Microwave-Assisted Synthesis of Cobalt Oxide/Reduced Graphene Oxide (Co3O4–rGo) Composite and its Sulfite Enhanced Photocatalytic Degradation of Organic Dyes

Author:

Bankole Owolabi M.1,Olaseni Segun E.2,Adeyemo Moses A.2,Ogunlaja Adeniyi S.3

Affiliation:

1. Hydrochemistry Research Laboratory , Adekunle Ajasin University , Akungba , Nigeria , Phone: +2348034018955

2. Hydrochemistry Research Laboratory , Adekunle Ajasin University , Akungba , Nigeria

3. Department of Chemistry , Nelson Mandela University , Port Elizabeth , South Africa

Abstract

Abstract One-pot synthesis of Co3O4 nanocrystals on reduced graphene oxide (rGO) was carried out by reacting cobalt nitrate, L-arginine, extract of Laportae aestuans as oxidant, fuel and reducing agent, respectively, in a domestic microwave. Morphologies of Co3O4–rGo (RGCO) composite was elucidated using UV-Vis, FT-IR, TEM, SEM, EDX, XRD and photoluminescence spectroscopies. The synthesized RGCO composite was applied as heterogeneous photocatalyst in the activation of Na2SO3 (sulfite) as sacrificial agent to degrade cationic dyes: rhodamine B (RhB) and methylene blue (MB), under visible light, at neutral pH 7.0. Photocatalytic performance of as-prepared RGCO was significantly enhanced in the presence of Na2SO3. Enhanced photocatalytic activity of RGCO was attributed to the synergistic effects between sulfite radicals generated in situ, and reduced graphene oxide, in which rGO served as electron sink to suppress recombination of photogenerated charge carriers. Plausible mechanistic pathways responsible for the activation of sulfite anions in situ are presented in this paper.

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry

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