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Environ Res

Title:		The unique features of non-competitive vs. competitive sorption: Tests against single volatile aromatic hydrocarbons and their quaternary mixtures
Author(s):		Samaddar P; Kim KH; Yip ACK; Zhang M; Szulejko JE; Khan A;
Address:		"Department of Civil & Environmental Engineering, Hanyang University, Seoul, 04763, South Korea. Department of Civil & Environmental Engineering, Hanyang University, Seoul, 04763, South Korea. Electronic address: kkim61@hanyang.ac.kr. Department of Chemical and Process Engineering, The University of Canterbury, Christchurch, New Zealand. Department of Environmental Engineering, China Jiliang University, Hangzhou, 310018, China. Department of Civil Engineering, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan"
Journal Title:		Environ Res
Year:		2019
Volume:		20190322
Issue:
Page Number:		508 - 516
DOI:		10.1016/j.envres.2019.03.046
ISSN/ISBN:		1096-0953 (Electronic) 0013-9351 (Linking)
Abstract:		"The adsorption characteristics of four aromatic hydrocarbons (i.e., benzene, toluene, xylene, and styrene) onto ground-activated carbon were investigated both independently and as a mixture of the four at <10?ª+Pa partial pressures (e.g., 0-100?ª+ppm concentration range). The maximum sorption capacities for benzene, toluene, styrene, and xylene were measured both as a sole component and as a mixture (at 10?ª+Pa). In the former, the values were approximately 123, 184, 272, and 238?ª+mg?ª+g(-1), respectively. In contrast, the latter values were 5, 52, 222, and 248?ª+mg?ª+g(-1) respectively, showing dramatic reduction in lighter compounds (below C7) relative to heavier ones (above C8). The mechanistic detail of sorption has been explained in terms of Henry's law and Langmuir, Freundlich, Dubinin-Radushkevich, and Elovich isotherm models. The linearized Langmuir adsorption isotherm analysis showed three sorption pressure regions: low (<1?ª+Pa, retrograde), intermediate (1-4?ª+Pa), and high (4-10?ª+Pa). As such, the outcome of this study offers a unique opportunity to acquire detailed information on the dramatic and dynamic effects of the sorptive interaction between competing sorbates, along with a common sorption process between sorbent and sorbate at 298?ª+K"
Keywords:		"Adsorption Benzene *Hydrocarbons *Models, Chemical Toluene *Volatile Organic Compounds Activated carbon Aromatic VOCs Henry's constant Langmuir Retrograde;"
Notes:		"MedlineSamaddar, Pallabi Kim, Ki-Hyun Yip, Alex C K Zhang, Ming Szulejko, Jan E Khan, Azmatullah eng Research Support, Non-U.S. Gov't Netherlands 2019/04/17 Environ Res. 2019 Jun; 173:508-516. doi: 10.1016/j.envres.2019.03.046. Epub 2019 Mar 22"