Insights into the mechanism of g-C3N4@a-Fe2O3 microsphere heterogeneous activation of hydrogen peroxide under visible light

Authors

  • Jingwei Chen

DOI:

https://doi.org/10.56028/aetr.2.1.443

Keywords:

g-C3N4@a-Fe2O3; Fenton photocatalytic process; persulfates; non-free radical reaction

Abstract

A-Fe2O3 complex g-C3N4@a-Fe2O3 was successfully prepared by solvothermal method and used in optical Fenton photocatalytic process. Using experimental instruments such as XPS, XRD, DRS, TEM, FTIR, and photochemistry to characterize composite materials. According to the mechanism of the photocatalytic process, combining A-Fe2O3/H2O2 Fenton reagent with g-C3N4 photocatalyst under visible light conditions can effectively accelerate the mineralization of pollutants. The photocatalytic performance of g-C3N4@a-Fe2O3 were evaluated by the decomposition of bisphenol A. When the content of a-Fe2O3 is 15%, the photocatalytic efficiency of the composite is the highest. In addition, cyclic operation, iron leaching concentration, fresh and XRD pattern studies indicate that g-C3N4@a-Fe2O3 composites are very stable and reusable. The results show that the decomposition of BPA by persulfate is a non-free radical reaction, but the coupling a-Fe2O3 with g-C3N4 can effectively activate the formation of persulfate free radicals and reduce BPA under visible light radiation. Studies showed that free radicals generated by electron holes and persulfate formed on catalysts were the main causes of BPA decomposition. Therefore, combined with previous research results, this paper proposed the mechanism of g-C3N4@a-Fe2O3 composite photocatalytic reaction by photo-Fenton. More importantly, this work demonstrates a novel approach to activate persulfates that can efficiently degrade pops and gives some new ideas on the remediation of persulfates in contaminated Water.

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Published

2022-09-24