Influence of BiOIO3 morphology on the photocatalytic efficiency of Z-scheme BiOIO3/g-C3N4 heterojunctioned composite for Hg0 removal

• Published in: Journal of colloid and interface science 2020-01, Vol.558, p.123-136
• Main Authors: Zhang, Xia, Wang, Daolei, Man, Xiaokun, Wu, Jiang, Liu, Qizhen, Qi, Yongfeng, Liu, Zhiqiang, Zhao, Xiaoyan, Wu, Jiaxi, Hao, Chenyu
• Format: Article
• Language: English
• Subjects: BiOIO3/g-C3N4; Electron-hole pairs; Heterojunction; Morphology; Photocatalysis
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2019.09.077

[Display omitted] •The as-prepared BiOIO3/g-C3N4 heterojunction can improve the photocatalytic efficiency of the catalyst.•The crystal plane growth of BiOIO3 can be tuned by changing the solution environment.•The morphology of BiOIO3 can influence the photocatalytic activity of BiOIO3/g-C3N4 composite.•Reasonable charge transfer and photocatalytic reaction mechanisms are proposed. The morphology of catalyst is a very important factor influencing the photocatalytic activity of the catalyst. Owing to its scientific and technological importance, controllable preparation of photocatalysts with different morphologies has been studied. In this work, BiOIO3/g-C3N4 heterojunction composites are synthesized using hydrothermal method and the composites with different morphologies are fabricated by adjusting the amount of NaOH in precursor solutions to control the growth of BiOIO3 crystal plane. The physicochemical properties of BiOIO3/g-C3N4 heterojunction composites were investigated by XRD, XPS, FTIR, SEM, TEM, HRTEM, BET, UV–vis DRS and PL characterization. The effect of the BiOIO3 morphology on the photocatalytic efficiency of BiOIO3/g-C3N4 heterojunction composites was evaluated by photocatalytic removal of gas-phase Hg0 under visible light irradiation. When the morphology of BiOIO3 is regular square-like, BiOIO3/g-C3N4 has the optimal removal efficiency 92.6% of Hg0. Finally, electron-hole migration path and photocatalytic mechanism of catalysts are proposed.