Enhancement of double heterojunction Bi12SiO20-Bi2O2SiO3-BiOXmYn with high Adsorption-Visible catalytic Performance: Synergistic effect of morphology regulation and controllable energy band

The search for a photocatalyst toward degradation of different organic dyes and antibiotic remains a challenging task due to the difficult of controllable micro-morphology and double heterojunction in the same photocatalytic system. Herein, a ion exchange technology was used to obtain double heterojunction Bi12SiO20/Bi2O2SiO3/BiOX (BOSX, X is an element of Cl, Br, I). Moreover, three series of two-dimensional materials Bi12SiO20/Bi2O2SiO3/BiOXmYn (BSOXYK, X, Y is an element of Cl, Br, I, m + n = 1, K = m/n) containing solid solution were realized, which have excellent adsorption catalytic synergistic effect on rhodamine B, methyl orange and tetracycline hydrochloride. This synergistic effect of adsorption and catalysis is due to the change of material morphology, double heterojunction interaction and continuous band regulation. After regulation, this series of photocatalysts show good degradation effects on a variety of pollutants, namely, the degradation rate on 30 mg.L-1 Rh B, 50 mg.L-1 TCH and 10 mg.L-1 MO can up to 99 % (BSOCI4), 85% (BSOCI4) and 99% (BSOCI1) respectively, which makes this series of materials have a wide range of applications. Therefore, this work provides a new insight in exploring double heterojunction catalysts with solid solution to realize the degradation of different organic pollutions in the same system under visible light. (C) 2021 Published by Elsevier B.V.

Automated summary

This study demonstrates the successful synthesis of a photocatalyst with double heterojunction structure using ion exchange technology, which shows excellent degradation performance towards different organic dyes and antibiotic. By altering the material morphology, double heterojunction interaction, and continuous band regulation, this series of photocatalysts exhibit high degradation efficiency on various pollutants under visible light.