A review on persulfates activation by functional biochar for organic contaminants removal: Synthesis, characterizations, radical determination, and mechanism

Chongqing Wang, Rong Huang, Ruirui Sun, Jiapeng Yang, Mika Sillanpää

Research output: Contribution to journalReview articlepeer-review

147 Citations (Scopus)

Abstract

In recent years, refractory organic pollutants (ROPs) have been progressively detected in wastewater. Persulfates (peroxymonosulfate and peroxydisulfate)-based advanced oxidation processes (PS-AOPs) are efficient for ROPs degradation. Biochar and its composites, which have the dual advantages of adsorption and catalysis, have been widely used in PS-AOPs. Research advances on PS activation by biochar-based materials are systematically summarized, including biochar modifications, characterizations, radical determinations, and catalytic mechanism. Biochar modifications applied to PS-AOPs are introduced involving morphology regulation, heteroatomic doping, and metals loading. Characterization techniques are described to reveal the physicochemical properties of biochar-based catalysts. Various methods for radical determinations are discussed. The catalytic mechanism in the PS-AOPs is depicted from the point of radical pathway and non-radical pathway. Based on current knowledge, the perspectives and challenges that may be encountered in basic research and practical applications are put forward. This review offers novel insights into catalyst design and better understanding of PS-AOPs.

Original languageEnglish
Article number106267
JournalJournal of Environmental Chemical Engineering
Volume9
Issue number5
DOIs
Publication statusPublished - Oct 2021
Externally publishedYes

Keywords

  • Biochar
  • Non-radical pathway
  • Persulfates
  • Radical determination
  • Refractory organic pollutants

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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