TY - JOUR
T1 - Mechanistic investigations in sonochemical degradation of trihalomethanes in presence of non–porous and mesoporous silica nanospheres
AU - Park, Beomguk
AU - Qiu, Pengpeng
AU - Thokchom, Binota
AU - Moholkar, Vijayanand S.
AU - Son, Younggyu
AU - Khim, Jeehyeong
N1 - Funding Information:
This study was supported by a Korea University Grant and the Korean Ministry of the Environment as the Geo–Advanced Innovative Action (GAIA) Project (No. Q1509291 ). Authors would like to thank Mr. Ritesh Malani for his assistance in revision of the manuscript. Authors are also grateful to anonymous referees for their meticulous evaluation of the manuscript and constructive criticism.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/8
Y1 - 2018/8
N2 - 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.
AB - 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.
KW - Advanced oxidation process
KW - Cavitation bubble dynamics
KW - Sonolysis
KW - Trihalomethane
UR - http://www.scopus.com/inward/record.url?scp=85046792863&partnerID=8YFLogxK
U2 - 10.1016/j.jwpe.2018.05.005
DO - 10.1016/j.jwpe.2018.05.005
M3 - Article
AN - SCOPUS:85046792863
SN - 2214-7144
VL - 24
SP - 26
EP - 34
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
ER -