Abstract
Industrial units based on chemical processes—the textile and paper industries—are major sources of chlorophenols in the environment, and chlorophenolic compounds persist within the environment for a long time with high toxicity levels. The photo-assisted Fenton’s and photocatalysis processes were investigated for the degradation of chlorophenols in the present study. Response surface methodology was employed to get optimised conditions for photocatalysis and photo-Fenton process-governing factors, thus, yielding a profound removal efficiency. Under optimised conditions, with a photocatalyst dose of 0.2 g/L, oxidant concentration of 10.0 mM and pH 5.0, complete removal of 2,4-dichlorophenol (2,4-DCP) was observed in 210 minutes in photocatalytic treatment. In the case of the photo-Fenton process, at an H2O2 dose of 5.0 mM and Fe2+ concentration of 0.5 mM, the organic pollutant was eliminated within 5 minutes of reaction time under acidic conditions (pH 3.0). The RSM model reported the perfect fit of experimental data with the predicted response. Among different isotherm models, the Langmuir isotherm was the best fit. The process followed pseudo-first order rate kinetics among various kinetics models. For the obtained optimised conditions, sonication and solar energy-driven processes were incorporated to study enhanced mineralisation. The solar-assisted Fenton process reported maximum mineralisation (90%) and cost-effective ($0.01/litre for 100 mg/L 2,4-DCP) treatment among different hybrid oxidation processes. The work provides insight into harnessing the naturally available solar energy, reducing the overall treatment cost and opting for a sustainable treatment method.
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The authors are grateful to the Department of Environmental Engineering at DTU for providing the infrastructure and opportunity for carrying out the present study.
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Harsh Pipil: conceptualization, execution, data compilation and draft writing.
Shivani Yadav: conceptualization, execution, data compilation and draft writing.
Sunil Kumar: conceptualization, supervision, reviewing and editing
Anil Kumar Haritash: conceptualization, supervision, reviewing and editing.
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Pipil, H., Yadav, S., Kumar, S. et al. Synergistic potency of ultrasound and solar energy towards oxidation of 2,4-dichlorophenol: a chemometrics approach. Environ Sci Pollut Res 31, 8186–8209 (2024). https://doi.org/10.1007/s11356-023-31598-y
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DOI: https://doi.org/10.1007/s11356-023-31598-y