Abstract
In this study, different BiOI/B4C binary composites were evaluated as novel heterojunctions for the first time in the photocatalytic oxidative desulfurization process, and good results were obtained under visible light for the removal of dibenzothiophene sulfur compound with air oxidizer. The composites with different mass ratios were synthesized by hydrothermal method. In addition, different analysis including XRD, FT-IR, FE-SEM, EDX-MAP, TEM, BET, UV–vis DRS, PL, EIS and Mott-Schottky were used to identify the structure, morphology and performance of the composites. Hydroxyl and superoxide active species performed the three steps of electron-hole processing in the best way while improving the oxidation process with Z-scheme heterojunction. Experiment design process was carried out with Design Expert software and optimizing the parameters was performed in order to find the best operating conditions. The results showed that the optimal composite achieved the highest degradation performance of dibenzothiophene with a value of 95.1% in 30 min. In order to determine the degradation mechanism, trapping test was performed, and it was found that •O2– and •OH– radicals played a significant role in the photocatalytic process. In addition, due to the proper recovery of the BiOI/B4C heterojunction, this binary composite was proposed for industrial use.
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