Dynamic and thermodynamic mechanisms of TFA adsorption by particulate   matter

doi:10.1016/j.envpol.2017.03.049

CORC > 北京大学 > 环境科学与工程学院

	Dynamic and thermodynamic mechanisms of TFA adsorption by particulate matter
	Guo, Junyu ; Zhai, Zihan ; Wang, Lei ; Wang, Ziyuan ; Wu, Jing ; Zhang, Boya ; Zhang, Jianbo
刊名	ENVIRONMENTAL POLLUTION
	2017
关键词	Adsorption Particulate matter Langmuir isotherm model Kinetic model Trifluoroacetic acid TRIFLUOROACETIC-ACID HALOACETIC ACIDS AQUATIC ENVIRONMENT PART I DEGRADATION SORPTION CHINA FATE ACCUMULATION TOXICITY
DOI	10.1016/j.envpol.2017.03.049
英文摘要	Trifluoroacetic acid (TFA) in the atmosphere is produced by degradation of hydrochlorofluorocarbons and hydrofluorocarbons. In recent years, TFA has attracted global attention because of increased environmental concentrations, biological toxicity and accumulation in aqueous environments. This study focused on the mechanisms underlying the adsorption of TFA by particulate matter to identify the appropriate descriptive model for this process and thus improve estimation of TFA adsorption in future environmental monitoring. Onsite gas and particle phase sampling in Beijing, China, and subsequent measurement of TFA concentrations indicated that the TFA concentration in the gas phase (1396 +/- 225 pg m(-3)) was much higher than that in the particle phase (62 8 pg m-3) and that monthly concentrations varied seasonally with temperature. Based on the field results and analysis, an adsorption experiment of TFA on soot was then conducted at three different temperatures (293, 303, and 313 K) to provide parameters for kinetic and thermodynamic modelling. The proportion of atmospheric TFA concentration in the gas phase increased with temperature, indicating that temperature affected the phase distribution of TFA. The subsequent kinetic and thermodynamic modelling showed that the adsorption of TFA by soot could be described well by the Bangham kinetic model. The adsorption was controlled by diffusion, and the key mechanism was physical adsorption. The adsorption behavior can be well described by the Langmuir isotherm model. The calculated thermodynamic parameters AG (-2.34, -1.25, and -0.15 kJ mol(-1) at 293, 303, and 313 K, respectively), AH degrees(-34.34 kJ mol(-1)), and AS (-109.22 J mol(-1) K-1) for TFA adsorption by soot were negative, indicating that adsorption was a spontaneous, exothermic process. (C) 2017 Elsevier Ltd. All rights reserved.; National Natural Science Foundation of China [41275156, 41575140]; SCI(E); ARTICLE; 175-183; 225
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/473196]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Guo, Junyu,Zhai, Zihan,Wang, Lei,et al. Dynamic and thermodynamic mechanisms of TFA adsorption by particulate matter[J]. ENVIRONMENTAL POLLUTION,2017.
APA	Guo, Junyu.,Zhai, Zihan.,Wang, Lei.,Wang, Ziyuan.,Wu, Jing.,...&Zhang, Jianbo.(2017).Dynamic and thermodynamic mechanisms of TFA adsorption by particulate matter.ENVIRONMENTAL POLLUTION.
MLA	Guo, Junyu,et al."Dynamic and thermodynamic mechanisms of TFA adsorption by particulate matter".ENVIRONMENTAL POLLUTION (2017).