科研之友
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摘要
TiO2 nano-particles modified by cystine were prepared through a sol-gel procedure using cystine as the doping species and characterized by TG-DTA, XRD, Surface Photo-voltage Spectroscopy (SPS) and XPS. The XRD results show that cystine added in TiO2 preparation could effectively restrain the growth of crystallite and enhance the temperature of phase transformation. SPS results indicate that the light absorbance edge of cystine modified TiO2 nano-particles is obviously red-shifted to visible-light and the strongest signal intensity of photovoltaic response is given by modified TiO2 nano-particle with 4.2% cystine. XPS analysis implies that the content of surface hydroxyl increases significantly and VBM (Valance Bond Maximum) of O2p is 2.3 eV. The effects of calcination temperature and cystine content on the visible-light photocatalytic performance of modifed TiO2 for degrading RhB were investigated. The modified TiO2 calcined at 350 degrees Cwith 4.2% cystine content exhibits the best photocatalytic performance. When the irradiation wavelengths are 380 similar to 630 nm and 470 similar to 800 nm, the removal rate for RhB could achieve 91.02% and 78.44%, respectively.
- 出版日期2010-12-10
- 单位黑龙江大学
