BiOIO3/graphene interfacial heterojunction for enhancing gaseous heavy metal removal

• Published in: Materials research bulletin Vol. 122; p. 110620
• Main Authors: Ling, Yang, Wu, Jiang, Man, Xiaokun, Xu, Yiqing, Liu, Qizhen, Qi, Yongfeng, Wu, Qiang, Qi, Xuemei, Jia, Tao, Guo, Zihan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2020
• Subjects: BiOIO3; DFT; Graphene; Mercury; BiOIO3; DFT; Graphene; Mercury
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2019.110620

[Display omitted] •The BiOIO3/GR heterostructure was fabricated and evaluated for oxidation of Hg0.•The band gap of BiOIO3/GR is narrowed by the contribution of C 2p orbital in CB.•The photocatalytic oxidation mechanism of Hg0 by BiOIO3/graphene is proposed. Bismuth oxide iodate (BiOIO3) was used to remove elemental mercury (Hg0) in recent years, due to its suitable position of valence band. While its low response to visible light and high recombination rate of electron-hole pairs limit the industrial application. In this work, the BiOIO3/graphene heterostructures were prepared successfully via the hydrothermal method, and series of characterization analysis were implemented. The prepared BiOIO3/GR composite have enhanced photocatalytic properties than pure BiOIO3. The density functional theoretical (DFT) calculation of the interfacial heterojunction between BiOIO3 (010) facet and graphene sheet further verifies the internal mechanism of improving photocatalytic performance. This work will give some help for mercury pollution control in coal-fired power plant and other similar pollutant control areas.