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Sci Total Environ

Title:		VOCs adsorption on activated carbon with initial water vapor contents: Adsorption mechanism and modified characteristic curves
Author(s):		Jia L; Shi J; Long C; Lian F; Xing B;
Address:		"State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China; Department of Applied Chemistry, Yuncheng University, 1155 Fudan West Street, Yuncheng 044000, China; Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA. Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China. Electronic address: clong@nju.edu.cn. Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China. Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA"
Journal Title:		Sci Total Environ
Year:		2020
Volume:		20200504
Issue:
Page Number:		139184 -
DOI:		10.1016/j.scitotenv.2020.139184
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"In practice, regeneration of adsorbent is always achieved by heating with hot steam, leaving some water in the adsorbent bed, which may negatively affect the VOCs adsorption. In this research, adsorption isotherms of 12 VOCs (ketones, alkanes, alcohols, halohydrocarbons, and aromatic hydrocarbons) on granular activated carbon (GAC) with different initial water contents (IWC) were conducted. Adsorption interactions between VOCs and GAC at different IWC were investigated using the combination of Linear Solvation Energy Relationship (LSER) and Dubinin-Radushkevich (DR) equation. The results showed that initial water vapor could reduce adsorption capacities and partition coefficient of 12 VOCs, especially at low VOCs concentration. According to LSER, electron acceptor ability ( summation operatorbeta(2)(H)) and dispersive force (log(10)L(16)) of VOCs played major roles during adsorption. For VOCs with approximate summation operatorbeta(2)(H) value in the same series, the negative influence of IWC was less obvious for VOCs with higher log(10)L(16), while for VOCs with similar log(10)L(16) value in different series, the negative influence of IWC was more significant for VOCs with higher summation operatorbeta(2)(H). Furthermore, characteristic curves of 12 VOCs onto dry GAC, i.e., the plots of adsorbed volume (q(v)) vs adsorption potential density (epsilon/V(m)), fell essentially onto a single curve with a high correlation coefficient, while on GAC with IWC, characteristic curves of 12 VOCs had obvious discrepancy. Considering the effect of IWC, the contribution percentage of dispersive force (W(d)) to VOCs adsorption was introduced to modify adsorbed volume (q(v)) in DR equation and W(d).q(v) was used instead of q(v). Then, the integrative characteristic adsorption curves of 12 VOCs on GAC with initial water could be modified well and they showed better superposition with higher fitting coefficient of DR equation. The results are meaningful to estimate adsorption capacities for other VOCs adsorption onto GAC within the range of IWC in this study"
Keywords:		Carbon Characteristic adsorption curves Initial water vapor Lser Volatile organic compounds;
Notes:		"PubMed-not-MEDLINEJia, Lijuan Shi, Jialu Long, Chao Lian, Fei Xing, Baoshan eng Netherlands 2020/05/14 Sci Total Environ. 2020 Aug 20; 731:139184. doi: 10.1016/j.scitotenv.2020.139184. Epub 2020 May 4"