Synthesis and Characterisation of Graphitic Carbon Nitride G C3n4 and Metal Oxide Nanocomposites Zno Nio Mno2 and their Photocatalytic Studies

Abstract

With rapid urban and social development, environmental pollution and energy needs have become two major global challenges, which are attracting attention of research. Visible light driven photocatalytic technique offer a promising way to solve these problems. As a new technique utilizing visible energy, semiconducting photocatalysts are becoming the centre of scientific research due to its environmentally friendly and energy efficient properties. In recent years, various semiconductor photocatalysts including ZnO, MnO2, NiO, TiO2 have been extensively studied in variety of applications in newlineand#10070; Hydrogen production newlineand#10070; CO2 reduction newlineand#10070; Solar cells newlineand#10070; Photocatalytic dye degradation newlineIn the present work, I have done photocatalytic dye degradation using metal oxide nanocomposites. Generally, metal oxides having higher recombination rate of photocatalytic charge carriers are caused by weaker Vander Waals interaction between the metal oxide, a smaller specific area and lower visible light absorption, bare metal oxides prevents its practical applications. Various techniques, like doping, coating, non-metallic stimulants have been developed to improve the photocatalytic activity of the metal oxides. In my research work, I have prepared g-C3N4 based nanocomposite i.e, small addition of g-C3N4 significantly improve the efficiency of metal oxides during photocatalytic reaction. As a non-metallic semiconductor with the usual two dimensional structure, g-C3N4 has received much attention. Since 2009, Wang et al, shows that g-C3N4 exhibits excellent degradation efficiency in solar water splitting under visible light irradiation. These discoveries contributed to the evidence that g-C3N4 has a ring structure of Tri-s-triazine and has relatively high thermal and chemical stability with suitable band gap (2.7 eV) newline