Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 38, Pages 57330-57344Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-19796-6
Keywords
Photocatalysis; Green synthesis; Ag-doped ZnO; Sunlight; Reusability; Mechanism
Categories
Funding
- UGC-DAE Consortium for Scientific Research Indore Center [CSR IC -236/2017-18/1317, CSR IC-MSRSR-09/CRS-217/2017-18/1298]
- CAPES (Coordination for the Improvement of Higher Education Personnel)
- CNPq (National Council for Scientific and Technological Development)
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In this study, Ag-doped ZnO nanoparticles were synthesized using a toxic agent-free and environmentally friendly method for photocatalytic removal of methylene blue in water under sunlight irradiation. The catalyst exhibited superior catalytic activity compared to pure ZnO, resulting in high removal efficiency for methylene blue. The material also showed satisfactory reusability and a suggested reaction mechanism for methylene blue photodegradation was proposed under sunlight irradiation.
In this work, Ag-doped ZnO nanoparticles (NPs) were synthesized by a simple green method using a toxic agent-free route for photocatalytic purposes, toward methylene blue (MB) removal in water under sunlight irradiation. The effects of operating parameters, such as catalyst dosage, dye concentration, and pH, on the MB removal efficiency, were investigated. The presence of Ag on the ZnO structure resulted in superior catalytic activity compared to the pure ZnO sample. High removal efficiency for MB, corresponding to 95%, was obtained in 30 min of reaction time only, using Ag-doped ZnO NPs. This result can be related to its smaller bandgap energy (1.92 eV) when compared to the ZnO sample (2.85 eV). The material presented a satisfactory level of reusability after three consecutive cycles. In addition, a reaction mechanism for MB photodegradation onto Ag-doped ZnO NPs under sunlight irradiation was suggested. Overall, the catalyst prepared via the green route in this work exhibited excellent photocatalytic activity under sunlight for MB degradation in an aqueous solution.
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