Recent progress in photocatalytic degradation of chlorinated phenols and reduction of heavy metal ions in water by TiO2-based catalysts

Ayoola Shoneye, Jang Sen Chang, Meng Nan Chong, Junwang Tang

Research output: Contribution to journalReview ArticleResearchpeer-review

56 Citations (Scopus)

Abstract

Among the various semiconductor photocatalysts reported so far, TiO2 is still the most promising material for real applications because of its excellent chemical and thermal stability, non-toxicity, low cost and highly oxidising photogenerated holes. This review summarises the recent progress (mainly over the last five years) in photocatalytic oxidation of non-biodegradable organic pollutants (chlorophenols) and reduction of toxic heavy metal ions in aqueous solution. The review details the recently developed strategies for improving the performance of TiO2-based photocatalysts, with particular respect to the visible light activity, charge separation efficiency, stability, separability and adsorption capacity for the remediation of the aforementioned categories of water contaminants, as these factors heavily affect the practical application of this technology. Next, the underlying semiconductor photocatalytic mechanisms have been thoroughly addressed experimentally and theoretically, together with the proposed defect engineering to improve the photocatalytic performance. Finally, the prospect of TiO2 photocatalysis was discussed.

Original languageEnglish
Pages (from-to)47-64
Number of pages18
JournalInternational Materials Reviews
Volume67
Issue number1
DOIs
Publication statusPublished - 2022

Keywords

  • chlorophenols
  • heavy metal
  • Photocatalysis
  • TiO-based catalysts
  • water treatment

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