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Preparation of graphene-based catalysts and combined DBD reactor for VOC degradation

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Abstract

The objective of this study was to compare the transformation of by-products between single dielectric barrier discharge (SDBD) and double dielectric barrier discharge (DDBD), to optimize the preparation of graphene-based catalysts and apply them in combination with DBD for volatile organic compound degradation. We compared the degradation performance of SDBD and DDBD, prepared, and characterized graphene-based catalysts. SEM, BET, XRD, and FTIR analyses showed that the morphologies and internal structures of the three catalysts were the best when 0.25 mL of [BMIM]PF6 was added. When MnOx/rGO, FeOx/rGO, and TiOx/rGO were used in combination with DDBD, the degradation rates of benzene were found to be 83.5%, 77.2%, and 63.8%, respectively, whereas the O3 transformation rates were 60%, 79%, and 40%, respectively. Moreover, the NO2 transformation rates were 70%, 55%, and 42.5%, respectively, whereas the NO transformation rates were 69%, 39%, and 33.5%, respectively. The CO2 selectivity was 62%, 51%, and 49%, respectively. MnOx/rGO exhibited superior performance in the degradation of benzene series, NO transformation, NO2 transformation, CO2 selectivity, and energy efficiency. On the other hand, FeOx/rGO exhibited superior performance for O3 transformation. Based upon the XPS analysis, it was found that Mn3O4 and Fe3O4 played a leading role in promoting the degradation of benzene series and the transformation of by-products.

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Funding

Financial supports for this project were provided by the National Natural Science Foundation of China (No. 21676032), the Key Research and Development Project Foundation of Science and Technology Department of Sichuan Province (No. 2020YFS0342), the Education Department of Sichuan Province (No.14TD0020), the Chengdu Science and Technology Bureau (No. 2016-GH02-00032-HZ), which are greatly acknowledged.

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ZL did research experiments and analyzed the data; YW, GZ, and JY did the other experiments; ZL, along with SL, led the writing of the manuscript.

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Correspondence to Shengyu Liu.

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Liu, Z., Wang, Y., Zhang, G. et al. Preparation of graphene-based catalysts and combined DBD reactor for VOC degradation. Environ Sci Pollut Res 29, 51717–51731 (2022). https://doi.org/10.1007/s11356-022-19483-6

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  • DOI: https://doi.org/10.1007/s11356-022-19483-6

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