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Mechanistic investigations in sonochemical degradation of trihalomethanes in presence of non-porous and mesoporous silica nanospheres

Authors
Park, BeomgukQiu, PengpengThokchom, BinotaMoholkar, Vijayanand S.Son, YounggyuKhim, Jeehyeong
Issue Date
8월-2018
Publisher
ELSEVIER SCIENCE BV
Keywords
Advanced oxidation process; Trihalomethane; Sonolysis; Cavitation bubble dynamics
Citation
JOURNAL OF WATER PROCESS ENGINEERING, v.24, pp.26 - 34
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF WATER PROCESS ENGINEERING
Volume
24
Start Page
26
End Page
34
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/131763
DOI
10.1016/j.jwpe.2018.05.005
ISSN
2214-7144
Abstract
This study reports mechanistic investigations in sonochemical degradation of four Trihalomethanes (THMs), viz. CHCl3, CHCl2Br, CHClBr2 and CHBr3, in presence of non-porous and mesoporous silica nanospheres. Degradation reactions of THMs were carried out under identical conditions with addition of silica nanospheres. Concurrently, simulations of cavitation bubble dynamics were carried out. Mesoporous silica nanospheres with the largest surface area and the highest mean pore diameter yielded the highest enhancement in degradation of the THMs. These results were also corroborated by H2O2 dosimetry. The concentration profiles of the THMs were fitted to pseudo 1st order kinetic model. Although mean pore sizes of mesoporous silica nanospheres were smaller than minimum threshold radius for transient cavitation, these nanospheres provided surface-induced and pore-induced nucleation to augment cavitation bubble population in medium. The highest nanosphere-induced enhancement in degradation was obtained for CHBr3, while the highest total degradation was obtained for CHCl3. With concurrent analysis of experimental and simulations results, an attempt is made to deduce the predominant physical mechanism of degradation of the THMs.
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Khim, Jee hyeong
공과대학 (건축사회환경공학부)
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