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The dual action of N_(2)on morphology regulation and mass-transfer acceleration of CO_(2)hydrate film

Chinese Journal of Chemical engineering 2024年第9期73卷 120-129页

作者： Jinrong Zhong Yu Tian Yifei Sun Li Wan Yan Xie Yujie Zhu Changyu Sun Guangjin Chen Yuefei Zhang School of Chemistry and Chemical Engineering Changsha University of Science and TechnologyChangsha 410114China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Institute of Environmental and Ecological Engineering Guangdong University of TechnologyGuangzhou 510006China

The morphology characteristics of CH_(4),CO_(2),and CO_(2)+N_(2)hydrate film forming on the suspending gas bubbles are studied using microscopic visual method at supercooling conditions from 1.0 to 3.0 *** hydrate film vertical growth rate and thickness along the planar gas-water interface are measured to study the hydrate formation kinetics and mass transfer *** N_(2)in the gas mixture plays the same role as lowering the supercooling conditions,both retarding the crystal nucleation and growth rates,which results in larger single crystal size and rough hydrate morphology.N_(2)in the gas mixture helps to delay the secondary nucleation on the hydrate film,which is beneficial to maintain the porethroat structure and enhance the mass *** vertical growth rate of hydrate film mainly depends on the supercooling conditions and gas compositions but has weak dependence on the experimental temperature and *** the same gas composition condition,the final film thickness shows a linear relationship with the supercooling *** mass transfer coefficient of CH_(4)molecules in hydrates ranges from 4.54×10^(-8)to 7.54×10^(-8)mol·cm^(-2)·s^(-1)·MPa^(-1).The maximum mass transfer coefficient for CO_(2)t N_(2)hydrate occurs at the composition of 60%CO_(2)t 40%N_(2),which is 3.98×10^(-8)mol·cm^(-2)·s^(-1)·MPa^(-1).

关键词： Gas hydrate Morphology Secondary nucleation Formation kinetics Mass transfer

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Enhancing the thermal conductivity of nanofibrillated cellulose films with 1D BN belts formed by in-situ generation and sintering of BN nanosheets

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Journal of Advanced Ceramics 2023年第12期12卷 2257-2270页

作者： Baokai Wang Zheng Zhao Mengyi Li Mengyang Niu Jialu Tian Chang Yu Shiqin Wan Ming Yue Weiwei Xuan Wenbin Cao Zhaobo Tian Kexin Chen Qi Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The rapid miniaturization and high integration of modern electronic devices have brought an increasing demand for polymer-based thermal management materials with higher thermal *** nitride nanosheets(BNNs)have been widely used as thermally conductive fillers benefiting from the extremely high intrinsic thermal ***,the small lateral size and weak interface bonding of BNNs enabled them to only form thermally conductive networks through physical overlap,resulting in high interfacial thermal *** address this issue,an innovative strategy based on interface engineering was proposed in this ***-aspect-ratio boron nitride belts(BNbs)were successfully synthesized by carbon thermal reduction nitridation method through the in-situ generation and sintering of *** surface of BNb showed the sintering of numerous smaller-sized BNNs,which precisely addresses the issue of weak interfacial bonding between *** this basis,the as-synthesized BNbs were combined with nano-fibrillated cellulose(NFC)to prepare NFC/BNb composite films through a facile vacuum filtration *** to the thermally conductive network formed by the horizontal oriented arrangement of BNb and their particular morphological advantages,the NFC/BNb films demonstrated significantly higher in-plane thermal conductivity than that of NFC/BNNs films,achieving the highest value of 19.119 W·m^(−1)·K^(−1) at a 20 wt%filling *** addition,the NFC/BNb films also exhibited superior thermal stability,mechanical strength,flexibility,and electrical insulation performance,suggesting the significant application potential of the designed BNb fillers in the thermal management field.

关键词： boron nitride(BN) thermal management materials vacuum filtration flexible thermally conductive films

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CO_(2) capture by modified clinoptilolite and its regeneration performance

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International Journal of Coal science & technology 2024年第2期11卷 81-90页

作者： Bo Jiang Bo Zhang Xuqin Duan Yi Xing School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants University of Science and Technology BeijingBeijing 100083China YangQuan Coal Industry(Group)Co.Ltd. Yangquan 045000China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

This study focuses on CO_(2) capture by pressure swing adsorption(PSA),with modified clinoptilolite as the *** clinoptilolite is modified by roasting,by acid pickling,by a combination of acid pickling and roasting,and by ion *** by acid pickling-roasting and by ion exchange are found to give the highest CO_(2) adsorption capacities,of 730 mL/g and 876.7 mL/g,*** is found that regeneration of clinoptilolite by a combination of vacuum desorption and heating enables recovery of as much as 89%of its previous CO_(2) adsorption *** examine the CO_(2) adsorption capacity of clinoptilolite when applied to mixed gas,a simulated coking exhaust containing 12%CO_(2) and 4%O_(2) is used,and it is found that ion exchange modified clinoptilolite achieves a CO_(2) removal efficiency of 92.5%.A BET test reveals that acid pickling-roasting and Na^(+) modification enhance the porosity of clinoptilolite,thereby improving its adsorption *** work demonstrates the feasibility of applying modified clinoptilolite as an effective adsorbent for COO_(2)capture,providing a promising tool for dealing with greenhouse gases.

关键词： Clinoptilolite Carbon dioxide capture Pressure swing adsorption(PSA)

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Effect of Integration Time on the Performance Parameters of InGaAs Detectors

Effect of Integration Time on the Performance Parameters of ...

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2024 Conference on Spectral technology and Applications, CSTA 2024

作者： Luo, Xi Liu, Yuebo Zhang, Yichi Lu, Jianting Wei, Zhipeng Yang, Shaohua State Key Laboratory of High Power Semiconductor Lasers Changchun University of Science and Technology Changchun130022 China Reliability Physics and Application Technology of Electronic Component Key Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou511370 China

ISBN: (纸本)9781510683082

Shortwave infrared imaging has the characteristics of high recognition and all-weather adaptation. Consequently, InGaAs short-wave infrared (SWIR) detectors find extensive applications in military and civilian fields, which imposes higher performance demands on InGaAs SWIR detectors. To optimize the performance and effectiveness of InGaAs SWIR detectors, this study delves into the fluctuation patterns of detectivity, responsivity, and dynamic range concerning integration time. Furthermore, it examines the outcomes of these parameters at various integration times. It is observed that the performance of InGaAs SWIR detectors changes at different integration times, and each parameter exhibits specific variation patterns with integration time. © 2024 SPIE.

关键词： Infrared detectors

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Integration of microbial reductive dehalogenation with persulfate activation and oxidation(Bio-RD-PAO)for complete attenuation of organohalides

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Frontiers of environmental science & engineering 2022年第2期16卷 87-108页

作者： Rifeng Wu Shanquan Wang Environmental Microbiomics Research Center School of Environmental Science and EngineeringGuangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation TechnologySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Sun Yat-sen UniversityGuangzhou 510006China

Due to the toxicity of bioaccumulative organohalides to human beings and ecosystems,a variety of biotic and abiotic remediation methods have been developed to remove organohalides from contaminated *** employing organohalide-respiring bacteria(OHRB)-mediated microbial reductive dehalogenation(Bio-RD)represents a cost-effective and environmentally friendly approach to attenuate highly-halogenated organohalides,specifically organohalides in soil,sediment and other anoxic ***,many factors severely restrict the implications of OHRB-based bioremediation,including incomplete dehalogenation,low abundance of OHRB and consequent low dechlorination ***,the development of in situ chemical oxidation(ISCO)based on sulfate radicals(SO_(4)^(·−))via the persulfate activation and oxidation(PAO)process has attracted tremendous research interest for the remediation of lowly-halogenated organohalides due to its following advantages,e.g.,complete attenuation,high reactivity and no selectivity to ***,integration of OHRB-mediated Bio-RD and subsequent PAO(Bio-RD-PAO)may provide a promising solution to the remediation of *** this review,we first provide an overview of current progress in Bio-RD and PAO and compare their limitations and *** then critically discuss the integration of Bio-RD and PAO(Bio-RD-PAO)for complete attenuation of organohalides and its prospects for future remediation ***,Bio-RD-PAO opens up opportunities for complete attenuation and consequent effective in situ remediation of persistent organohalide pollution.

关键词： Bio-RD-PAO Microbial reductive dehalogenation Persulfate Organohalide respiration Complete attenuation

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New Insights into Microplastic Contamination in Different Types of Leachates: Abundances, Characteristics, and Potential Sources

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engineering 2024年第6期37卷 62-68页

作者： Lei Zhang Wentao Zhao Liang Zhang Zhenxiao Cai Ruiqi Yan Xia Yu Damià Barceló Qian Sui State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China PerkinElmer Inc.Shanghai 201203China Maihai Environmental Protection Technology Co. Ltd.SuzhouJiangsu 215000China Department of Environmental Chemistry Institute of Environmental Assessment and Water ResearchSpanish Council for Scientific Research(IDAEA-CSIC)Barcelona 08034Spain

Municipal solid waste(MSW)is an important destination for abandoned *** the waste disposal process,large plastic debris is broken down into microplastics(MPs)and released into the ***,current research only focuses on landfill leachates,and the occurrence of MPs in other leachates has not been ***,herein,the abundance and characteristics of MPs in three types of leachates,namely,landfill leachate,residual waste leachate,and household food waste leachate,were studied,all leachates were collected from the largest waste disposal center in *** results showed that the average MP abundances in the different types of leachates ranged from(129±54)to(1288±184)MP particles per liter(particlesL1)and the household food waste leachate exhibited the highest MP abundance(p<0.05).Polyethylene(PE)and fragments were the dominant polymer type and shape in MPs,*** characteristic polymer types of MPs in individual leachates were ***,the conditional fragmentation model indicated that the landfilling process considerably affected the size distribution of MPs in leachates,leading to a higher percentage(>80%)of small MPs(20–100 lm)in landfill leachates compared to other *** the best of our knowledge,this is the first study discussing the sources of MPs in different leachates,which is important for MP pollution control during MSW disposal.

关键词： Microplastics Landfill leachate Residual waste leachate Household food waste leachate Source

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Study on the effect of self-heating effect of bulk acoustic wave filter on the interpolation loss in the band

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International Journal of Nanomanufacturing 2023年第3-4期18卷 178-188页

作者： Ruan, Bin Liu, Tingting Yang, Shaohua Huang, Qinwen Wu, Ming Shao, Weiheng School of Information Engineering Southwest University of Science and Technology No. 59 Qinglong Road Sichuan Province Mianyang621010 China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability Environmental Testing Research Institute Guangdong Province Guangzhou510610 China Pandhus Microsystem Co. Ltd. Innovation Centre Phase 2 Room 301 Building 3 Science and Technology Business Park Sichuan Mianyang China

The self-heating effect occurs when the bulk acoustic wave filter is loaded with power, leading to the deterioration of the insertion loss. In this paper, the self-heating effect of bulk acoustic wave filters at high frequency power is investigated. A test system is built to obtain the maximum surface temperature and the insertion loss of the bulk acoustic wave filter at different power levels. The test results show that the self-heating effect causes the internal temperature of the bulk acoustic wave filter to increase further after increasing the power, resulting in the increase of the insertion loss. The test system and analysis method in this paper verify the relationship between the self-heating effect and the insertion loss, and can provide guidance for the construction of the relevant reliability test system of the bulk acoustic wave filter. Copyright © The Author(s) 2023. Published by Inderscience Publishers Ltd.

关键词： Deterioration

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Synergistic promotion of particulate matter reduction and production performance via adjusting electrochemical reactions in the zinc electrolysis industry

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Frontiers of environmental science & engineering 2024年第1期18卷 23-33页

作者： Zizhen Ma Jingkun Jiang Lei Duan Jianguo Deng Fuyuan Xu Zehui Li Linhua Jiang Ning Duan School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266520China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of the EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China School of Physics Peking UniversityBeijing 100871China

Heavy particulate matter (PM) pollution and high energy consumption are the bottlenecks of hydrometallurgy, especially in the electrolysis process. Therefore, an urgent need is to explore PM reduction methods with production performance co-benefits. This study presents three PM reduction methods based on controlling operating parameters, i.e., lowering electrolyte temperature, H2SO4 concentration, and current density of the cathode. The optimized conditions were also investigated using the response surface methodology to balance the PM reduction effect and Zn production. The results showed that lowering electrolyte temperature is the most efficient, with an 89.0% reduction in the PM generation flux (GFPM). Reducing H2SO4 concentration led to the minimum side effects on the current efficiency of Zn deposition (CEZn) or power consumption (PC). With the premise of non-deteriorating CEZn and PC, GFPM can be reduced by 86.3% at the optimal condition (electrolyte temperature = 295 K, H2SO4 = 110 g/L, current density = 373 A/m^(2)). In addition, the reduction mechanism was elucidated by comprehensively analyzing bubble characteristics, electrochemical reactions, and surface tension. Results showed that lower electrolyte temperature inhibited the oxygen evolution reaction (OER) and compressed gas volume. Lower H2SO4 concentration inhibited the hydrogen evolution reaction (HER) and reduced electrolyte surface tension. Lower current density inhibited both OER and HER by decreasing the reaction current. The inhibited gas evolutions reduced the microbubbles’ number and size, thereby reducing GFPM. These results may provide energy-efficient PM reduction methods and theoretical hints of exploring cleaner PM reduction approaches for industrial electrolysis.

关键词： Zinc electrolysis Particulate matter Energy consumption Operating parameters Bubble characteristic Electrochemical reaction

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Electrical stress and acid orange 7 synergistically clear the blockage of electron flow in the methanogenesis of low-strength wastewater

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environmental science and Ecotechnology 2024年第4期20卷 291-299页

作者： Ze-Chong Guo Min-Hua Cui Chun-Xue Yang Hong-Liang Dai Tong-Yi Yang Lin-Zhi Zhai Yong Chen Wen-Zong Liu Ai-Jie Wang School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212100China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Jiangsu Key Laboratory of Anaerobic Biotechnology Jiangnan UniversityWuxi214122China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen518055China School of Geography and Tourism Harbin UniversityHarbin150001China School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Energy recovery from low-strength wastewater through anaerobic methanogenesis is constrained by limited substrate *** development of efficient methanogenic communities is critical but *** we develop a strategy to acclimate methanogenic communities using conductive carrier(CC),electrical stress(ES),and Acid Orange 7(AO7)in a modified *** synergistic integration of CC,ES,and AO7 precipitated a remarkable 72-fold surge in methane production rate compared to the *** increase was attributed to an altered methanogenic community function,independent of the continuous presence of AO7 and ***7 acted as an external electron acceptor,accelerating acetogenesis from fermentation intermediates,restructuring the bacterial community,and enriching electroactive bacteria(EAB).Meanwhile,CC and ES orchestrated the assembly of the archaeal community and promoted electrotrophic methanogens,enhancing acetotrophic methanogenesis electron flow via a mechanism distinct from direct electrochemical *** collective application of CC,ES,and AO7 effectively mitigated electron flow impediments in low-strength wastewater methanogenesis,achieving an additional 34%electron recovery from the *** study proposes a new method of amending anaerobic digestion systems with conductive materials to advance wastewater treatment,sustainability,and energy self-sufficiency.

关键词： Methanogenesis Conductive carrier Electrical stress Acid orange 7 Electron transfer

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Single-atom Ag-loaded carbon nitride photocatalysts for efficient degradation of acetaminophen:The role of Ag-atom and O_(2)

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Journal of environmental sciences 2024年第5期36卷 12-22页

作者： Yi Yuan Wen-Long Wang Zhi-Wei Wang Jin Wang Qian-Yuan Wu Key Laboratory of Microorganism Application and Risk Control of Shenzhen Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental SafetyInstitute of Environment and EcologyShenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China

Carbon nitride has been extensively used as a visible-light photocatalyst,but it has the disadvantages of a low specific surface area,rapid electron-hole recombination,and relatively low light *** this study,single-atom Ag was successfully anchored on ultrathin carbon nitride(UTCN)via thermal polymerization,the catalyst obtained is called *** Ag hardly changed the carbon nitride's layered and porous physical *** exhibited efficient visible-light photocatalytic performances in the degradation of various recalcitrant pollutants,eliminations of 85% were achieved by visible-light irradiation for *** with Ag improved the photocatalytic performance of UTCN by narrowing the forbidden band gap from 2.49 to 2.36 e V and suppressing electron-hole pair *** addition,Ag doping facilitated O_(2) adsorption on UTCN by decreasing the adsorption energy from -0.2 to -2.22 e V and favored the formation of O_(2)^(·-).Electron spin resonance and radical-quenching experiments showed that O_(2)^(·-)was the major reactive species in the degradation of Acetaminophen(paracetamol,APAP).

关键词： Ag single atom Carbon nitride Photocatalysis Visible light Adsorption energy Reactive species

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