Measurement of heterogeneous uptake of NO2 on inorganic particles, sea water and urban grime  

作　　者：Chuan Yu Zhe Wang Qingxin Ma Likun Xue Christian George Tao Wang 

机构地区：[1]Environment Research Institute,Shandong University,Qingdao 266237,China [2]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China [3]Division of Environment and Sustainability,The Hong Kong University of Science and Technology,Hong Kong 999077,China [4]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [5]Univ Lyon,UniversitéClaude Bernard Lyon 1,Centre National de la Recherche Scientifique(CNRS),Institut de Recherches sur la Catalyse et l’Environnement de Lyon(IRCELYON),Villeurbanne F-69626,France

出　　处：《Journal of Environmental Sciences》2021年第8期124-135,共12页环境科学学报（英文版）

基　　金：supported by the French National Research Agency/Research Grants Council of Hong Kong Special Administrative Region,China(ANR/RGC)Joint Research Scheme(project A-PolyU502/16-SEAM);National Natural Science Foundation of China(Nos.91744204,91844301);the Research Grants Council of Hong Kong Special Administrative Region,China(Nos.T24/504/17,15265516,C5022-14G);。

摘　　要：Heterogeneous reactions of NO2 on different surfaces play an important role in atmospheric NOxremoval and HONO formation,having profound impacts on photochemistry in polluted urban areas.Previous studies have suggested that the NO2 uptake on the ground or aerosol surfaces could be a dominant source for elevated HONO during the daytime.However,the uptake behavior of NO2 varies with different surfaces,and different uptake coefficients were used or derived in different studies.To obtain a more holistic picture of heterogeneous NO2 uptake on different surfaces,a series of laboratory experiments using different flow tube reactors was conducted,and the NO2 uptake coefficients(γ)were determined on inorganic particles,sea water and urban grime.The results showed that heterogeneous reactions on those surfaces were generally weak in dark conditions,with the measuredγvaried from<10-8 to 3.2×10-7 under different humidity.A photo-enhanced uptake of NO2 on urban grime was observed,with the obvious formation of HONO and NO from the heterogeneous reaction.The photo-enhancedγwas measured to be 1.9×10-6 at 5%relative humidity(RH)and 5.8×10-6 at 70%RH on urban grime,showing a positive RH dependence for both NO2 uptake and HONO formation.The results demonstrate an important role of urban grime in the daytime NO2-to-HONO conversion,and could be helpful to explain the unknown daytime HONO source in the polluted urban area.

关 键 词：NO2 uptake HONO source Heterogeneous uptake coefficient Urban grime 

分 类 号：X51[环境科学与工程—环境工程]