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Here, TiO\n                    <jats:sub>2<\/jats:sub>\n                    and nitrate-doped TiO\n                    <jats:sub>2<\/jats:sub>\n                    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\u20139 times faster than its gaseous photolysis in our experimental system. The uptake coefficient in the range of 0.43\u20131.68\u2009\u00d7\u200910\n                    <jats:sup>\u22127<\/jats:sup>\n                    is 1\u20132 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 TiO\n                    <jats:sub>2<\/jats:sub>\n                    surface. The reaction produces carbon dioxide as the main product and gaseous formic acid as an important intermediate. The hydroxyl radical produced on illuminated TiO\n                    <jats:sub>2<\/jats:sub>\n                    primarily drives the fast oxidation of HCHO. The nitrate radical arising from the TiO\n                    <jats:sub>2<\/jats:sub>\n                    -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 TiO\n                    <jats:sub>2<\/jats:sub>\n                    aerosols.\n                  <\/jats:p>","DOI":"10.1038\/s41598-017-01396-x","type":"journal-article","created":{"date-parts":[[2017,4,19]],"date-time":"2017-04-19T11:41:09Z","timestamp":1492602069000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Synergistic effect of nitrate-doped TiO2 aerosols on the fast photochemical oxidation of formaldehyde"],"prefix":"10.1038","volume":"7","author":[{"given":"Jing","family":"Shang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei Wei","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun Xiang","family":"Ye","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1578-7056","authenticated-orcid":false,"given":"Christian","family":"George","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,4,25]]},"reference":[{"key":"1396_CR1","doi-asserted-by":"publisher","first-page":"24387","DOI":"10.1029\/2000JD900761","volume":"106","author":"AL Sumner","year":"2001","unstructured":"Sumner, A. 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