Preparation of chabazite based Fenton-like heterogeneous catalyst and its organic micropollutant removal performance

Date

2023-04-01

Author

Ali, Mohsin
Dilek, Filiz Bengü
İpek Torun, Bahar

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Natural chabazite (CHA) is used for the first time as a heterogeneous catalyst in Fenton-like oxi- dation. Pretreatment techniques (NH4+-exchange, steam treatment, and Fe-exchange) were ap- plied to natural CHA to improve the available micropore and mesopore volume as well as to in- crease Fe-content. CHA samples were characterized by XRD, N2 adsorption, UV–Vis, SEM-EDX, ICP-OES, and MAS NMR to study the improvement after each pretreatment. Steam treatment at 675 °C and 20 kPa improved the mesopore volume of CHA, which enabled Fe3+ concentration to increase from 0.24 to 0.60 mmol Fe3+ g CHA−1 following the Fe-exchange. The Fe-exchanged CHA (Fe-CHA) was then tested for malathion oxidation. The effect of H2O2 and catalyst doses and pH on the degradation of malathion was investigated. Fenton-like oxidation was realized at a higher and wider pH range (pH 3–7) when compared to classical Fenton. A malathion removal between 20 and 81% was achieved depending on the initial malathion concentration (250–750 μg L−1), Fenton Reagents (H2O2 and Fe-CHA) concentrations (75–300 mg L−1 and 250–750 mg L−1, respectively) and pH (3–7). The metabolites of malathion were identified as malaoxon, desmethyl malaoxon and diethyl malate. A possible oxidation pathway was proposed, where desmethyl malaoxon and diethyl malate were identified as the secondary oxidation prod- ucts. Moreover, the performance of Fe-CHA was compared with commercially available synthetic zeolites of Fe-Ultra-stable Y and Fe-ZSM-5. Fe-CHA is found to be comparably effective as these synthetic zeolites, as well as providing substantially smaller sludge production when compared to classical Fenton.

URI

https://hdl.handle.net/11511/101605

Journal

Sustainable Chemistry and Pharmacy

DOI

https://doi.org/10.1016/j.scp.2022.100928

Collections

Department of Environmental Engineering, Article

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Citation Formats

M. Ali, F. B. Dilek, and B. İpek Torun, “Preparation of chabazite based Fenton-like heterogeneous catalyst and its organic micropollutant removal performance,” Sustainable Chemistry and Pharmacy, vol. 31, pp. 100928–100928, 2023, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/101605.