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Photocatalytic degradation of methylene blue, rhodamine B, methyl orange and Eriochrome black T dyes by modified ZnO nanocatalysts: A concise review

2022; Elsevier BV; Volume: 143; Linguagem: Inglês

10.1016/j.inoche.2022.109764

1879-0259

Ravindra H. Waghchaure, Vishnu A. Adole, Bapu S. Jagdale,

TiO2 Photocatalysis and Solar Cells

One of the issues receiving global attention is the prevalence of dyes in wastewater and water resources. These chemicals' persistence, toxicity, and carcinogenic potential have a significant influence on aquatics and humans, making their removal prior to discharge into the environment necessary. Semiconducting metal oxide and modified metal oxide-mediated photocatalysis has emerged as a superior wastewater treatment process to tackle the major challenges faced by traditional technologies. The multifunctional ZnO nanomaterial due to its inexpensive nature, eco-friendly, structure-dependent properties, and complete mineralization of pollutants make them more efficient semiconducting photocatalysts than other materials. It has been seen that ZnO nanomaterials can show high performance in photo-induced degradation of cationic and anionic dyes and for the treatment of industrial effluent due to its high efficiency under ultraviolet light, with a 3.37 eV the bandgap. Taking account of all these crucial aspects, this paper presents a review of recent achievements in the degradation of methylene blue, and rhodamine B as a cationic dye, and methyl orange andEriochrome black T as an anionic dye, by studying the operating parameters like reaction time, pH, initial dye concentration, and catalyst concentration, etc.