Citation: LI Hui-Quan, CUI Yu-Min, WU Xing-Cai, HUA Lin, HONG Wen-Shan. Structure and Properties of BiOI/TiO₂ (A) Photocatalysts with Different Bi/Ti Molar Ratios[J]. Acta Physico-Chimica Sinica, ;2012, 28(08): 1985-1991. doi: 10.3866/PKU.WHXB201205161 shu

Structure and Properties of BiOI/TiO₂ (A) Photocatalysts with Different Bi/Ti Molar Ratios

LI Hui-Quan ^1,2 ,
CUI Yu-Min ^1,2, ,
WU Xing-Cai ^3, ,
HUA Lin ⁴ ,
HONG Wen-Shan ¹

1.
1. School of Chemistry and Chemical Engineering, Fuyang Normal College, Fuyang, 236041, Anhui Province, P. R. China;
2. Anhui Provincical Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang 236041, P. R. China;
3. The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. China;
4. R&D center, Singapore Linovus Technology Pte Ltd, 059818, Singapore

Received Date: 19 March 2012
Available Online: 16 May 2012
Fund Project: 国家自然科学基金(21171091) (21171091)安徽省高校省级自然科学基金(KJ2012A217, KJ2012B136)资助项目 (KJ2012A217, KJ2012B136)

BiOI-sensitized nano-anatase (TiO₂ (A)) photocatalysts were prepared by a deposition method at room temperature, and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL), and UV-Vis diffuse reflectance spectra (UV-Vis DRS). The photocatalytic activities were evaluated by photo-degradation experiments of rhodamine B. With increasing BiOI content, the absorption intensity of BiOI/TiO₂ (A) increases in the 370-630 nm region and the absorption band edge redshifts. The UV and visible light photocatalytic activities increase, reaching a maximum when the Bi/Ti molar ratio is 1.7% . The 1.7% BiOI/TiO₂ (A) catalyst exhibits much higher visible-light photoactivity than P25, and its UV-light photoactivity is slightly higher than that of P25. The UV and visible light photocatalytic activities of BiOI/TiO₂ (A) with similar BiOI content are lower than those of BiOI/P25 catalysts. Compared with TiO₂ (A), 1.7% BiOI/TiO₂ (A) shows higher UV and visible light photoactivities. This is attributed to the strong absorption in the 370-630 nm region, the redshift of the absorption band edge, and the effective transfer of the photogenerated electrons and holes, which reduces the recombination of electron-hole pairs.
- Deposition method,
- Sensitized,
- Anatase,
- BiOI content,
- Photocatalysis
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Structure and Properties of BiOI/TiO2 (A) Photocatalysts with Different Bi/Ti Molar Ratios

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Structure and Properties of BiOI/TiO₂ (A) Photocatalysts with Different Bi/Ti Molar Ratios