title: Temperature dependence of the heterogeneous uptake of acrylic acid on Arizona test dust.
abstract: In this study, the temperature dependence of the heterogeneous uptake of acrylic acid on Arizona test dust (ATD) has been investigated within a temperature range of 255-315K using a Knudsen cell reactor. Combined with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiment, it was found that acrylic acid could adsorb on ATD via surface OH groups and convert to carboxylate on the particle surface. The kinetics study suggests that the initial true uptake coefficient (γt) of acrylic acid on ATD decreases from (4.02±0.12)×10-5to (1.73±0.05)×10-5with a temperature increase from 255 to 315K. According to the temperature dependence of uptake coefficients, the enthalpy (ΔHobs) and entropy (ΔSobs) of uptake processes were determined to be -(9.60±0.38) KJ/mol and -(121.55±1.33) J·K/mol, respectively. The activation energy for desorption (Edes) was calculated to be (14.57±0.60) KJ/mol. These results indicated that the heterogeneous uptake of acrylic acid on ATD surface was sensitive to temperature. The heterogeneous uptake on ATD could affect the concentration of acrylic acid in the atmosphere, especially at low temperature.
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: liuqifan@iccas.ac.cn.
authors.forename: Qifan
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yidan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, 100081, China. Electronic address: wulingyan@camscma.cn.
authors.forename: Lingyan
authors.initials: L
authors.lastname: Wu
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Jing
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Shengrui
authors.initials: S
authors.lastname: Tong
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Weigang
authors.initials: W
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: gemaofa@iccas.ac.cn.
authors.forename: Maofa
authors.initials: M
authors.lastname: Ge
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D000327:Adsorption; D001130:Arizona; D004391:Dust / Q000032:analysis*; D007700:Kinetics; D008956:Models, Chemical; D013696:Temperature; D013816:Thermodynamics
chemical_list: D000179:Acrylates; D004391:Dust; C036658:acrylic acid
keywords: Acrylic acid; Heterogeneous uptake; Knudsen cell; Uptake coefficients