Carbon quantum dot supported semiconductor photocatalysts for efficient degradation of organic pollutants in water: A review

Sheetal Sharma, Vishal Dutta, Pardeep Singh*, Pankaj Raizada, Abolfazl Rahmani-Sani, Ahmad Hosseini-Bandegharaei, Vijay Kumar Thakur

*Corresponding author for this work

Research output: Contribution to journalReview article

70 Citations (Scopus)

Abstract

Semiconductor photocatalyst mediated advanced oxidation processes are regarded as one of the most efficient technologies to mitigate organic pollutants in water. However, poor activity under visible light and the recombination of photogenerated electron and hole pairs hinder large scale applicability of semiconductor photocatalysts for water purification. The modification of semiconductor photocatalysts with carbon quantum dots (CQDs)is of high importance due to low toxicity, aqueous stability, enhanced surface area, economic feasibility, good biocompatibility and chemical inertness of CQDs. In this review, we highlight strategies to improve the activity of conventional semiconductor photocatalysts via coupling with CQDs. The enhanced photocatalytic activity of CQD modified narrow and wide band gap photocatalysts is due mainly to up-conversion photoluminescence (UPCL)and the electron reservoir properties of CQDs, while in the case of Z-scheme photocatalysts CQDs act as an electron mediator. Finally, a conclusive outlook and suggested research directions are provided to address challenges such as the inadequate separation of photoinduced charge carriers.

Original languageEnglish
Pages (from-to)755-769
Number of pages15
JournalJournal of Cleaner Production
Volume228
DOIs
Publication statusPrint publication - 10 Aug 2019
Externally publishedYes

Keywords

  • Carbon quantum dots modified photocatalysts
  • Improved photocatalytic activity
  • Limitations of conventional photocatalysts
  • Semiconductor photocatalysis
  • Wastewater treatment

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