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SSRN 2023年

作者： Liu, Zhen Jiao, Lishuai Yang, He Zhu, Muyao Zhang, Mengmeng Dong, Bowen College of Safety and Environmental Engineering Shandong University of Science and Technology 579 Qianwangang Rd Huangdao District Qingdao266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China

The effect of acidity and alkalinity of mine water on the ability of surfactants to wet coal was studied with contact angle measurements to determine the optimal aqueous surfactant concentration, quantitative osmosis experiments to characterize the wettability of coal, and atomic force microscopy to analyze the surface microstructure of the coal. The contact angle measurements showed that the optimum concentrations of both selected surfactants, sodium dodecyl sulfate (SDS) and coconut oil diethanolamide (CDEA), were 1.0 wt%, with contact angles on the coal samples of 25.8° and 36.1°, respectively, which were lower than from other concentrations of the surfactants. The use of quantitative osmosis experiments revealed that the acid-base environment of the surfactant solutions impacted the effect of the surfactants to different extents depending on the type of surfactant. SDS at pH = 9 had the best wetting performance and its osmosis height was 17.2´ greater than the treatment with water at pH = 7. Analyses with atomic force microscopy determined the effect of the wetting mechanism of the surfactant in different acid-base environments on the microstructural characteristics of the coal. The experiments showed that the surface morphology and pore structure of the coal changed after surfactant treatment in different acid-base environments, with more pore structures appearing on the surface of the coal samples. Both acidic and alkaline conditions could enhance the surface roughness of coal. Coal treated with SDS at a pH of 9 had the highest surface porosity of 13.8%. These studies clarify the microscopic wetting mechanism of the surfactants SDS and CDEA at different pH levels of mine water in terms of the microscopic surface morphology and pore structure of the coal, and provide an experimental basis for improving the wetting of coal and the water injection process of a coal seam. © 2023, The Authors. All rights reserved.

关键词： Wetting

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A Temperature Pre-Rectifier with Continuous Heat Storage and Release for Waste Heat Recovery from Periodic Flue Gas

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SSRN 2023年

作者： Qu, Hengyu Jiang, Binfan Liu, Xiangjun Xia, Dehong School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry University of Science and Technology Beijing Beijing100083 China Shunde Graduate School of University of Science and Technology Guangdong Beijing528399 China

Flue gas from periodic furnaces with large temperature fluctuation is difficult to be recovered by regular heat exchangers. To recover that unstable waste heat, a Temperature Pre-Rectifier (TPR) with honeycombed structure is developed to smooth down the temperature fluctuation by continuous heat-storing and releasing. A three-dimensional model with unsteady flow and heat transfer is constructed to analyze the heat transfer process. Temperature rectification rate η is defined to quantify the smoothing-down effect of temperature fluctuation. The η exhibit the most efficient performance when relative scale (s/δ) is 1.0. The optimized honeycomb size sopt increases exponentially with the inlet temperature fluctuation intensity ξinlet. The η is increased with dimensionless length l*. TPR with segmented structure (s and δ decreased in each segment) can enhance the η with relatively shorter length. Three-segmented structure with a proportion of 0.18:0.33:0.49 can achieve η higher than 0.947, which is recommended for application. Industrial experiments verified that the temperature fluctuation is rectified from 568~1709 K to 1089~1174 K (η = 0.926). A new perspective on waste heat recovery of periodic flue gas based on TPR is provided, and enhancing the efficiency of TPR may be a future challenge. © 2023, The Authors. All rights reserved.

关键词： Flue gases

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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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Using Waste to Improve the Weak: Recycled Seashell as an Ideal Way to Regulate the Itz in Biochar-Cement Composite

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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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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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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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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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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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