Semiconductor-Assisted Photodegradation of Azo Dye (OII), Antioxidant and Bactericidal Effect of TiO2/NiO Nanocomposite

Abstract

Abstract Chemical reduction method was used to synthesize Nickle oxide nanoparticles (NiO NPs) and NiO supported on titanium dioxide (TiO2/NiO) NPs. The morphological investigation showed that neat TiO2 NPs are present in both a dispersed and agglomerated form, whereas NiO NPs are well distributed and deposited on the surface of TiO2 with size below 200 nm. The majority of the NiO NPs have a cubical form. The formation of NiO NPs was also verified by FT-IR analysis. The synthesized TiO2/NiO and NiO NPs were used as photocatalystsfor the degradation of Orange II (OII) dye. According to the degradation investigation, both NiO NPs and TiO2/NiO NPs degraded OII dye more efficiently when exposed to UV light. The results indicated that NiO NPs degraded 93% and TiO2/NiO NPs degraded approximately 96% of OII dye within 30 min. The recovered and re-recovered NPs were also significantly degraded OII dye. The effects of initial dye concentration, catalyst dosage, and pH effect were studied. Promising bioactivities were demonstrated by TiO2/NiO and NiO NPs against the pathogenic bacteria citrobacter and provedincia. TiO2/NiO NPs have strong antioxidant activity (80%) compared to the standard ascorbic acid (88%).