Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde

Abstract The uptake of formaldehyde (HCHO) on mineral dust affects its budget as well as particle properties, yet the process has not yet been fully investigate. Here, TiO2 and nitrate-doped TiO2 aerosols were used as proxies for mineral dust, and the uptake of HCHO was explored in a chamber under b...

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Autores principales:	Jing Shang, Wei Wei Xu, Chun Xiang Ye, Christian George, Tong Zhu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c7ec853fe314479c991ad4bbdaebb700
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spelling	oai:doaj.org-article:c7ec853fe314479c991ad4bbdaebb7002021-12-02T11:41:08ZSynergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde10.1038/s41598-017-01396-x2045-2322https://doaj.org/article/c7ec853fe314479c991ad4bbdaebb7002017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01396-xhttps://doaj.org/toc/2045-2322Abstract The uptake of formaldehyde (HCHO) on mineral dust affects its budget as well as particle properties, yet the process has not yet been fully investigate. Here, TiO2 and nitrate-doped TiO2 aerosols were used as proxies for mineral dust, and the uptake of HCHO was explored in a chamber under both dark and illuminated conditions. The uptake loss of HCHO on UV-illuminated aerosols is 2–9 times faster than its gaseous photolysis in our experimental system. The uptake coefficient in the range of 0.43–1.68 × 10−7 is 1–2 orders of magnitude higher than previous reports on model mineral dust particles. The reaction rate exhibits a Langmuir-Hinshelwood-type dependence on nitrate content and relative humidity, suggesting the competitive role of nitrate salts, water vapor and HCHO on the TiO2 surface. The reaction produces carbon dioxide as the main product and gaseous formic acid as an important intermediate. The hydroxyl radical produced on illuminated TiO2 primarily drives the fast oxidation of HCHO. The nitrate radical arising from the TiO2-catalyzed photoreaction of nitrate synergistically promotes the oxidation process. This study suggests a novel oxidation route for HCHO in the atmosphere, taking into account high abundance of both mineral dust and anthropogenic TiO2 aerosols.Jing ShangWei Wei XuChun Xiang YeChristian GeorgeTong ZhuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jing Shang Wei Wei Xu Chun Xiang Ye Christian George Tong Zhu Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde
description	Abstract The uptake of formaldehyde (HCHO) on mineral dust affects its budget as well as particle properties, yet the process has not yet been fully investigate. Here, TiO2 and nitrate-doped TiO2 aerosols were used as proxies for mineral dust, and the uptake of HCHO was explored in a chamber under both dark and illuminated conditions. The uptake loss of HCHO on UV-illuminated aerosols is 2–9 times faster than its gaseous photolysis in our experimental system. The uptake coefficient in the range of 0.43–1.68 × 10−7 is 1–2 orders of magnitude higher than previous reports on model mineral dust particles. The reaction rate exhibits a Langmuir-Hinshelwood-type dependence on nitrate content and relative humidity, suggesting the competitive role of nitrate salts, water vapor and HCHO on the TiO2 surface. The reaction produces carbon dioxide as the main product and gaseous formic acid as an important intermediate. The hydroxyl radical produced on illuminated TiO2 primarily drives the fast oxidation of HCHO. The nitrate radical arising from the TiO2-catalyzed photoreaction of nitrate synergistically promotes the oxidation process. This study suggests a novel oxidation route for HCHO in the atmosphere, taking into account high abundance of both mineral dust and anthropogenic TiO2 aerosols.
format	article
author	Jing Shang Wei Wei Xu Chun Xiang Ye Christian George Tong Zhu
author_facet	Jing Shang Wei Wei Xu Chun Xiang Ye Christian George Tong Zhu
author_sort	Jing Shang
title	Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde
title_short	Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde
title_full	Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde
title_fullStr	Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde
title_full_unstemmed	Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde
title_sort	synergistic effect of nitrate-doped tio2 aerosols on the fast photochemical oxidation of formaldehyde
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c7ec853fe314479c991ad4bbdaebb700
work_keys_str_mv	AT jingshang synergisticeffectofnitratedopedtio2aerosolsonthefastphotochemicaloxidationofformaldehyde AT weiweixu synergisticeffectofnitratedopedtio2aerosolsonthefastphotochemicaloxidationofformaldehyde AT chunxiangye synergisticeffectofnitratedopedtio2aerosolsonthefastphotochemicaloxidationofformaldehyde AT christiangeorge synergisticeffectofnitratedopedtio2aerosolsonthefastphotochemicaloxidationofformaldehyde AT tongzhu synergisticeffectofnitratedopedtio2aerosolsonthefastphotochemicaloxidationofformaldehyde
_version_	1718395484356214784

Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde

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