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Enhancing H2O2 utilization efficiency for catalytic wet peroxide oxidation through the doping of La in the Fe-ZSM-5 Catalyst

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Abstract

Iron-loaded zeolite (Fe-zeolite) has shown great potential as an efficient catalyst for degrading organic pollutants with high concentrations in the catalytic wet peroxide oxidation (CWPO) process under mild conditions. Here, 0.4 wt% Lanthanum (La) was added in the 1.0 wt% Fe-ZSM-5 by two-step impregnation method for an enhanced H2O2 utilization efficiency. For a systematical comparison, the CWPO process at 55 °C, where m-cresol with a high concentration of 1000 mg/L as a substrate, was studied over Fe-ZSM-5 and Fe-La-ZSM-5 catalysts. Compared with Fe-ZSM-5, Fe-La-ZSM-5 showed 15% higher H2O2 utilization efficiency with comparable total organic carbon (TOC) removal at around 40%, meanwhile with a 15% reduced metal leaching. Transmission electron microscopy (TEM) with elemental mapping (EDS), surface acidity analysis by Fourier transform infrared (FT-IR) and NH3-temperature programmed desorption (NH3-TPD), redox property analysis by Raman spectroscopy and H2-temperature-programmed reduction (H2-TPR) of both catalysts revealed, that the La doped Fe-ZSM-5 can provide an altered surface acidity, a more uniform and evenly dispersed surface Fe species with a promoted reducibility, which effectively promoted the accurate decomposition of H2O2 into the reactive •OH radicals, enhanced the H2O2 utilization efficiency, and increased the catalyst stability. Also, more than 90% conversion was maintained during the continuous experiment for more than 10 consecutive test days under 55 °C without pH adjustment, showing a promising possibility of the Fe-La-ZSM-5 for a practical wastewater treatment process.

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Funding

This work was supported by the Joint fund of the Clean Energy Innovation Institute of the Chinese Academy of Sciences and Yulin University - Lantan wastewater resource utilization and industrial demonstration (Grant number [YLU-DNL Fund 2021003]), by the Ministry of Science and Technology of the People’s Republic of China - research and development of petrochemical wastewater treatment process based on physical method (Grant number [2019YFA0705803]).

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All authors contributed to the study conception and design. Weiling Piao: methodology, investigation, data curation, writing—original draft; Wenjing Sun: conceptualization, methodology; Danyang Yu: investigation; Wanying Zhang: investigation; Huangzhao Wei: project administration; Chenglin Sun: supervision, funding acquisition

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Correspondence to Chenglin Sun.

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Piao, W., Sun, W., Yu, D. et al. Enhancing H2O2 utilization efficiency for catalytic wet peroxide oxidation through the doping of La in the Fe-ZSM-5 Catalyst. Environ Sci Pollut Res 30, 108135–108149 (2023). https://doi.org/10.1007/s11356-023-29512-7

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  • DOI: https://doi.org/10.1007/s11356-023-29512-7

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