Photocatalytic and antibacterial properties of carbonaceous materials coupled NiO nanocomposites

The photocatalytic and antibacterial characteristics of pure NiO (NO), GO, and rGO integrated NiO (GNO and rNO) nanoparticles have been compared in this work. Through the process of chemical precipitation, NO and GNO NPs were created. Through the use of Centella asiatica leaf extract to reduce graphene oxide to rGO, rNO NC was produced utilizing one-pot green synthesis technique. The cubic crystal structure of all the samples shows a clear preferential growth along the (2 0 0) direction. Graphene oxide and reduced graphene oxide blending have a detrimental effect on the crystalline quality of NO. Reduced band gaps for the GNO and rNO samples were observed resulting from charge delocalization from electronic interaction between NiOand GO/rGO. The degradation efficiencies of NO, GNO and rNO catalysts were 78, 83 and and 92 %,respectively against rhodamine B after 100 min of light irradiation. The antibacterial properties of NO, GNO, and rNO NPs are differentiated by their size and ability to generate reactive oxygen species. Due to decreased crystallite size more ROS are generated for rNO and hence enhanced antibacterial potency has been realized.