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Degradation of hydroxypropyl guar gum by dual oxidant system catalyzed by hydrotalcite supported zero-valent transition metal

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Abstract

In order to address the issues of slow degradation rate, narrow pH applicability, and poor regeneration of zero-valent transition metal catalysts during the degradation of hydroxypropyl guar gum (HPG), templated hydrotalcite with hierarchical pores was established and hydrogen peroxide-persulfate dual oxidant was used in this work. The results demonstrate that zero-valent copper, supported on multilevel porous hydrotalcites synthesized using worm-like micellar soft templates within a wide pH range from 3 to 11, achieved a viscosity reduction rate of up to 80.92% for HPG within 25 min and a COD removal efficiency of 96.37% after 120 min. And high degradation efficiency, 81.08%, can be obtained even after five recycles at pH 7. Furthermore, free radical quenching experiments, as well as XRD, BET, and SEM characterization, confirm that the degradation of HPG is attributed to the collaborative activation of SO4·, ·O2, 1O2, and ·OH radicals in the H2O2–Na2S2O8 dual oxidant, which provide new insights for the degradation of oilfield pollutants.

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Acknowledgements

This work was financially supported by grants from Youth Innovation Team of Shaanxi University, Shaanxi Key Research and Development Plan (2023-YBGY-052), Key Scientific Research Program of Shaanxi Provincial Department of Education (23JP113) and Postgraduate Innovation Fund Project of **'an Shiyou University (YCS20211033).

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Correspondence to Y. Tang.

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Editorial responsibility: L. Yin.

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Bai, B., Liu, Q., Li, T. et al. Degradation of hydroxypropyl guar gum by dual oxidant system catalyzed by hydrotalcite supported zero-valent transition metal. Int. J. Environ. Sci. Technol. 21, 7467–7478 (2024). https://doi.org/10.1007/s13762-024-05479-x

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  • DOI: https://doi.org/10.1007/s13762-024-05479-x

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