Preparation and Characterization of p-n Heterojunction Photocatalyst Cu2O / In2O3 and its Photocatalytic Activity under Visible and UV Light Irradiation
Preparation and Characterization of p-n Heterojunction Photocatalyst Cu2O / In2O3 and its Photocatalytic Activity under Visible and UV Light Irradiation
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DOI：
10.1149/1.3489945
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发表时间：
2010-11
影响因子：
3.9
通讯作者：
Liu Wei;C. Shifu
中科院分区：
文献类型：
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作者：
Liu Wei;C. Shifu
以氢氧化铟为原料，在500℃焙烧3h制得In2O3光催化剂，以无水乙醇为分散剂，通过球磨将Cu2O掺杂到In2O3中，制得p-n异质结光催化剂Cu2O/In2O3.用X射线粉末衍射、紫外-可见漫反射光谱、X射线光电子能谱、对苯二甲酸光致发光探针法、光致发光发射光谱和透射电子显微镜对催化剂进行了表征。结果表明，Cu2O/In2 O3光催化还原Cr2 O2-7的活性远高于In2 O3光催化还原Cr2 O2-7的活性。但对亚甲基蓝的光催化氧化，其光催化活性远低于In_2O_3。也就是说，Cu2O/In2O3具有较高的光催化还原活性，但光催化氧化活性较低。对于Cr2O2-7的光催化还原，Cu2O的最佳掺杂量为0.5wt%。与纯In_2O_3相比，光催化剂的光吸收波长范围红移，提高了总光谱的利用率。考察了球磨时间对光催化活性的影响。并用p-n结原理和价带理论讨论了影响光催化活性的机理。
The photocatalyst In 2 O 3 was prepared from indium hydroxide calcined at 500°C for 3 h. The p-n heterojunction photocatalyst Cu 2 O/In 2 O 3 was prepared by ballmilling through doping Cu 2 O into In 2 O 3 and using absolute alcohol as a disperser. The photocatalyst was characterized by X-ray powder diffraction, UV-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, terephthalic acid photoluminescence probing technique, photoluminescence emission spectra, and transmission electron microscopy. The results showed that the photocatalytic activity of the Cu 2 O/In 2 O 3 was much higher than that of In 2 O 3 on the photocatalytic reduction of Cr 2 O 2- 7 . However, the photocatalytic activity was much lower than that of In 2 O 3 on the photocatalytic oxidation of methylene blue. Namely, Cu 2 O/In 2 O 3 has higher photocatalytic reduction activity but lower photocatalytic oxidation activity. For the photocatalytic reduction of Cr 2 O 2- 7 , the optimum amount of doped Cu 2 O is 0.5 wt %. Compared with pure In 2 O 3 , the photoabsorption wavelength range of the photocatalyst redshifts and improves the utilization of the total spectrum. The effect of ballmilling time on the photocatalytic activity was investigated. The mechanisms of influence on the photocatalytic activity were also discussed by the p-n junction principle and the valance band theory.