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

作　　者：Xinwei Li Pengge Wang Shuwen Han Yu Huang Wingkei Ho Steven Sai Hang Ho Shun-cheng Lee Meng Wang 

机构地区：[1]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong,China [2]State Key Laboratory of Loess and Quaternary Geology(SKLLQG)and Key Laboratory of Aerosol Chemistry and Physics,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China [3]Department of Science and Environmental Studies,The Education University of Hong Kong,Hong Kong,China [4]Division of Atmospheric Sciences,Desert Research Institute,Reno,NV 89512,United States

出　　处：《Chinese Chemical Letters》2024年第3期153-157,共5页中国化学快报（英文版）

基　　金：supported by the collaborative research project from Ove Arup&Partners Hong Kong Limited(No.P0038294);Theme-based Research Schemes(Nos.T31-603/21-N and T24504/17-N)of Research Grants Council,Hong Kong;supported by the General Research Fund,Research Grants Council of Hong Kong Government(No.18300920);Dean’s Research Fund(No.04738),FLASS,EdUHK;supports from the Highway Department of Hong Kong,SAR for the field study part of this work。

摘　　要：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))mitigation.TiO_(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 7.In 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 exposure.Based 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 canyon.This 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 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]