Efficient degradation of bisphenol A using High-Frequency Ultrasound: Analysis of influencing factors and mechanistic investigation

Liang Meng, Lu Gan, Han Gong, Jun Su, Ping Wang, Wei Li, Wei Chu, Lijie Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

The environmentally friendly technology of high-frequency ultrasonic processes with the mostly concerned frequencies of 200 kHz and 400 kHz were applied and investigated systematically for BPA degradation in both pure water and river water mediated conditions. Investigations were carried out examining the effects of crucial parameters determining the system efficiency and BPA degradation mechanisms. Results proved that BPA was efficiently degraded via the oxidation by •OH. The 400 kHz ultrasonic process demonstrated much stronger capability in generating •OH and corresponding higher efficiency in BPA degradation based on electron spin resonance analysis. Increasing solution volume could increase the radical yields, and the temperature increase rate (dT/dt) showed linear relationship with kobs. In addition, the degradation of BPA with different concentrations was for the first time found controlled by different limiting factors, in which the degradation only with higher concentrations (≥0.02 mM) conformed to the Langmuir–Hinshelwood mechanism. More acidic condition and the bulk temperature of about 40 °C favored BPA degradation. The presence of NO3 , SO4 2−, and Cl demonstrated minor influence while CO3 2−, HCO3 and NO2 showed significant inhibition, and the effects of different anions also depended on their concentrations. The degradation rate decreased 23% when river water was used as the matrix. Furthermore, both hydroxylation of the benzene ring and attack on the connecting carbon were found to be the reaction pathways, and the latter was proposed to be more dominant.

Original languageEnglish
Pages (from-to)1195-1203
Number of pages9
JournalJournal of Cleaner Production
Volume232
DOIs
Publication statusPublished - 20 Sep 2019

Keywords

  • Bisphenol A
  • Degradation mechanism
  • High frequency ultrasound
  • Radicals
  • Temperature

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Strategy and Management
  • Industrial and Manufacturing Engineering

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