Jump to main content
Jump to site search

Issue 23, 2018
Previous Article Next Article

Pyrophosphate effect on the photocatalytic degradation of phenol over bare and Pt-deposited Bi2WO6

Author affiliations

Abstract

Pyrophosphate anions (PPA) are widely present in wastewater, but their effect on semiconductor photocatalyis for organic degradation has not been established yet. In this study, we report a synergistic effect between Pt and PPA, that greatly improves photocatalytic activity of Bi2WO6 (BiW) for phenol degradation in aqueous solutions at pHs 5–11. BiW was synthesized by a hydrothermal method, followed by photochemical deposition of 0.5% Pt (Pt/BiW). Upon addition of PPA, rates of phenol degradation on BiW and Pt/BiW decreased and increased, respectively. The former is due to decreased O2 adsorption, as inferred from photocatalytic and electrochemical reductions of O2. (Photo)electrochemical measurements revealed that Pt and PPA act as electron and hole mediators, respectively. It is proposed that adsorbed PPA on the catalyst is first oxidized to a pyrophosphate anion radical, followed by phenol oxidation to regenerate PPA. However, as PPA concentration increased beyond 0.50 mM, rate of phenol degradation on Pt/BiW started to decrease, due to self-recombination of pyrophosphate anion radicals into a less reactive product.

Graphical abstract: Pyrophosphate effect on the photocatalytic degradation of phenol over bare and Pt-deposited Bi2WO6

Back to tab navigation

Supplementary files

Publication details

The article was received on 07 Sep 2018, accepted on 17 Oct 2018 and first published on 18 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ04557G
Citation: New J. Chem., 2018,42, 18873-18880
  •   Request permissions

    Pyrophosphate effect on the photocatalytic degradation of phenol over bare and Pt-deposited Bi2WO6

    J. Meng, J. Zhao, X. Xiong, X. Zhang and Y. Xu, New J. Chem., 2018, 42, 18873
    DOI: 10.1039/C8NJ04557G

Search articles by author

Spotlight

Advertisements