Studies of MnO2/g-C3N4 hetrostructure efficient of visible light photocatalyst for pollutants degradation by sol-gel technique

Abstract

MnO2 and g-C3N4 heterostructure were constructed by simple sol-gel technique combined with annealing process were characterized different variety of techniques to understand the structural, morphological, optical and elemental composition were using XRD, TEM, Raman, UV, PL, BET and EDAX analysis. In fact, XRD and FESEM results shows that α-phase MnO2 structure were individually spherical shaped - like morphology nanostructures the average diameter 25 nm to 40 nm was observed apparently. In order to understand, the optical bandgap properties and specific surface area of MnO2/g-C3N4 nanocomposites were ranging from 2.55 eV - 2.78 eV & 67.23 - 105.21 m2/g, which is confirmed through UV–vis DRS and N2 nitrogen absorption desorption study. Therefore, the photocatalytic activity of the photocatalysts were estimated by degradation effect of methyl orange (MO) and toxic phenol pollutants. Among the results reveal that the MnO2/g-C3N4 hybrid catalyst have showed to owing the degradation effect 98% and high stability (only loss 3.5%) towards phenol dye concentration. This can be attributed to the separation of photogenerated electron-hole (e−/h+) pairs, overwhelms the recombination of free charges were reported in detail.