Efficient Visible-Light Photocatalytic Cycloaddition of CO2and Propylene Oxide Using Reduced Graphene Oxide Supported BiNbO4

Maram Bakiro, Salwa Hussein Ahmed, Ahmed Alzamly

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this study, a series of novel BiNbO4 and BiNbO4/reduced graphene oxide (BiNbO4/r-GO) visible-light photocatalysts were prepared. Pure BiNbO4 was prepared by simple co-precipitation; on the other hand, BiNbO4/r-GO composites were prepared by simple mechanical mixing, followed by hydrothermal treatment. The effect of r-GO on the structural, surface morphological, and optical properties of the prepared photocatalysts was investigated using ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy (UV-vis DRS), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) for the determination of the specific surface area and porosity and energy-dispersive X-ray spectroscopy (EDX) for determining the elemental composition. A red shift in optical band gap measurements was observed with the increasing r-GO mass percentage in the prepared BiNbO4/r-GO composites. Photocatalytic activities of pure BiNbO4 and the composites were evaluated using the photocatalytic cycloaddition of carbon dioxide to propylene oxide as a model reaction. All the prepared photocatalysts produced cyclic propylene carbonate selectively with no polymeric material observed. The highest photocatalytic efficiency was achieved using BiNbO4/5% r-GO composite photocatalyst, where the mass percentage of r-GO was 5%.

Original languageEnglish
Pages (from-to)12072-12079
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number32
DOIs
Publication statusPublished - Aug 17 2020

Keywords

  • BiNbO/r-GO composites
  • COcycloaddition
  • band gap
  • photocatalyst
  • red shift
  • visible light

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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