Abstract
Dye wastewater possess immense toxicity with carcinogenic properties and they persist in environment owing to their stability and resistance to chemical and photochemical changes. The bio degradability of dye-contaminated wastewater is low due to its complex molecular structure. Nano-photocatalysts based on zinc oxide are reported as one of the effective metal oxides for dye remediation due to their photostability, enhanced UV and visible absorption capabilities in an affordable manner. An electron–hole pair forms when electrons in the valence band of ZnO nano-photocatalyst transfer into the conduction band by absorbing UV light. The review article presents a detailed review on ZnO applications for treating acidic and basic dyes along with the dye degradation performance based on operating conditions and photocatalytic kinetic models. Several acidic and basic dyes have been shown to degrade efficiently using ZnO and its nanocomposites. Higher removal percentages for crystal violet was reported at pH 12 by ZnO/Graphene oxide catalyst under 400 nm UV light, whereas acidic dye Rhodamine B at a pH of 5.8 was degraded to 100% by pristine ZnO. The mechanism of action of ZnO nanocatalysts in degrading the dye contamination are reported and the research gaps to make these agents in environmental remediation on real time operations are discussed.
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References
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KRSEL, REM, and SB ( research assistants) took part in writing, data preparation and processing. NR (professor) took part in supervision, conceptual design formation, validation, writing and editing. MR (professor) took part in supervision, writing and editing.
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Saif Al Essai, K.R., Moheyelden, R.E., Bosu, S. et al. Enhanced mitigation of acidic and basic dyes by ZnO based nano-photocatalysis: current applications and future perspectives. Environ Geochem Health 46, 139 (2024). https://doi.org/10.1007/s10653-024-01935-2
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DOI: https://doi.org/10.1007/s10653-024-01935-2