Efficient microwave-assisted mineralization of oxytetracycline driven by persulfate and hypochlorite over Cu-biochar catalyst

Qiaozhi Zhang, Yuqing Sun, Weijian Xu, Yang Cao, Chunfei Wu, Chi Hwa Wang, Daniel C.W. Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)

Abstract

Microwave (MW)-assisted catalytic degradation of organic pollutants draws increasing attention owing to its high efficiency in wastewater treatment. This work developed Cu-loaded biochar (CuBC) catalysts for time-efficient mineralization of refractory and high-concentration oxytetracycline (OTC). With only 1 min at 80 °C, Na2S2O8 achieved 100% total organic carbon (TOC) removal over the Cu5BC, while NaClO mineralized 73.3% TOC over the metal-free BC, in contrast to a relatively low mineralization efficiency (< 35%) achieved by H2O2. The high efficiency in MW-assisted oxidation systems could be ascribed to reactive oxidizing species (SO4 or ClO), which otherwise were barely detectable in a conventional heating system. The interactions between CuBC and MW were revealed by correlating the physiochemical characteristics to the MW absorption ability. The proposed catalytic systems can contribute to the development of a high-throughput and low-carbon wastewater treatment technology.

Original languageEnglish
Article number128698
JournalBioresource Technology
Volume372
DOIs
Publication statusPublished - Mar 2023

Keywords

  • Advanced oxidation
  • Engineered biochar
  • Industrial wastewater treatment
  • Microwave activation
  • Pharmaceuticals and personal care products

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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