Jump to main content
Jump to site search


Bi2WO6/Ag3PO4-Ag Z-scheme heterojunction as new plasmonic visible-light-driven photocatalyst: Performance evaluation and mechanism study

Abstract

The Bi2WO6/Ag3PO4-Ag Z-scheme heterojunction as novel plasmonic visible-light-driven photocatalytic was prepared by ultrasound assisted in situ precipitation and hydrothermal method and further well characterized through the multiple techniques. The photocatalytic performance of synthesized Z-scheme heterojunction was evaluated by degradation of binary mixture of organic pollutants dyes which results displayed superior photocatalytic activity due to the decrease of electron-hole pair recombination rate as well as the enhancement of the diffusion rate of electrons and holes across the Bi2WO6/Ag3PO4/Ag Z-scheme heterojunction interfaces. The synergistic effects of Ag nanoparticles in Bi2WO6/Ag3PO4-Ag Z-scheme heterojunction could improve the photo-stability as well as the recyclability towards dyes decomposition due to its contribution in the separation of electron-hole pairs resulting from the forming Z-scheme heterojunction. This work presents a promising strategy for preparing the novel photocatalysts with the high separation efficiency of charge carriers which provides a new concept for rational design and development of high-efficient photocatalysts. Central composite design (CCD) based on the response surface methodology (RSM) was applied to investigate as well as optimization of the operational parameters on the degradation efficiency which results indicated that compared to pure Bi2WO6 and Ag3PO4, Bi2WO6/Ag3PO4-Ag has superior photodegradation efficiency with 86.90% and 82.04% for MG and AO degradation, respectively. The effect of operational parameters including the initial MG concentration (4-12 mg/L), AO concentration (2-6 mg/L), photocatalyst mass (0.008-0.016 g), irradiation time (60-120 min) and pH (3-9) on the degradation efficiency was investigated which the optimized values were found to be 6.057 of pH, 8.0769 mg/L of MG concentration, 4.038 mg/L of AO concentration, 0.012 g of Bi2WO6/Ag3PO4-Ag and 90.57 min of irradiation time. Finally, the photocatalytic degradation mechanism was proposed and the separation of electron-hole pairs resulting from the forming Z-scheme heterojunction with Ag as plasmonic electron mediator well discussed in details.

Back to tab navigation

Supplementary files

Publication details

The article was received on 12 Oct 2018, accepted on 03 Nov 2018 and first published on 05 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ05195J
Citation: New J. Chem., 2018, Accepted Manuscript
  •   Request permissions

    Bi2WO6/Ag3PO4-Ag Z-scheme heterojunction as new plasmonic visible-light-driven photocatalyst: Performance evaluation and mechanism study

    K. Dashtian, S. Mosleh, M. amiri, M. Ghaedi and R. Jannesar, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ05195J

Search articles by author

Spotlight

Advertisements