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Enhanced catalytic oxidation of reactive dyes by reuse of adsorption residuals as a heterogeneous catalyst with persulfate/UV process

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Abstract

In this study, residuals from iron adsorption onto activated carbon prepared from corn cobs (R/Fe-CAC) were reused as a heterogeneous catalyst for degradation of reactive blue 222 dye (RB222) with persulfate and UV process. Operational parameters as catalyst dose, pH, persulfate (PS) dose, and initial RB222 concentration were investigated. The R/Fe-CAC catalyst was characterized by SEM, TEM, EDX, FTIR, XRD, N2 adsorption-desorption, and Raman spectroscopy techniques. The results revealed that R/Fe-CAC with UV was able to activate PS to completely degrade RB222 within 10 min only at pH 3. A catalyst dose of 0.025 g/L is sufficient to obtain 100% removal efficiency of RB222 with PS/UV process. The degradation rate constants of RB222 were 0.0625 and 0.1162 min−1 for dye concentrations of 100 and 50 mg/L, respectively. Quenching experiments showed that sulfate radicals, hydroxyl radicals, superoxide radicals, and holes were responsible species for oxidation of RB222 dye. The extended operation of the R/Fe-CAC for five consecutive cycles confirmed the stability of photocatalytic activity and the potential of efficient reuse.

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Acknowledgments

The authors gratefully acknowledge the support from the members of Sanitary Engineering Lab (SEL), Faculty of Engineering, Mansoura University.

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All authors contributed to the study’s conception and design. NE contributed to the material preparation and data collection. HM performed the analysis of data and was a major contributor in writing the manuscript. All authors read and approved the final manuscript.

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Correspondence to H. Mahanna.

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The authors declare that they have no competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Editorial responsibility: Shahid Hussain.

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Mahanna, H., El-Bendary, N. Enhanced catalytic oxidation of reactive dyes by reuse of adsorption residuals as a heterogeneous catalyst with persulfate/UV process. Int. J. Environ. Sci. Technol. 19, 10945–10956 (2022). https://doi.org/10.1007/s13762-021-03856-4

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  • DOI: https://doi.org/10.1007/s13762-021-03856-4

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