Abstract
In the present study, the decolourization efficiency of Reactive Red 183 using the solar catalytic ozonation process has been studied using γ-alumina for the first time. To explicate the mechanism of catalytic ozonation, experiments were performed with different combinations like O3, O3/UV, O3/Al2O3, Al2O3, and O3/UV/Al2O3. Moreover, the effect of pH, hydroxyl radical scavenger, and phosphates on Reactive Red 183 removal, were also investigated. The synergic process (O3/UV/Al2O3) was found to be the best as compared with other processes at all studied pH values. The decolourization efficiencies were found to follow order as: O3/UV/Al2O3 > O3/UV > O3/Al2O3 > O3 > Al2O3. The results indicated that the adsorption of dye played a significant role in overall removal efficiency in the synergic process. The synergic process involved radical mechanism and surface hydroxyl groups of alumina were important active sites. Furthermore, solar radiation could impart a key role in the decomposition of formed hydrogen peroxide to accelerate the overall decolourization efficiency of the synergic process. In the end, it was deduced that the synergic process was highly efficient for the decolourization of dyes from wastewater.
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Ikhlaq, A., Javed, F., Sohail, R. et al. Solar Photo-Catalytic ozonation on γ-alumina for the removal of dyes in wastewater. Int. J. Environ. Sci. Technol. 18, 1967–1974 (2021). https://doi.org/10.1007/s13762-020-02940-5
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DOI: https://doi.org/10.1007/s13762-020-02940-5