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Achieving highly promoted visible-light sensitive photocatalytic activity on BiOIO3 via facile iodine doping A Physicochemical and engineering aspects

Huang, Hongwei, Ou, Hongling, Feng, Jingwen, Du, Xin, Zhang, Yihe
Colloids and surfaces 2017 v.518 pp. 158-165
azo dyes, hydroxyl radicals, iodine, lighting, methyl orange, photocatalysis, photocatalysts, photolysis, superoxide anion
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 (λ>420nm). 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 down-shift of the conduction band than valence band. Additionally, two powerful radicals superoxide radicals (O2⁻) and hydroxyl radicals (OH) are produced in the photodegradation process, which are responsible for the high visible-light photocatalytic activity.