Development and application of photocatalytic coating for roadside NOx mitigation in Hong Kong

Xinwei Li ¹Pengge Wang ²Shuwen Han ¹Yu Huang ²Wingkei Ho ³Steven Sai Hang Ho ⁴Shun-cheng Lee ¹Meng Wang¹

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作者信息

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
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Abstract

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(NOx)mitigation.TiO2-based photocatalytic coating PC-C film with crystallized size of around 5-6 nm was synthesized with the peptization of H2O2.The PC-C coating possesses a super-hydrophilicity surface and is proven to have a NOx degradation rate of 46.8％with an optimum pH level of 7.In addition,the PC-C coating presents a promising photocatalytic NOx degradation compared with other commercially available coating products and P25 when applied on two building materials of poly-methyl methacrylate(PMMA)and concrete sur-face.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 NOx using photocatalytic technology,offering promising health benefits with environmental remediation.

Key words

Photocatalysis/Coating/NOx mitigation/Hong Kong/Roadside

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基金项目

collaborative research project from Ove Arup & Partners Hong Kong Limited(P0038294)

Themebased Research Schemes of Research Grants Council,Hong Kong(T31-603/21-N)

Themebased Research Schemes of Research Grants Council,Hong Kong(T24-504/17-N)

General Research Fund,Research Grants Council of Hong Kong Government(18300920)

Dean's Research Fund(04738)

FLASS,EdUHK()

Highway Department of Hong Kong,SAR()

出版年

2024

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCDCSCD

影响因子：0.771

ISSN：1001-8417

参考文献量50

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