Construction of type II ZnBiO/g-CN heterojunction photocatalysts for efficient degradation of acid red B

• Published in: New journal of chemistry 2023-12, Vol.47 (47), p.21944-21959
• Main Authors: Luo, Xuanlan, Yuan, Jinhai, Liu, Junhong, Hu, Haikun, Yang, Ziyi, Hou, Xiaopeng, Sun, Qi, Xu, Di
• Format: Article
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d3nj03678b

Ultrasonic assisted hydrothermal and calcination methods were used to prepare type II heterojunction ZnBi 2 O 4 /g-C 3 N 4 (ZBN) photocatalysts. The crystal structures, elemental compositions, morphologies and optical properties of the prepared monomer and heterojunction photocatalysts were characterized. The photocatalytic degradation efficiency of acid red B reached 95% in 180 min under UV irradiation, which was 1.82 and 1.44 times higher than that of g-C 3 N 4 and ZnBi 2 O 4 , respectively, and the reaction rate constants were increased from 0.004 min −1 and 0.005 min −1 to 0.015 min −1 . ZBN exhibited high photocatalytic activity, and the enhancement of activity can be attributed to the construction of the type II heterostructure and reduced carrier recombination. The degradation experiments of carmine, AO7, MO, MB and RhB showed that the composite ZBN had a better degradation effect on different dyes. The results of radical trapping experiments and EPR tests showed that &z.rad;O 2 − plays a crucial role in the photocatalytic degradation of acid red B. Finally, the mechanism of the photocatalytic degradation of acid red B by ZBN was investigated by combining EPR, VB-XPS and radical trapping experiments. Ultrasonic assisted hydrothermal and calcination methods were used to prepare type II heterojunction ZnBi 2 O 4 /g-C 3 N 4 (ZBN) photocatalysts.