal compressive stress, requiring a greater hydraulic pressure to produce more fracture systems in coal reservoirs. Additionally, a minor deviation in the wellbore injection direction from the bedding orientation assists in creating a complex hydraulic fractured network, although this also requires higher hydraulic pressure to initiate new fractures. In the case of multiple hydraulic fracturing, the second initiation pressure tends to be significantly higher than the first, indicating that a sequential increase in hydraulic pressure aids the formation of additional fractures. Moreover, a simplified numerical simulation has been conducted to corroborate the experimental findi

关键词： Hydraulic fracturing Fracture propagation Horizontal stress difference Injection flow rate Bedding orientation

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A Novel Resin-Electrodialysis Hybrid System to Treat Rare-Earth Oxalic Precipitation Mother Liquid: Contamination Reduction, Efficient Y3+ Recovery, and Acid Separation

SSRN

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SSRN 2023年

作者： Zhou, Hengcheng Zheng, Zhi Chen, Yongjing Wan, Yinhua Sun, Jiaxuan Zhang, Tianci Chen, Dongdong Shi, Shaoyuan Ju, Peihai Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341119 China College of Resources and Environment Nanchang University Nanchang330031 China Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths Ganzhou341119 China JiangXi University of Science and Technology College of Resources and Environmental Engineering Ganzhou341000 China Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

A novel resin combined with selective electrodialysis (SED) process has been demonstrated to not only efficiently recover low concentration rare-earth elements (REEs) and separate hydrochloric acid, but also significantly reduce membrane fouling. Two resins with different functional groups were selected for pretreatment and recovery of Y3+ from Y rare-earth oxalic precipitation (Y REOP) mother liquor. CH-93 resin showed a Y recovery rate of over 94%, and the Y recovery efficiency remained above 90% after 5 cycles. The mother liquor treated with resin (R-T) and the untreated mother liquor (W-R-T) were subjected to acid separation via SED, and membrane fouling was systematically evaluated. Compared with W-R-T group, the hydrochloric acid recovery efficiency of R-T group increased by 21.01% (12V), and the unit energy consumption decreased by 54.30% (12V). The results of 3D fluorescence excitation-emission matrix (3D-EEM) and fluorescent region integration (FRI) showed the dissolved organic matter (DOM) on AEM and CEM in R-T group both decreased by more than 45%. The AEM of W-R-T group showed the highest fluorescence intensity ratio in V region (36%), indicating humic acid-like substances were the main cause of AEM fouling. Generally, this study provides a new approach for the resource utilization of REOP mother liquor. © 2023, The Authors. All rights reserved.

关键词： Electrodialysis

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Recommendations for green development of motor biofuel industry in China:A review

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International Journal of Agricultural and Biological engineering 2020年第5期13卷 218-225页

作者： Zongxi Zhang Gang Li Yinghua Zhang Jiang Zhang Chuanzeng Song Yuguang Zhou School of Mechanical and Electronic Engineering Shandong Jianzhu UniversityJi’nan 250101China School of Artificial Intelligence Beijing Technology and Business UniversityBeijing 100048China Ji’nan Technician College Jinan 250115China Laboratory of Bioenergy and Environment Science&Technology College of EngineeringChina Agricultural UniversityBeijing 100083China Key Laboratory of Clean Production and Utilization of Renewable Energy Ministry of Agriculture and Rural AffairsBeijing 100083China National Center for International Research of BioEnergy Science and Technology Ministry of Science and TechnologyBeijing 100083China

Motor biofuel is one kind of clean and sustainable fuel extracted from living organisms or obtained by the transformation of organisms,which can be used to replace fossil ***,motor biofuel is an important direction for the development and utilization of renewable *** attention has been given to the development and promotion of motor biofuel and relative technologies all over the *** research introduced the history of motor biofuel,the classification of motor biofuel as well as the strategies and policies made domestically and internationally in order to promote the development of motor biofuel,and also pointed out some of the urgent problems faced during the development of motor biofuels and put forward some suggestions for the future development of motor biofuel in China.

关键词： green development motor biofuel biodiesel bioethanol emission renewable energy replacement

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Dissolved Fractions and Solid Particles in Biochar Inhibited Soil Acidification Induced by Nitrification Through Different Pathways

SSRN

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SSRN 2022年

作者： Shi, Renyong Ni, Ni Wang, Ruhai Nkoh, Jackson Nkoh Pan, Xiaoying Dong, Ge Xu, Renkou Cui, Xiumin Li, Jiuyu State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences P.O. Box 821 Nanjing210008 China Nanjing Institute of Environmental Science Ministry of Ecology and Environment Nanjing210042 China Engineering and Technology Research Center for Agricultural Land Pollution Integrated Prevention and Control of Guangdong Higher Education Institutes College of Resources and Environment Zhongkai University of Agriculture and Engineering Guangzhou510225 China National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources College of Resources and Environment Shandong Agricultural University Tai’an271018 China

Biochar can inhibit soil acidification by decreasing proton release from nitrification and improving soil pH buffering capacity (pHBC). However, as a kind of complex materials, the role of different components of biochar in inhibiting soil acidification induced by nitrification is still unknown. To fill this gap, dissolved fractions and solid particles of biochar were separated and mixed thoroughly with an acid Ultisol before an incubation study following urea addition. Results showed that both the dissolved fractions and solid particles of biochar inhibited soil pH drop caused by nitrification. The dissolved fractions of biochar inhibited soil acidification by decreasing the proton input derived from nitrification, while the solid particles of biochar did it by enhancing the soil pHBC. The dissolved fractions from peanut straw biochar (PBC) and rice straw biochar (RBC) decreased the proton release by 16% and 18% at the end of incubation. The decrease in proton input was attributed to inhibition of soil nitrification and mineralization caused by the toxicity of phenols in biochar dissolved fractions to soil bacteria. The abundance of AOB and total bacteria decreased by more than 60% in the treatments with biochar dissolved fractions. Opposite effects were observed in the treatments with biochar solid particles. Soil pHBC increased 7% and 19% after the application of solid particles of RBC and PBC, respectively. The plentiful carboxyl on the surface of biochar solid particles was mainly responsible for the increase in soil pHBC. Generally, the mixed application of dissolved fractions and solid particles of biochar induces a superior effect on inhibiting soil acidification. The negative impacts of dissolved biochar components on soil microorganisms should be closely supervised. © 2022, The Authors. All rights reserved.

关键词： Nitrification

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Integrated Ziegler–Natta/Brookhart-Ni Catalysts for the Synthesis of Sutured Polar High-Impact Polypropylenes

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Angewandte Chemie 2024年第6期137卷

作者： Yu Wang Dr. Chao Li Assoc. Prof. Dr. Chen Tan Prof. Dr. Changle Chen Key Laboratory of Precision and Intelligent Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 China Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Key Laboratory of Environment-Friendly Polymeric Materials of Anhui Province Anhui University Hefei 230601 China

The direct synthesis of polar high-impact polypropylenes using industrially-preferred heterogeneous catalysts is challenging due to the poisoning of polar functional groups towards metal center and the high stereo-selectivity requirement. In this work, dual-site catalysts combining Ziegler–Natta and Brookhart-Ni catalysts were used to produce polar polyolefin ionomers, followed by polar high-impact polypropylenes containing isotactic polypropylene and branched polyethylene as toughening agents. Three combination modes between these catalysts were investigated, including mixed, core–shell, and integrated types. The integrated dual-site catalyst achieved the optimal material properties because the polyolefin ionomer acted as a suture molecule that stitched different components into a whole network. This produced sutured polar high-impact polypropylenes with excellent mechanical properties and compatibility with polar substances. The restraining effect of the suture molecules greatly reduced the release of microplastic particles after aging. Moreover, the obtained polar high-impact polypropylene can serve as an efficient compatibilizer to recycle polyethylene/polypropylene mixed-waste plastics. This work provides an appealing and potentially practical strategy to upgrade the widely used polypropylenes and to alleviate the ever-growing plastic pollution issue.

关键词： Polar monomer Nickel Ziegler–Natta High-Impact Polypropylene Microplastics

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The Design of the Highly Active Nh3-Scr Catalyst Ce-W/Uio-66: Close Coupling of Active Sites and Acidic Sites

SSRN

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SSRN 2022年

作者： Wang, Fei Wang, Chunxue Zhao, Ke Shan, Yulong Ma, Yixing Wang, Chi Sun, Xin Li, Kai He, Hong Ning, Ping Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming650500 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Faculty of Chemical Engineering Kunming University of Science and Technology Kunming650500 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China University of Chinese Academy of Sciences Beijing100049 China

Ce based catalyst is one of the most important NH3-SCR catalysts. It has been widely recognized that Ce3+ plays a crucial role in NH3-SCR reaction. However, the specific atomic sites for anchoring Ce atoms and the chemical mechanism underlying the formation of Ce3+ in CeO2 are still incompletely known. Herein, we demonstrate that there are abundant hydroxyl groups on the surface of UiO-66, which are the anchoring sites of Ce. As the loading continues to increase, the insufficiently anchored Ce species will agglomerate and induce the formation of Ce3+-rich CeO2 clusters, which served as the redox sites in 10%Ce/UiO-66. On this basis, the strong interaction between W and CeO2 was used to introduce highly dispersed acidic sites (WO3) around CeO2, and thus the redox site and the acidic site are tightly coupled. In situ DRIFTS results revealed that the NH3-SCR reaction pathway followed L-H mechanism on 10%Ce-10%W/UiO-66 catalyst, which is likely to be an important factor for the improved catalytic activity and stability. © 2022, The Authors. All rights reserved.

关键词： Catalyst activity

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Aligned Regenerated Cellulose Films with Enhanced Mechanical and Optical Properties for Light Management

SSRN

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SSRN 2023年

作者： Zhu, Weizhi Guan, Jilun Li, Wenjing Fang, Huayang He, Mei Sun, Jianping Wu, Yiqiang Zhu, Yanqiu Cheng, Fangchao State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of Resources Environment and Materials Guangxi University Nanning530004 China College of Material Science and Engineering Central South University of Forestry and Technology Changsha410004 China College of Engineering Mathematics and Physical Sciences University of Exeter ExeterEX4 4QF United Kingdom

The dissolution of cellulose endows the green and environment-friendly cellulosic material with a wide range of processing properties, further enhancing its advantages as a basic material. However, its unsatisfactory mechanical performance and functionality severely limited its practical application. Herein, a facile molecular orientation strategy was developed to orient the aggregated structure of the dissolved cellulose in the lithium chloride/N,N-dimethylacetamide system and obtain high performance films. During the treatment process, cross-linking, stretching, and hot pressing were utilized to anchor, orient, and fix the orientated structure of the cellulose molecular chains. Morphological analysis confirmed that the present process can produce an oriented microstructure of cellulose films with remarkable mechanical and optical properties. The optimal film obtained with a stretching ratio of 50 % exhibited a high mechanical strength of 145.9 MPa, and a high light transmittance of 86.2 %. Compared to the unstretched sample, the stretched films showed higher thermal stability, much higher mechanical strength (up to 169 % of the unstretched film), and stronger light polarization and scattering response. The present strategy, based on the regulation of cellulose aggregate structure, provides a promising approach for the development of advanced regenerated cellulose materials with excellent performance and multifunctional properties. © 2023, The Authors. All rights reserved.

关键词： Cellulose

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Using urban-suburban difference of atmospheric CO2 to evaluate carbon neutrality capacity in Hangzhou, China

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Journal of environmental sciences (China) 2025年

作者： Qi, Bing Hu, Cheng Yu, Yan Pang, Yuting Wu, Fangqi Yang, Xinjie Liu, Huili Zhang, Junqing Xiao, Qitao Liu, Cheng Xiao, Wei Hangzhou Meteorological Bureau Hangzhou310051 China College of Ecology and Environment Joint Center for sustainable Forestry in Southern China Nanjing Forestry University Nanjing210037 China Zhejiang Lin'an Atmospheric Background National Observation and Research Station Hangzhou 311300 China Nanjing University of Information Science & Technology Nanjing210044 China Zhejiang Institute of Meteorological Sciences Hangzhou310052 China Linping Meteorological Bureau Hangzhou311199 China Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing210008 China Jiangxi Provincial Key Laboratory of Genesis and Remediation of Groundwater Pollution/School of Water Resources and Environmental Engineering East China University of Technology Nanchang330013 China

China is the largest emitter of anthropogenic CO2 globally, with its cities recognized as significant emission hotspots. Consequently, evaluating anthropogenic CO2 emissions and the carbon neutral capability (CNC) of Chinese cities is critical for climate change mitigation. Despite this importance, no studies to date have assessed recent and future city-scale CNCs using the top-down atmospheric inversion approach, revealing substantial knowledge gaps regarding regional CO2 budgets. To address these issues, this research focused on Hangzhou, a megacity known for having the highest forest cover among China's provincial capitals, as study region. Year-round atmospheric CO2 concentration measurements were conducted from December 2020 to November 2021 at two sites: one urban and one suburban. These observations, along with their difference, were utilized to derive city-scale posterior anthropogenic CO2 emissions and to evaluate recent and future CNCs. Our key findings are as follows: (1) The manufacturing industry, energy industry and oil refineries/transformation industry were identified as the largest contributors to urban-suburban CO2 difference, accounting for 36.5 %, 21.3 %, and 16.6 %, respectively. Additionally, 82.5 %, 65.2 %, 81.2 % and 86.3 % of total anthropogenic CO2 enhancements were attributed to emissions within Hangzhou city in winter, spring, summer and autumn, respectively. (2) The posterior annual anthropogenic CO2 emission for Hangzhou was estimated at 4.65 (±0.72) × 1010 kg/a, indicating significant biases among different prior CO2 emission inventories. The annual biological CO2 sink, derived from multiple products, was estimated at -0.48 (±0.16) × 1010 kg. (3) The calculated CNC for 2021 was 10.3 % ± 3.4 %, highlighting a substantial gap towards achieving full carbon neutrality. Considering potential increases in ecosystem carbon sinks due to forest age and uncertainties from climate change, it was predicted that at least 65.2 %-82.6 % of anthropoge

关键词： Kyoto Protocol

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