Fabrication of a novel Ni-doped CdAl2O4 nanoparticles and applications in photo-oxidation processes under visible light illumination

• Published in: Molecular catalysis 2023-01, Vol.535, p.112835, Article 112835
• Main Authors: Rajesh, G., Senthil Kumar, P., Rangasamy, Gayathri, Akilandeswari, S., Mandal, Aindrila, Shankar, V. Uma, Ramya, M., Nirmala, K., Thirumalai, K.
• Format: Article
• Language: English
• Subjects: ESR; Ni-doped CdAl2O4; Photodegradation; Photoluminescence; Scavenger species
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2022.112835

•A novel Ni-doped CdAl2O4 nanocatalyst was prepared by a co-precipitation approach.•Spherical and rod-like morphology of optimized catalyst is found in the TEM study.•The .OH− and h+ radicals played a leading role in the photodegradation process.•Greater photodegradation performance of doped catalyst against BB and BG dyes than pure.•The ni (0.075 M) doped catalyst showed excellent stability and can recycle for sixth runs. The existence of azo dyes (BB and BG) in textile wastewater is a major problem owing to their possible effect on human health and the environment. In this work, we examine the photodegradation performance under the visible sources of BB and BG are Azo dyes extensively applied in the food and textile industries. An initial screening of dissimilar Ni-doped CdAl2O4 nanoparticles was determined to classify the most outstanding candidate for BB and BG removal. The Ni (0.075 M) doped CdAl2O4 nanoparticles after 90 min illuminations, 95 and 96% of BB and BG removal were noticed in pH =5 (acidic) and 5 mg catalyst dosage conditions. The recyclability of the Ni (0.075 M) doped CdAl2O4 catalyst was tested under optimized circumstances. The outcomes demonstrate that Ni (0.075 M) doped CdAl2O4 products exhibit substantially high stability with above 85 and 90% removal after the sixth catalytic run. The scavenging (free radicals) experiments revealed that .OH− and h+ radicals play a central role in BB and BG degradation. Overall, the outcomes obtained propose that the suggested route may denote an appropriate technique for the elimination of BB and BG from textile wastes. This work shows the new pathway to improve more efficient materials for the elimination of industrial effluents. [Display omitted]