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Preparation, Characterization and Visible-light-responsive Photocatalytic Activity of Cerium-doped Bismuth Oxide
- Chinese Journal of Luminescence Vol. 35, Issue 8, Pages: 956-963(2014)
- 作者机构：
1. 吉林大学 地下水资源与环境教育部重点实验室,吉林 长春,130021
2. 广东寰球广业工程有限公司,广东 广州,510000
- 作者简介：
- 基金信息：
DOI：10.3788/fgxb20143508.0956
CLC： O643.36Received：18 May 2014，
Revised：23 June 2014，
Published：03 August 2014
- 稿件说明：
移动端阅览
肖国生, 刘佳露, 刘卓婧等. Ce掺杂Bi<sub>2</sub>O<sub>3</sub> 光催化剂的制备、表征及其可见光催化性能[J]. 发光学报, 2014,35(8): 956-963
XIAO Guo-sheng, LIU Jia-lu, LIU Zhuo-jing etc. Preparation, Characterization and Visible-light-responsive Photocatalytic Activity of Cerium-doped Bismuth Oxide[J]. Chinese Journal of Luminescence, 2014,35(8): 956-963
肖国生, 刘佳露, 刘卓婧等. Ce掺杂Bi<sub>2</sub>O<sub>3</sub> 光催化剂的制备、表征及其可见光催化性能[J]. 发光学报, 2014,35(8): 956-963 DOI： 10.3788/fgxb20143508.0956.
XIAO Guo-sheng, LIU Jia-lu, LIU Zhuo-jing etc. Preparation, Characterization and Visible-light-responsive Photocatalytic Activity of Cerium-doped Bismuth Oxide[J]. Chinese Journal of Luminescence, 2014,35(8): 956-963 DOI： 10.3788/fgxb20143508.0956.
摘要
采用水热-焙烧法制备了Ce掺杂的可见光响应的Bi
2
O
3
光催化剂（Ce-Bi
2
O
3
）。利用 XRD、FT-IR、XPS和 UV-Vis对不同Ce-Bi
2
O
3
样品进行了表征分析，并以光催化降解金橙Ⅱ溶液为探针反应，考察了Ce-Bi
2
O
3
的可见光催化性能。结果表明，Ce掺杂可以减小催化剂的禁带宽度，使光谱响应范围向可见光拓展。掺杂的Ce可取代Bi
2
O
3
晶格中部分Bi，形成BiOCe键，并生成了少量铈铋复合氧化物（Bi
7.38
Ce
0.62
O
12.31
），它们的存在有效地抑制了光生电子-空穴对的复合，有助于提高Bi
2
O
3
的可见光催化活性。但焙烧时间过长将导致Ce-Bi
2
O
3
催化剂的表面发生烧结现象，致使其催化活性降低。可见光照射下的金橙Ⅱ光催化降解实验表明，经2 h焙烧后得到的Ce/Bi的量比为0.5 的Ce-Bi
2
O
3
催化剂具有最佳的光催化活性。
Abstract
Ce-doped Bi
2
O
3
photocatalysts with different molar ratio were prepared by the hydrothermal process
and then calcined at 600℃ for hours. The Ce-Bi
2
O
3
photocatalysts were characterized by X-ray diffraction (XRD)
Fourier transform infrared spectroscopy (FT-IR)
X-ray photoelectron spectroscopic(XPS)
and ultraviolet-visible spectrophotometry (UV-Vis)
respectively. The photocatalytic properties of Ce-Bi
2
O
3
were evaluated by the photo-degradation of acid orange Ⅱ under visible light irradiation. The results show that the doping of Ce can decrease the band gap of Bi
2
O
3
significantly
and extend the visible light absorption. The doped Ce partially substitutes Bi in the lattice of Bi
2
O
3
which exists in the form of BiOCe chemical bond. Meanwhile
a new complex metal oxide compound (Bi
7.38
Ce
0.62
O
12.31
) appears in the catalysts
which can separate the electron-hole pairs and improve the photocatalytic performance. The results also indicate that the catalyst can be sintered with the extension of calcination time
resulting in lower catalytic activity of Ce-doped Bi
2
O
3
. Generally
the Ce-doped Bi
2
O
3
samples with the Ce/Bi molar ratio of 1:2 calcined at 600℃ for 2 h possess the great photocatalytic activity for acid orange Ⅱ.
关键词
Keywords
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