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

Beomguk Park, Pengpeng Qiu, Binota Thokchom, Vijayanand S. Moholkar, Younggyu Son, Jeehyeong Khim

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)26-34
Number of pages9
JournalJournal of Water Process Engineering
Volume24
DOIs
Publication statusPublished - 2018 Aug 1

Keywords

  • Advanced oxidation process
  • Cavitation bubble dynamics
  • Sonolysis
  • Trihalomethane

ASJC Scopus subject areas

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

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