Synergistic oxidation of Bisphenol A in a heterogeneous ultrasound-enhanced sludge biochar catalyst/persulfate process: Reactivity and mechanism

Zeng Hui Diao, Fu Xin Dong, Liu Yan, Zhi Liang Chen, Wei Qian, Ling Jun Kong, Zai Wang Zhang, Tao Zhang, Xue Qin Tao, Jian Jun Du, Dan Jiang, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)

Abstract

Recently, clean-up of resistant organic compounds has attracted growing attention. In this study, a novel heterogeneous ultrasound-enhanced sludge biochar catalyst/persulfate (BC/PS/US) process was firstly developed for the degradation of bisphenol A (BPA) in water. The results revealed that BC/PS/US process could successfully achieve a positively synergistic effect between sonochemistry and catalytic chemistry on the degradation of BPA compared to its corresponding comparative process. Nearly 98% of BPA could be degraded within 80 min at optimum reaction conditions. The coexisting substances including Cl, SO42- and NO3 had no obvious inhibition on the BPA degradation, whereas HCO3 and humic acid (HA) had significant inhibition effects on that. PS decomposition of BC/PS/US process was superior to that of BC/PS or US/PS process. Both SO4[rad] and HO[rad] participated in the degradation of BPA, but SO4[rad] was predominant radical in the BC/PS/US process. A possible pathway of BPA degradation was proposed, and the BPA molecule was attacked by SO4[rad] and degraded into five kinds of intermediate products through hydroxylation and demethylation processes. This study helps to comprehend the application of sludge biochar catalyst as a persulfate activator for the degradation of organic compounds under ultrasound irradiation, and provides a new strategy in wastewater treatment.

Original languageEnglish
Article number121385
JournalJournal of Hazardous Materials
Volume384
DOIs
Publication statusPublished - 15 Feb 2020

Keywords

  • Bisphenol A
  • Fenton
  • Persulfate
  • Sludge biochar
  • Ultrasound

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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