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Experimental and computational assessment of 1,4-Dioxane degradation in a photo-Fenton reactive ceramic membrane filtration process

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Abstract

The present study evaluated a photo-Fenton reactive membrane that achieved enhanced 1,4-Dioxane removal performance. As a common organic solvent and stabilizer, 1,4-Dioxane is widely used in a variety of industrial products and poses negative environmental and health impacts. The membrane was prepared by covalently coating photocatalyst of goethite (α-FeOOH) on a ceramic porous membrane as we reported previously. The effects of UV irradiation, H2O2 and catalyst on the removal efficiency of 1,4-Dioxane in batch reactors were first evaluated for optimized reaction conditions, followed by a systematical investigation of 1,4-Dioxane removal in the photo-Fenton membrane filtration mode. Under optimized conditions, the 1,4-Dioxane removal rate reached up to 16% with combination of 2 mmol/L H2O2 and UV365 irradiation (2000 µW/cm2) when the feed water was filtered by the photo-Fenton reactive membrane at a hydraulic retention time of 6 min. The removal efficiency and apparent quantum yield (AQY) were both enhanced in the filtration compared to the batch mode of the same photo-Fenton reaction. Moreover, the proposed degradation pathways were analyzed by density functional theory (DFT) calculations, which provided a new insight into the degradation mechanisms of 1,4-Dioxane in photo-Fenton reactions on the functionalized ceramic membrane.

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Acknowledgements

The authors gratefully acknowledge funding support from the National Natural Science Foundation of China (Grant Nos. 51778306, 21906001 and 51721006).

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Correspondence to Changqing Liu or Wen Zhang.

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Highlights

• 1,4-Dioxane was degraded via the photo-Fenton reactive membrane filtration.

• Degradation efficiency and AQY were both enhanced in photocatalytic membrane.

• There was a tradeoff between photocatalytic degradation and membrane permeation flux.

• Degradation pathways of 1,4-Dioxane was revealed by DFT analysis.

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Xue, S., Sun, S., Qing, W. et al. Experimental and computational assessment of 1,4-Dioxane degradation in a photo-Fenton reactive ceramic membrane filtration process. Front. Environ. Sci. Eng. 15, 95 (2021). https://doi.org/10.1007/s11783-020-1341-y

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