Achieving highly promoted visible-light sensitive photocatalytic activity on BiOIO3 via facile iodine doping

作者：Huang, Hongwei^*; Ou, Hongling; Feng, Jingwen; Du, Xin; Zhang, Yihe^*

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2017, 518: 158-165.

DOI：10.1016/j.colsurfa.2017.01.045

• BiOIO3
• Iodine ion doping
• Photocatalysis
• Visible-light
• Dye

Visible-light active photocatalytic performance of a layered bismuth-based photocatalyst BiOIO3 was achieved by iodine ion doping through a facile hydrothermal process. Compared to pure BiOIO3, the light responsive range of BiOIO3 is drastically extended from UV to visible light, and the adjustable band gap is also achieved. The photocatalytic experiments revealed that I-doped BiOIO3 displays significantly enhanced photocatalytic activity (over 6-fold increase) toward degradation of two types of azo dyes methyl orange (MO) and Rhodamine B (RhB) with visible light illumination (lambda > 420 nm). The photoelectrochemical measurement also confirms the greatly promoted photo-activity of modified BiOIO3. The band structure evolution and visible-light induced photocatalytic mechanism are investigated in detail. It is demonstrated that the visible-light response of I-doped BiOIO3 mainly originates from a larger downshift of the conduction band than valence band. Additionally, two powerful radicals superoxide radicals (O-center dot(2)-) and hydroxyl radicals ((OH)-O-center dot) are produced in the photodegradation process, which are responsible for the high visible-light photocatalytic activity.

• 出版日期2017-4-5
• 单位北京科技大学; 中国地质大学（北京）