Visible-Light- Driven Photocatalyst Using LaNi03/rGO Composite for The Degradation of Environmental Pollutants

Abstract

In this study the facile hydrothermal method was used to fabricate pristine LaNi 0 3 and LaNi03/rGO composites. Three composites were prepared by altering rGO content in the composite. Various characterization teclmiques were utilized to investigate the physical properties of as-fabricated sample including Powder X-ray diffraction (PXRD), Scanning electron microscopy (SEM) and Energy-dispersive X-ray (EDX). Band gap (Eg) energy were calculated from UV -visible absorbance spectra using tauc plots. The photocatalytic performance of LaNi03lrGO composite was evaluated by degrading BPA and Cr(VI) reduction under visible light irradiation. Among all of the synthesized photocatalysts, it was proved that 10% LaNi03lrGO composite was an outstanding photocatalyst for degradation of BP A and Cr (VI) reduction than the other reported photocatalysts. The photooxidation activity and stability of LaNi03 was enhanced when rGO was incorporated in LaNi03.Complete degradation of 10 ppm bisphenol A and reduction of Cr(VI) solutions were achieved in 30min by using 30 mg of 10% LaNi03/rGO photocatalyst. Degradation of bisphenol A and reduction of Cr(VI) solutions with 10% LaNi03/rGO photocatalyst follows first-order kinetics. The LaNi03lrGO composite exhibited the outstanding stability up to five cycles.