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Environ Res

Title:		Evidence of inter-species swing adsorption between aromatic hydrocarbons
Author(s):		Vikrant K; Kim KH; Szulejko JE; Boukhvalov D; Shang J; Rinklebe J;
Address:		"Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr. College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing, 210037, PR China; Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002, Ekaterinburg, Russia. School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China. University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstrasse 7, Wuppertal, 42285, Germany; Department of Environment, Energy and Geoinformatics, Sejong University, 98 Gunja-Dong, Seoul, Republic of Korea. Electronic address: rinklebe@uni-wuppertal.de"
Journal Title:		Environ Res
Year:		2020
Volume:		20191012
Issue:
Page Number:		108814 -
DOI:		10.1016/j.envres.2019.108814
ISSN/ISBN:		1096-0953 (Electronic) 0013-9351 (Linking)
Abstract:		"In this research, the competitive adsorption characteristics between aromatic hydrocarbons were investigated. It is well-known that an industrial effluent may contain a mixture of pollutants. The composition of effluents is usually highly variable in nature to depend upon the feedstock. Hence, one of the pollutants that is present in larger amounts may have the potential to dominate the sorption processes. Although many studies have investigated the competitive adsorption of volatile organic compounds (VOCs) onto activated carbon (AC) in detail, little is known about how the overall process is influenced when a fresh incoming VOC molecule encounters a sorbent bed pre-loaded with other VOCs. Consequently, the objective of the present study was to investigate the stability of pre-adsorbed VOC molecules in the presence of other potentially competitive VOCs in the influent stream. In this regard, the sorbent bed of AC was first preloaded with benzene (50?ª+ppm (0.16?ª+mg?ª+L(-1))) and subsequently challenged by either high purity nitrogen or a stream of xylene (at 10, 50, or 100?ª+ppm (0.043, 0.22, or 0.43?ª+mg?ª+L(-1))). The desorption rate of preloaded benzene and uptake rate of challenger xylene were assessed simultaneously. The maximum desorption rates of benzene (R(b)) against two challenge scenarios (e.g., 100?ª+ppm (0.43?ª+mg?ª+L(-1)) xylene and pure N(2)) were very different from each other, i.e., 663 vs. 257?ª+g?ª+kg(-1) h(-1), and their final benzene recoveries were 84% and 42%, respectively. The initially high desorption rate for the former quickly decreased with decreasing benzene residual capacity (C, mg g(-1)). Interestingly, the adsorption capacity of xylene increased considerably after the preloading of benzene (relative to no preloading). As such, 10% breakthrough volumes (BTV10) of 100, 50, and 10?ª+ppm (0.43, 0.22, and 0.043?ª+mg?ª+L(-1)) xylene challenge scenarios increased significantly from 100 to 186, 43.4 to 694, and 600 to 1000?ª+L?ª+atm g(-1), respectively. The prevalent mechanisms were analyzed using density functional theory (DFT)-based modelling approaches. The results demonstrated effective replacement of pre-adsorbed molecules with weaker affinity (e.g., benzene) when challenged by molecules with stronger affinity (e.g., xylene) toward the sorbent; this was accompanied by noticeable synergistic enhancement in the adsorption capacity of the latter"
Keywords:		"Adsorption Benzene Charcoal *Hydrocarbons, Aromatic *Volatile Organic Compounds Desorption Gas chromatography Pollution control VOCs;"
Notes:		"MedlineVikrant, Kumar Kim, Ki-Hyun Szulejko, Jan E Boukhvalov, Danil Shang, Jin Rinklebe, Jorg eng Research Support, Non-U.S. Gov't Netherlands 2019/12/01 Environ Res. 2020 Feb; 181:108814. doi: 10.1016/j.envres.2019.108814. Epub 2019 Oct 12"