Facile synthesis of nano Zn/Bi - reduced graphene oxide for enhanced photocatalytic elimination of chlorinated organic pollutants under visible light
Zn/Bi mixed metal oxide (MMO) was synthesized by a simple co-precipitation method. Then Zn/Bi-MMO was hydrothermally treated with graphene oxide (GO) to obtain Zn/Bi-RGO co-assembly. XRD pattern confirms the formation of highly pure Zn/Bi-RGO nanoparticles. In the co-assembled Zn/Bi-RGO hybrid, the GO had converted into RGO, which was evidenced by FT-IR, Raman, XPS spectra, etc. UV-Vis DRS spectra infers that the prepared hybrid has significant absorption in the visible light. The photocatalytic studies were conducted using 2-Chlorophenol (2-CP) and 2,4-Dichlorp phenol (2,4-DCP) and the hybrid offered almost complete degradation of pollutants as compared to pure Zn/Bi-MMO. The enhanced photocatalytic activity of Zn/Bi-RGO hybrids is due to the homogeneous distribution of Zn/Bi-MMO over RGO sheets as well as electron transportation efficacy of the RGO sheets. The mechanism of the catalysis is expected to have two key events; namely a charge transfer mechanism, which initiates the reaction, followed by election-hole aided radical mechanism.