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J Hazard Mater

Title:		Enhanced adsorption of benzene vapor on granular activated carbon under humid conditions due to shifts in hydrophobicity and total micropore volume
Author(s):		Liu HB; Yang B; Xue ND;
Address:		"State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: xuend@craes.org.cn"
Journal Title:		J Hazard Mater
Year:		2016
Volume:		20160711
Issue:
Page Number:		425 - 432
DOI:		10.1016/j.jhazmat.2016.07.026
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"A series of hydrophobic-modified (polydimethylsiloxane (PDMS) coating) activated carbons (ACs) were developed to answer a fundamental question: what are the determinants that dominate the adsorption on ACs under humid conditions? Using column experiments, an inter-comparison among bare-AC and PDMS-coated ACs was conducted regarding the association of surface characteristics and adsorption capacity. Primary outcomes occurred in two dominating markers, hydrophobicity and total micropore volume, which played a key role in water adsorption on ACs. However, their contributions to water adsorption on ACs substantially differed under different Pwater/Pair conditions. Hydrophobicity was the only contributor in Pwater/Pair=0.1-0.6, while the two markers contributed equally in Pwater/Pair=0.7-1.0. Furthermore, PDMS-coated AC had a significant increase in benzene adsorption capacities compared to bare-AC at 0-90% relative humidity, while these differences were not significant among PDMS-coated ACs. It is thus presumed that the balance between the two markers can be shifted to favor almost unchanged benzene adsorption capacities among PDMS-coated ACs over a large range of relative humidity. These findings suggest potential benefits of PDMS coating onto ACs in enhancing selective adsorption of hydrophobic volatile organic compounds under high humid conditions. To develop new porous materials with both high total micropore volume and hydrophobicity should thus be considered"
Keywords:		Adsorption capacity Granular activated carbon PDMS coating Surface hydrophobicity Volatile organic compounds;
Notes:		"PubMed-not-MEDLINELiu, Han-Bing Yang, Bing Xue, Nan-Dong eng Netherlands 2016/07/28 J Hazard Mater. 2016 Nov 15; 318:425-432. doi: 10.1016/j.jhazmat.2016.07.026. Epub 2016 Jul 11"