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 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 vap

SUBMITTER: Shang J 

PROVIDER: S-EPMC5430731 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature