Effect of Nickel Loading on Phase Formation and Photocatalytic Activity of WO_۳-Based Materials

The effect of nickel content on phase formation, structure, and photocatalytic activity of   (WO۳)-based materials prepared by wet impregnation with nominal nickel contents of ۰.۴, ۰.۸, ۱.۶, and ۲.۴ wt% was investigated. The synthesized materials were characterized to determine their structural, textural, and optical properties. The incorporation of Ni into WO۳ led to the formation of the NiWO۴ phase at high metal contents (۱.۶ and ۲.۴%), and also produced changes in both surface area and band gap energy (Eg). Photocatalytic activity was evaluated for the degradation of ۲,۴-dichlorophenoxyacetic acid (۲,۴-D)  under UV irradiation. It was observed that modifying WO۳ with ۰.۸% Ni promoted a ۹۶% degradation; however, activity decreased in samples with higher metal concentrations. These results indicate that a moderate amount of Ni enhances the photocatalytic performance, while an excess promotes the formation of aggregates, which may hinder charge separation and reduce overall photoactivity

کلیدواژه ها:

WO۳ ، NiWO۴ ، Photodegradation ، ۲ ، ۴-Dichlorophenoxyacetic acid