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Accelerated oxidation of VOcs via vacuum ultraviolet photolysis coupled with wet scrubbing process

Journal of Environmental Sciences 2023年第12期134卷 55-64页

作者： Ruijie Xie Dongxue Lei Xiaowen Xie Ziyi Suo dennis y.c.leung Jianping cao Fang Ruimei Haibao Huang School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Department of Mechanical Engineering University of Hong KongHong Kong 999077China college of Environment and Resources Chongqing Technology and Business UniversityChongqing 400067China Scientific Research Academy of GuangXi Environmental Protection Nanning 530022China

Vacuum ultraviolet(VUV) photolysis is a facile method for volatile organic compounds(VOcs) elimination, but is greatly limited by the relatively low removal efficiency and the possible secondary pollution. To overcome above drawbacks, we developed an efficient method for VOcs elimination via VUV photolysis coupled with wet scrubbing process. In this coupled process, volatile toluene, a representative of VOcs, was oxidized by the gas-phase VUV photolysis, and then scrubbed into water for further oxidation by the liquid-phase VUV photolysis. More than 96% of toluene was efficiently removed by this coupled process, which was 2 times higher than that in the gas-phase VUV photolysis. This improvement was attributed to the synergistic effect between gas-phase and liquid-phase VUV photolysis. O3and HO·are the predomination reactive species for the toluene degradation in this coupled process, and the generation of O3in gas-phase VUV photolysis can efficiently enhance the HO·production in liquid-phase VUV photolysis. The result from in-situ proton transfer reaction ionization with mass analyzer(PTR-MS) further suggested that most intermediates were trapped by the wet scrubbing process and efficiently oxidized by the liquid-phase VUV photolysis, showing a high performance for controlling the secondary pollution. Furthermore, the result of stability test and the reuse of solution demonstrated that this coupled process has a highly stable and sustainable performance for toluene degradation. This study presents an environmentally benign and highly efficient VUV photolysis for gaseous VOcs removal in the wet scrubbing process.

关键词： Volatile organic compounds(VOcs) Vacuum ultraviolet(VUV)photolysis Wet scrubbing process Toluene degradation Intermediates analysis

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UV light-induced oxygen doping in graphitic carbon nitride with suppressed deep trapping for enhancement in cO_(2) photoreduction activity

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Journal of Materials Science & Technology 2023年第2期133卷 135-144页

作者： Xiaolong Zhao Xiaoping yi Wending Pan yifei Wang Shijing Luo yingguang Zhang Ruijie Xie dennis y.c.leung Department of Mechanical Engineering the University of Hong KongPokfulam RoadHong KongChina School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China

While photoreduction of cO_(2) to cH 4 is an effective means of producing value-added fuels,common pho-tocatalysts have poor activity and low selectivity in photocatalytic cO_(2)-reduction *** though creating defects is an effective photocatalyst fabrication route to improve photocatalytic activity,there are some challenges with the facile photocatalyst synthesis *** this work,an O element is in-troduced into a graphitic carbon nitride(cN)skeleton through a precursory ultraviolet light irradiation pretreatment to increase the visible light absorption and enhance the carrier density of this modified non-metal cN photocatalyst;the charge transfer dynamics thereof are also studied through electrochem-ical tests,photoluminescence spectroscopy,and nanosecond transient *** verify that the op-timized sample exhibits lower charge recombination and a suppressed 84 ns electron-trapping lifetime,compared to the 103 ns electron-trapping lifetime of the cN counterpart,and thereby.c.ntributes to ro-bust detrapping and a fast transfer of active *** density functional theory.c.lculations,we find that the improved light absorption and increased electron density are ascribed to O-element doping,which enhances the cO_(2) adsorption energy and improves the cO_(2)-to-cH 4 photoreduction activity;it be-comes 17 times higher than that of the bare cN,and the selectivity is 3.8 times higher than that of ***,the optimized sample demonstrates excellent cyclic stability in a 24-hour cycle test.

关键词： UV light Oxygen doping charge transfer Graphitic carbon nitride cO_(2)reduction

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construction of a novel Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)plasmonic heterojunction photocatalyst for high-efficiency photocatalysis

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Journal of Materials Science & Technology 2022年第6期101卷 37-48页

作者： Feihu Mu Benlin Dai Wei Zhao Shijian Zhou Haibao Huang Gang yang Dehua Xia yan Kong dennis y.c.leung Jiangsu Key Laboratory for chemistry of Low-Dimensional Materials School of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuaian 223300China State Key Laboratory of Materials-Oriented chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Environmental Science and Engineering Sun Yat-Sen UniversityGuangzhou 510000China

To boost the visible light catalytic performance of typical metal-organic frameworks(MOFs)materials(MIL-68(In)-NH_(2)),a novel stable Z-scheme Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)plasmonic photocatalyst was constructed by electrostatic attraction,co-precipitation reaction,and in-situ photoreduction reaction methods for the first *** photocatalytic activities of the photocatalysts are systematically explored by the photocatalytic degradation of bisphenol A(BPA)and reduction of cr(VI)under visible ***/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)displays the best photocatalytic performance among the as-prepared *** rate constant of BPA degradation on Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)is 0.09655 min^(-1),which is better than many reported photocatalytic *** also achieved a maximum rate constant of 0.02074min^(-1)for cr(VI)*** boosted photocatalytic performance is due to the improved absorption caused by localized surface plasmon resonance(LSPR),effective interface charge transfer and separation,and more reactive sites provided by the large specific surface ***,the photocatalytic degradation pathway of BPA is concluded according to Gc-MS ***,a more reasonable Z-scheme mechanism is speculated and verified through a series of characterizations and simulations,such as timeresolved photoluminescence spectroscopy(TRPL),electron spin resonance(ESR),and finite difference time domain(FDTD)method.

关键词： Photocatalysis Localized surface plasmon resonance Z-scheme MOFs Ag_(3)PO_(4)

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characteristics of urban ozone level in Hong kong

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Journal of Environmental Sciences 2001年第1期13卷 1-7页

作者： D.y.c.leung D.N.ZHANG Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongChina Research Institute of Environmental Engineering East China University of Science and TechnologyShanghai 200237China

The long term trend of ozone level in Hong Kong has been investigated. One of the characteristics of ozone level in Hong Kong is the existence of autumn maximum and summer minimum. Observations of the diurnal variation of ozone level have been made in different area categories. There are early morning peak and afternoon peak occurred in the diurnal variation, which are different from some metropolitans where only an afternoon peak is observed. A negative correlation coefficient was found between monthly ozone level with nitric oxide level. On the contrary, there is a positive correlation between ozone and nitrogen dioxide. The positive correlation coefficient between nitric oxide and nitrogen dioxide shows that the total amount of nitric oxide emitted from a series of moving and fixed sources greatly exceeded the stoichiometric amount of ozone formed from chemical reactions of precursors and long distance transportation.

关键词： ozone urban air pollution Hong kong china

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Particulate problems of different occupational environments in Hong Kong

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Journal of Environmental Sciences 1999年第4期11卷 385-391页

作者： leung y.c., cHEUNG K.K. (Department of Mechanical Engineering, The University of Hong Kong, Hong Kong Special Administrative Region) 香港大学机械工程系香港

This paper studied the air pollution problems that occurred in various working environments in Hong Kong through questionnaire survey and field measurements. Results of the survey showed that more than half of the respondents, who were affected by different kinds of air pollution, were suffering from either eye and nasal allergies, or throat irritation. Many of them recognized dust particulate to be the most serious air pollutant in their working environments. A portable laser dust monitor was employed to measure the levels of dust particulate that would be inhaled by people of different occupations and subject to different environments. The measurement results revealed that only some occupations were exposed to unacceptably high particulate levels. Generally, the particulate levels of most of the studied working environments, catering premises and entertainment places were much lower than the ambient levels and unlikely to pose any occupational hygiene problems.

关键词： air pollution dust particulate Hong Kong

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Analytical and Numerical Modelling of FRP Debonding from concrete Substrate under Pure Shearing

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Journal of Wuhan University of Technology(Materials Science) 2012年第1期27卷 142-148页

作者： PAN Jinlong XU Zhun c K y leung LI Zongjin Key Laboratory of concrete and Pre-stressed concrete Structures of Ministry of Education Southeast UniversityNanjing 210096 Dept.of civil and Environmental Engineering Hong Kong University of Science and TechnologyHongKongChina

External bonding of fiber reinforced polymer （FRP） composites on the concrete structures has been proved to be an effective and efficient way to strengthen concrete structures. For a FRP strengthened concrete beam, it is usually observed that the failure occurs in the concrete and a thin layer of concrete is attached on the surface of the debonded FRP plate. To study the debond behavior between concrete and FRP composites, an analytical model based on the three-parameter model is developed to study the debonding behavior for the FRP-to-concrete joint under pure shearing. Then, nonlinear FEM analysis is conducted to verify the PrOposed analytical model. The FEM results shows good agreement with the results from the model. Finally, with the analytical model, sensitivity analyses are performed to study the effect of the interracial parameters or the ~eometric parameters on the debondin~ behavior.

关键词： FRP composites debonding behavior analytical model nonlinear FEM analysis

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A novel Z-scheme ceO_(2)/g-c_(3)N_(4)heterojunction photocatalyst for degradation of Bisphenol A and hydrogen evolution and insight of the photocatalysis mechanism

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Journal of Materials Science & Technology 2021年第26期85卷 18-29页

作者： Wei Zhao Tiantian She Jingyi Zhang Guoxiang Wang Sujuan Zhang Wei Wei Gang yang Lili Zhang Dehua Xia Zhipeng cheng Haibao Huang dennis y.c.leung School of Geography School of EnvironmentNanjing Normal UniversityNanjing210000China Jiangsu collaborative Innovation center of Regional Modern Agriculture&Environmental Protection School of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuaian223001China School of Materials Engineering Changshu Institute of TechnologyChangshu215500China Department of Mechanical Engineering The University of Hong Kong999077Hong KongChina School of Environmental Science and Engineering Sun Yat-Sen UniversityGuangzhou510000China Huaibei Normal University Huaibei235000China

ceO_(2)/g-c_(3)N_(4)heterojunction photocatalyst had been successfully fabricated through a one-step in-situ pyrolysis formation of 3D hollow ceO_(2)mesoporous nanospheres and 2D g-c_(3)N_(4)nanosheets together with simultaneous removal of carbon sphere templates after heat *** sample shows high catalytic performances for photocatalytic hydrogen generation and photocatalytic oxidation of Bisphenol A(BPA)under visible light irradiation,and the catalytic degradation route of BPA was suggested by the degradation products determined by *** enhancing catalytic activity was attributed to the effective interfacial charge migration and ***,it was proposed that the ceO_(2)/g-c_(3)N_(4)heterojunction photocatalyst could follow a more appropriate Z-scheme charge transfer mechanism,which was confirmed by the analysis of experiment and theoretical calculation results.

关键词： Heterojunction Photocatalysts Hydrogen generation charge separation

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Non-aqueous Al-ion batteries:cathode materials and corresponding underlying ion storage mechanisms

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Rare Metals 2022年第3期41卷 762-774页

作者： Wen-Ding Pan cheng Liu Ming-yue Wang Zheng-Jie Zhang Xiao-yu yan Shi-chun yang Xin-Hua Liu yi-Fei Wang dennis y.c.leung School of Electronic and Information Engineering Beihang UniversityBeijing 100091China Department of Mechanical Engineering the University of Hong KongPok Fu Lam 999077Hong KongChina State Grid Haiyang Power Supply.c.mpany Yantai 265100China Faculty of Engineering Dyson School of Design EngineeringImperial College LondonLondon SW72AZUK School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China

Aluminum-ion batteries(AIBs)are recognized as one of the promising candidates for future energy stor-age devices due to their merits of cost-effectiveness,high voltage,and high-power *** efforts have been devoted to the development of cathode materials,and the progress has been well summarized in this review ***,in addition to materials,the intercalation mechanism also plays a key role in determining cell ***,the research progress of cathode materials and corresponding ion intercalation mechanism in AIBs are summarized,including intercalation of Alcl_(4)-,intercala-tion of Al^(3+),and coordination of Alcl_(2)^(+)/Alcl^(2+).This minireview provides comprehensive guidance on the design of cathode materials for the development of high-performance AIBs.

关键词： Multivalent-ion battery Al-ion battery Nonaqueous electrolyte cathode material Ion intercalation mechanism

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Mimotope-based allergen-specific immunotherapy: ready for prime time?

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cellular & Molecular Immunology 2019年第11期16卷 890-891页

作者： Nicki y.H.leung christine y.y.Wai Ka Hou chu Patrick S.c.leung Department of Paediatrics The Chinese University of Hong KongShatinHong KongChina School of Life Sciences The Chinese University of Hong KongShatinHong KongChina Division of Rheumatology/Allergy School of MedicineUniversity of CaliforniaDavisCA 95616USA

INTRODUcTION Allergen-specific immunotherapy(AIT)is a therapeutic strategy to restore the normal immune response by suppressing inflammatory effector cells and inducing regulatory.c.lls specific to the culprit ***,AIT is achieved by administering escalating doses of allergen over a long treatment ***,the use of unmodified allergens for AIT often results in severe anaphylactic side effects,and alternative approaches such as hypoallergens and T-cell epitopes with enhanced safety have been *** use of mimotopes in AIT is a relatively new concept,but earlier proof-ofconcept studies showed promising results for mimotopes,with decent safety profiles and immunomodulatory *** the treatment of cancer with mimotope-based immunotherapy has already been tested in clinical trials2,mimotope-based AIT remains largely in the preclinical ***,we revisit the pros and cons of mimotope-based AIT and describe recent findings concerning the use of mimotopes in AIT.

关键词： immunotherapy doses treatment

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comparative Study on Shearing Edge Quality Influence of the change of Tool Geometry in Fine-Blanking for Non-homogeneous Materials

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厦门大学学报（自然科学版） 2002年第S1期41卷 117-118页

作者： y.c.leung L c chan T c Lee Department of Industrial and Systems Engineering the Hong Kong Polytechnic UniversityDepartment of Industrial and Systems Engineering the Hong Kong Polytechnic UniversityDepartment of Industrial and Systems Engineering the Hong Kong Polytechnic University Hong Kong ChinaHong Kong ChinaHong Kong China

Excellent quality of shearing edge implies that a s mo oth cutting edge without tearing will be observed on the whole edge surface. Thi s is one of the most significant features of the Fine-blanking process. To achi eve such a superb blanking edge quality in fine-blanking, there actually involv es quite a large number of factors, such as blanking speed, processing material, product shape, lubrication and tool geometry, to be considered simultaneously d uring the operation. Nevertheless, the thorough investigations on different effe cts of those critical factors for different kinds of popular and applicable mate rial are rare and limited. Thus, the objective of this paper is mainly focused o n the study of the quality influence of tool geometry.c.ange in fine-blanking f or non-homogeneous materials. However, the most obvious change of the tool geo metry during the operation will be the essential variation of the nose radius of the punch. This is because the nose radius usually seriously deteriorates with the increasing service period in mass production which eventually.c.uses the ent irely lose of the specific features of the fine-blanking process. Therefore, a tailor-made experimental study was carried out to investigate the relationship between the punch nose radius and the shearing edge quality, such as blanked edg e finish, burr height and die-roll height, during fine-blanking for different types of material. Five punches with each specified nose radius (Rp), 0.00 mm, 0.25 mm, 0.50 mm, 0.75 mm and 1.00 mm, and four kinds of blanking material ( Mil d steel SS400, Stainless steel AISI316L, copper alloy UNSc16200 and Aluminium al loy AA6063 ) were employed throughout the study. Subsequently, features of the s heared edge surfaces and data of each experiment were observed and captured for further analysis in this research. consequently, findings show that an increase of punch nose radius would produce a higher percentage of fracture of blanked ed ge and increase the

关键词： fine-blanking tool geometry shearing edge qual ity

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