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Synthesis of Pd/(MnO2@PANI) Catalyst and Its Study on the Reduction of Cr(VI)

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Abstract

Liquid-phase catalytic hydrogenation is a non-polluting and highly efficient technique for the reductive removal of hexavalent chromium from water, which has the advantages of a simple device, easy operation, mild, and green reaction conditions without secondary pollution, and high efficiency. In this study, the loaded catalysts Pd/(MnO2@PANI) and Pd/MnO2 were synthesized by the precipitation deposition method, and the composition and morphology of the catalysts were analyzed by using ICP, XRD, XPS, and TEM characterization. The effects of different catalysts, catalyst dosage, initial Cr(VI) concentration, pH value, and palladium loading on the Cr(VI) reduction reaction were also investigated using Pd/(MnO2@PANI) and Pd/MnO2 as catalysts and formic acid as hydrogen source. The results showed that the reduction of 1 mM Cr(VI) was 99.4% after 120 min at pH 2 and 0.2 g/L catalyst. After 5 consecutive cycles, the reduction rate of Pd/(MnO2@PANI) remained at 41.5%, and the reduction efficiency of Pd/MnO2 was only 23.7% after five cycles, which indicated that Pd/(MnO2@PANI) with polyaniline as the coating layer is a more efficient and stable catalyst that can be recycled for the treatment of Cr(VI) in water. At the same time, after the coating of MnO2 with polyaniline, the original low toxicity and wide source of MnO2 will not affect the survival of other plants and animals and will not pollute the environment, and the use of Pd/(MnO2@PANI) for the reduction of Cr(VI) is of good practical significance, which provides a new solution for the treatment of chromium pollution.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding authors on reasonable request.

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Acknowledgements

The authors would like to thank Caixia Zhang from Shiyanjia Lab (www.shiyanjia.com) for the BET and FTIR analysis.

Funding

The financial support from the National Natural Science Foundation of China (42371185), and Anhui Normal University College Students’ Innovation and Entrepreneurship Training Program Project (2022056511) is gratefully acknowledged.

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Authors and Affiliations

  1. School of Ecology and Environment, Anhui Normal University, Wuhu, 241002, Anhui, China

    Dianzhao Li, Yuhong Cao, Dailiang Yu & Fan Wen

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  1. Dianzhao Li
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  2. Yuhong Cao
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  3. Dailiang Yu
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  4. Fan Wen
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YC was involved in conceptualizing and providing funding for the experimental data. DL conducted the experiments, mapped the data, and wrote the paper and assisted in manuscript revision. DY and FW reviewed relevant information and assisted in the experiments.

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Correspondence to Yuhong Cao.

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Li, D., Cao, Y., Yu, D. et al. Synthesis of Pd/(MnO2@PANI) Catalyst and Its Study on the Reduction of Cr(VI). Water Air Soil Pollut 235, 60 (2024). https://doi.org/10.1007/s11270-023-06871-y

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