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The unique features of non-competitive vs. competitive sorption: Tests against single volatile aromatic hydrocarbons and their quaternary mixtures

Title
The unique features of non-competitive vs. competitive sorption: Tests against single volatile aromatic hydrocarbons and their quaternary mixtures
Author
김기현
Keywords
Activated carbon; Aromatic VOCs; Adsorption; Langmuir; Henry's constant; Retrograde
Issue Date
2019-06
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
Environmental Research, v. 173, Page. 508-516
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 Pa partial pressures (e.g., 0-100 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 Pa). In the former, the values were approximately 123, 184, 272, and 238 mg g(-1), respectively. In contrast, the latter values were 5, 52, 222, and 248 mg 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 Pa, retrograde), intermediate (1-4 Pa), and high (4-10 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 K.
URI
https://www.sciencedirect.com/science/article/pii/S0013935119301744?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/151843
ISSN
0013-9351; 1096-0953
DOI
10.1016/j.envres.2019.03.046
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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