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Development and application of photocatalytic coating for roadside NO_(x) mitigation in hong Kong

Chinese Chemical Letters 2024年第3期35卷 153-157页

作者： Xinwei Li Pengge Wang Shuwen Han Yu Huang wingkei ho Steven Sai Hang ho Shun-cheng Lee Meng Wang Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Loess and Quaternary Geology(SKLLQG)and Key Laboratory of Aerosol Chemistry and Physics Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Department of Science and Environmental Studies The Education University of Hong KongHong KongChina Division of Atmospheric Sciences Desert Research InstituteRenoNV 89512United States

A facile chemical method for the development of photocatalytic coating products was proposed based on practical application perspective for the hong Kong roadside nitrogen oxides(NO_(x))***_(2)-based photocatalytic coating PC-C film with crystallized size of around 5–6 nm was synthesized with the peptization of H_(2)O_(2).The PC-C coating possesses a super-hydrophilicity surface and is proven to have a NO_(x)degradation rate of 46.8%with an optimum pH level of *** addition,the PC-C coating presents a promising photocatalytic NO_(x)degradation compared with other commercially available coating products and P25 when applied on two building materials of poly-methyl methacrylate(PMMA)and concrete surface.A weather resistance simulation and a 180-day on-site field trial were carried out the attenuation effects of photocatalytic coating applied in outdoor *** on epidemiological estimation and field investigation,hospital admissions for respiratory diseases(HARD)and mortality cases(MC)could be reduced with the application of PC-C coating along the street *** work demonstrates the feasibility of air pollution control measures for the local roadside NO_(x)using photocatalytic technology,offering promising health benefits with environmental remediation.

关键词： Photocatalysis Coating NO_(x) mitigation hong Kong Roadside

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Efficient photocatalytic degradation of NO by ceramic foam air filters coated with mesoporous TiO_2 thin films

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Chinese Journal of Catalysis 2015年第12期36卷 2109-2118页

作者： wingkei ho 香港教育学院科学与环境学系和环境可持续教育中心香港理工大学环境技术和管理研究中心土木与环境工程系

Ceramic foam air filters with three-dimensional（3D） porous structures and high surface areas were coated with mesoporous TiO 2 thin films by the reverse micellar method. The mesoporous TiO 2 thin films efficiently photocatalytically degraded nitrogen oxide（NO）. More than 92.5% of NO was degraded in a single pass for air filter samples containing different pore densities. The 3D porous structure of the ceramic air filters enhanced flow turbulence and mixing. This provided the catalytic system with excellent gas-dynamic properties,and sufficient contact between the reactant gas and catalyst surface. The higher pore density of the ceramic foam filters resulted in a higher photocatalytic rate. More adsorption sites for water vapor and the reactant and product gases improved the photocatalytic activity. The porous ceramic air filters coated with mesoporous TiO 2 had large surface areas,and thus high photocatalytic activity. This overcame the common disadvantages associated with using powdered TiO 2 photocatalysts on substrates. The 3D porous ceramic foam filters coated with mesoporous TiO 2 thin films exhibited a higher photocatalytic degradation rate of NO in air than the same thin film deposited on flat ceramic tiles. No deactivation was observed. A consistently high NO degradation rate was obtained between reaction cycles for the TiO 2-coated 3D porous ceramic filters.

关键词： Titania Photocatalysis Ceramic Nitrogen oxide Coating

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Enhanced photocatalytic H2-production activity of WO3/TiO2 step-scheme heterojunction by graphene modification

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Chinese Journal of Catalysis 2020年第1期41卷 9-20页

作者： Fei He Aiyun Meng Bei Cheng wingkei ho Jiaguo Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070HubeiChina Department of Science and Environmental Studies and State Key Laboratory in Marine Pollution The Education University of Hong KongTai PoN.T.Hong KongChina Faculty of Science King Abdulaziz UniversityJeddah 21589Saudi Arabia

Sunlight-driven photocatalytic water-splitting for hydrogen(H2)evolution is a desirable strategy to utilize solar ***,this strategy is restricted by insufficient light harvesting and high photogenerated electron-hole recombination rates of TiO2-based ***,a graphene-modified WO3/TiO2 step-scheme heterojunction(S-scheme heterojunction)composite photocatalyst was fabricated by a facile one-step hydrothermal *** the ternary composite,TiO2 and WO3 nanoparticles adhered closely to reduced graphene oxide(rGO)and formed a novel S-scheme ***,rGO in the composite not only supplied abundant adsorption and catalytically active sites as an ideal support but also promoted electron separation and transfer from the conduction band of TiO2 by forming a Schottky junction between TiO2 and *** positive cooperative effect of the S-scheme heterojunction formed between WO3 and TiO2 and the Schottky heterojunction formed between TiO2 and graphene sheets suppressed the recombination of relatively useful electrons and *** effect also enhanced the light harvesting and promoted the reduction reaction at the active ***,the novel ternary WO3/TiO2/rGO composite demonstrated a remarkably enhanced photocatalytic H2 evolution rate of 245.8μmol g^-1 h^-1,which was approximately 3.5-fold that of pure *** work not only presents a low-cost graphene-based S-scheme heterojunction photocatalyst that was obtained via a feasible one-step hydrothermal approach to realize highly efficient H2 generation without using noble metals,but also provides new insights into the design of novel heterojunction photocatalysts.

关键词： Step-like heterojunction S-scheme heterojunction S heterojunction Photocatalyst Hydrogen generation

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TiO_(2)/In_(2)S_(3)S-scheme photocatalyst with enhanced H_(2)O_(2)-production activity

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Nano Research 2023年第4期16卷 4506-4514页

作者： Yi Yang Bei Cheng Jiaguo Yu Linxi Wang wingkei ho State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of Geosciences388 Lumo RoadWuhan 430074China Department of Science and Environmental Studies The Education University of Hong KongTai PoHong Kong 999077China

Photocatalytic production of hydrogen peroxide(H_(2)O_(2))is an ideal pathway for obtaining solar ***,an S-scheme heterojunction is constructed in hybrid TiO_(2)/In_(2)S_(3)photocatalyst,which greatly promotes the separation of photogenerated carriers to foster efficient H_(2)O_(2)*** composite photocatalysts show a high H_(2)O_(2)yield of 376μmol/(L·h).The mechanism of charge transfer and separation within the S-scheme heterojunction is well studied by computational methods and *** functional theory and in-situ irradiated X-ray photoelectron spectroscopy results reveal distinct features of the S-scheme heterojunction in the TiO_(2)/In_(2)S_(3)hybrids and demonstrate charge transfer *** density functional theory calculation and electron paramagnetic resonance results suggest that O_(2)reduction to H_(2)O_(2)follows stepwise one-electron ***_(2)S_(3)shows a much stronger interaction with O_(2)than TiO_(2)as well as a higher reduction ability,serving as the active sites for H_(2)O_(2)*** work provides a novel design of S-scheme photocatalyst with high H_(2)O_(2)evolution efficiency and mechanistically demonstrates the improved separation of charge carriers.

关键词： step-scheme heterojunction photocatalytic H_(2)O_(2)production TiO_(2)/In_(2)S_(3)nanofibres

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ZnxCd1–xS quantum dot with enhanced photocatalytic H2-production performance

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Chinese Journal of Catalysis 2021年第1期42卷 15-24页

作者： Rongrong Gao Bei Cheng Jiajie Fan Jiaguo Yu wingkei ho State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Department of Science and Environmental Studies The Education University of Hong KongHong KongChina

H2 is an important energy carrier for replacing fossil fuel in the future due to its high energy density and environmental *** a sustainable H2-generation method,photocatalytic H2 production by water splitting has attracted much ***,oil-soluble ZnxCd1-xS quantum dot(ZCS QD)with a uniform particle size distribution were prepared by a hot-injection ***,no photocatalytic H2-production activity was observed for the oil-soluble ZCS QD due to its ***,the oil-soluble ZCS QD was converted into a water-soluble ZCS QD by a ligand-exchange *** water-soluble ZCS QD exhibited excellent photocatalytic H2-production performance in the presence of glycerin and Ni^2+,with an apparent quantum efficiency of 15.9%under irradiation of 420 nm ***,the photocatalytic H2-generation activity of the ZCS QD was~10.7 times higher than that of the ZnxCd1-xS relative samples prepared by the conventional co-precipitation *** work will inspire the design and fabrication of other semiconductor QD photocatalysts because QD exhibits excellent separation efficiency for photogenerated electron-hole pairs due to its small crystallite size.

关键词： ZnxCd1-xS Solid-solution photocatalyst Photocatalytic H2 production Oil-soluble quantum dot Water-oil soluble quantum dot

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The photocatalytic ·OH production activity of g-C_(3)N_(4) improved by the introduction of NO

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Chinese Chemical Letters 2022年第10期33卷 4715-4718页

作者： Jun Jing Kai Qi Guohui Dong Mengmeng Wang wingkei ho School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China Department of Science and Environmental Studies and Centre for Education in Environmental Sustainability The Education University of Hong KongHong KongChina

The efficiency of photocatalytic pollutant removal largely depends on the ability of the photocatalytic system to produce hydroxyl radicals(·OH).however,the capability of photocatalyst to produce·OH is not strong at *** the capacity of photocatalytic system to produce·OH has always been a tough problem and challenge in the field of environmental *** this research,it was found that introducing nitric oxide(NO)into the graphitic carbon nitride(g-C_(3)N_(4))photocatalytic system could memorably enhance the ability of producing·OH *** study provides a new idea for improving the capacity of photocatalytic·OH production.

关键词： Active oxygen species Nitrogen oxide Photocatalysis Organic pollution g-C_(3)N_(4)

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Enhanced photocatalytic H_(2) production performance of CdS hollow spheres using C and Pt as bi-cocatalysts

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Chinese Journal of Catalysis 2021年第5期42卷 743-752页

作者： Shipeng Tang Yang Xia Jiajie Fan Bei Cheng Jiaguo Yu wingkei ho State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Department of Science and Environmental Studies The Education University of Hong KongTai PoN.T.Hong Kong 999077China

Photocatalytic H2 production from water splitting is an effective method to solve energy crisis and environmental pollution ***,carbon@CdS composite hollow spheres(C@CdS-HS)are fabricated via a facile hydrothermal method using porous carbon hollow spheres(C-HS)as the *** C@CdS-HS shows an excellent photocatalytic H2-generation rate of 20.9 mmol h^(−1) g^(−1)(apparent quantum efficiency of 15.3%at 420 nm),with 1.0 wt%Pt as a cocatalyst under simulated sunlight irradiation;this rate is 69.7,13.9,and 3.9 times higher than that obtained with pure CdS hollow spheres(CdS-HS),C@CdS-HS,and CdS-HS/Pt,*** enhanced photocatalytic H_(2)-evolution activity of C@CdS-HS/Pt is due to the synergistic effect of C and Pt as the *** C-HS serves not only as an active site provider but also as an electron transporter and ***,C-HS has a strong photothermal effect that is induced by near infrared light,which kinetically accelerates the H_(2)-production ***,the underlying charge transfer pathway and process from CdS to C−HS is *** work highlights the potential application of C-HS-based nanocomposites in solar-to-chemical energy conversion.

关键词： CdS hollow sphere Carbon Platinum Bi-cocatalyst Synergistic effect Photocatalytic hydrogen production

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Highly photoreactive TiO_2 hollow microspheres with super thermal stability for acetone oxidation

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Chinese Journal of Catalysis 2017年第12期38卷 2085-2093页

作者： Li Liang Kaining Li Kangle Lv wingkei ho Youyu Duan Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education Hubei Province College of Resources and Environmental Science South‐Central University for Nationalities Wuhan 430074 Hubei China Department of Science and Environmental Studies The Education University of Hong Kong Tai Po N.T. Hong Kong China

TiO2hollow microspheres(TiO2‐HMSs)have attracted much attention because of their high photoreactivity,low density,and good ***,anatase TiO2‐HMSs have poor thermal *** this study,surface‐fluorinated TiO2‐HMSs were assembled from hollow nanoparticles by the hydrothermal reaction of the mixed Ti(SO4)2–NH4HF–H2O2solution at180°*** effect of the calcination temperature on the structure and photoreactivity of the TiO2‐HMSs was systematically investigated,which was evaluated by photocatalytic oxidation of acetone in air under ultraviolet *** found that after calcination at300°C,the photoreactivity of the TiO2‐HMSs decreases from1.39×10?3min?1(TiO2‐HMS precursor)to0.82×10?3min?1because of removal of surface‐adsorbed fluoride *** increasing calcination temperature from300to900°C,the building blocks of the TiO2‐HMSs evolve from truncated bipyramidal shaped hollow nanoparticles to round solid nanoparticles,and the photoreactivity of the TiO2‐HMSs steady increases from0.82×10?3to2.09×10?3min?1because of enhanced *** increasing the calcination temperature to1000and1100°C results in a decrease of the photoreactivity,which is ascribed to a sharp decrease of the Brunauer–Emmett–Teller surface area and the beginning of the anatase–rutile phase transformation at1100°*** effect of surface‐adsorbed fluoride ions on the thermal stability of the TiO2‐HMSs is also discussed.

关键词： TiO2 hollow microsphere Photocatalytic oxidation Acetone Fluorine Thermal stability

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Highly enhanced visible-light photocatalytic NOx purification and conversion pathway on self-structurally modified g-C-3N4 nanosheets

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Science Bulletin 2018年第10期63卷 609-620页

作者： Yuhan Li Yanjuan Sun wingkei ho Yuxin Zhang hongwei Huang Qiang Cai Fan Dong Chongqing Key Laboratory of Catalysis and New Environmental Materials Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of Education College of Environment and Resources Chongqing Technology and Business University Chongqing 400067. China Department of Science and Environmental Studies. The Center for Education in Environmental Sustainability The Education University of Hong Kong. Hong Kong China College of Materials Science and Engineering National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology. Chongqing University.Chongqing 400044. China School of Materials Science and Technology National Laboratory of Mineral Materials China University of Geosciences Beijing 100083 China

The unmodified graphitic carbon nitride(g-C_3N_4) suffers from low photocatalytic activity because of the unfavourable *** the present work,we reported a simple self-structural modification strategy to optimize the microstructure of g-C_3N_4 and obtained graphene-like g-C_3N_4 nanosheets with porous *** contrast to traditional thermal pyrolysis preparation of g-C_3N_4,the present thermal condensation was improved via pyrolysis of thiourea in an alumina crucible without a cover,followed by secondary heat *** popcorn-like formation and layer-by-layer thermal exfoliation of graphene-like porous g-C_3N_4 was proposed to explain the formation *** photocatalytic removal performance of both NO and NO_2 with the graphene-like porous g-C_3N_4 for was significantly enhanced by selfstructural *** experiments and in-situ diffuse reflectance infrared fourier transform spectroscopy(DRIFTS) measurement were conducted to detect the active species during photocatalysis and the conversion pathway of g-C_3N_4 photocatalysis for NO_x purification was *** photocatalytic activity of graphene-like porous g-C_3N_4 was highly enhanced due to the improved charge separation and increased oxidation capacity of the ·O_2^- radicals and *** work could not only provide a novel self-structural modification for design of highly efficient photocatalysts,but also offer new insights into the mechanistic understanding of g-C_3N_4 photocatalysis.

关键词： Self-structural modification g-C3N4 Visible light photocatalysis In-situ DRIFTS Conversion pathway

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Tuning the strength of built-in electric field in 2D/2D g-C_(3)N_(4)/MS_(2) and g-C_(3)N_(4)/ZrS_(2) S-scheme heterojunctions by nonmetal doping

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Journal of Materiomics 2021年第5期7卷 988-997页

作者： Bicheng Zhu Haiyan Tan Jiajie Fan Bei Cheng Jiaguo Yu wingkei ho State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology122 Luoshi RoadWuhan430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China Department of Science and Environmental Studies The Education University of Hong KongTai PoN.T.Hong Kong999077China

Single photocatalysts usually exhibit unsatisfactory performance due to the serious recombination of photogenerated electron‒hole *** two photocatalysts to construct S-scheme heterojunction could solve this *** S-scheme mechanism,the interfacial built-in electric field(IEF)provides a vital driving force for efficient charge *** the IEF is a feasible strategy to further improve the photocatalytic ***,a novel idea of tuning the strength of IEF in 2D/2D graphitic carbon nitride(g-C_(3)N_(4))/MS2(M=Sn,Zr)S-scheme heterojunctions by nonmetal doping was developed by employing density functional theory *** nonmetal elements(O,P,and S)were severally introduced into g-C_(3)N_(4)/MS_(2) *** density difference suggested that O and S doping led to increased interfacial electron transfer,while P doping had minimal *** expected,the calculated field strength of O-and S-doped g-C_(3)N_(4)/MS_(2) composites was significantly larger than that of pristine and P-doped g-C_(3)N_(4)/MS_(2) ***,O and S doping endowed g-C_(3)N_(4)/MS_(2) Sscheme heterojunctions with enhanced IEF and more thorough charge ***,the experimentally synthesized O-C_(3)N_(4)/ZrS_(2) composite exhibited better photocatalytic H2-production activity than g-C_(3)N_(4)/ZrS_(2) *** work proposed an original idea of employing proper nonmetal doping to magnify the advantage of S-scheme heterojunction in accelerating charge separation.

关键词： Graphitic carbon nitride Density functional theory Field strength Photocatalysis Van der Waals heterostructure

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