A Comparison Study between ZnO Nanorods and WO_3/ZnO Nanorods in Bromocresol Green Dye Removal

摘要

This work studied the photocatalytic performance of ZnO nanorods and WO_3/ZnO nanorods in bromocresol green (BCG). The ZnO nanorods were pre-synthesized via solution precipitation method. Subsequently, the nanorods were kept in sodium tungstate solution for the deposition of WO_3. The present of WO_3 was confirmed by XRD and EDX analysis. ZnO nanorods (64.34%) showed a higher photodegradation efficiency of BCG removal than WO_3/ZnO nanorods (60.03%) under 75 minutes of UV irradiation. This could be attributed to the formation of WO_3/ZnO shell-core nanostructure which limited the generation of holes and hydroxyl free radicals that needed for the photodegradation of BCG dyes.