A novel series of photocatalysts, bismuth oxyhalide （BiOX, X = Cl, Br, and Ⅰ）, were synthesized by a hydrolysis method. The powder sampies were characterized by the use of X-ray diffraction （XRD）, scanning electr...A novel series of photocatalysts, bismuth oxyhalide （BiOX, X = Cl, Br, and Ⅰ）, were synthesized by a hydrolysis method. The powder sampies were characterized by the use of X-ray diffraction （XRD）, scanning electron microscope, and UV-Vis spectrophotometer. The XRD pattern showed that all the BiOX were well crystallized in the tetragonal structure. The band gaps of the sheet-shaped compounds BiOX （X = Cl, Br, andⅠ） were 3.44, 2.76, and 1.85 eV, respectively. BiOBr showed the highest photocatalytic activity in degrading rhodamine B （RhB） and evolving 02 for its proper valence band （VB）. BiOI has no photocatalytic activity. BiOCl showed the highest activity in decomposing isopropanol because of electron-hole pair separation through trapping electrons by oxygen vacancies.展开更多
基金This study was financially supported by the National Natural Science Foundation of China(No.50471004)the Program for New Century Excellent Talents in Universities,and the Foundation from Engineering Research Institute,Peking University(No.204031)
文摘A novel series of photocatalysts, bismuth oxyhalide （BiOX, X = Cl, Br, and Ⅰ）, were synthesized by a hydrolysis method. The powder sampies were characterized by the use of X-ray diffraction （XRD）, scanning electron microscope, and UV-Vis spectrophotometer. The XRD pattern showed that all the BiOX were well crystallized in the tetragonal structure. The band gaps of the sheet-shaped compounds BiOX （X = Cl, Br, andⅠ） were 3.44, 2.76, and 1.85 eV, respectively. BiOBr showed the highest photocatalytic activity in degrading rhodamine B （RhB） and evolving 02 for its proper valence band （VB）. BiOI has no photocatalytic activity. BiOCl showed the highest activity in decomposing isopropanol because of electron-hole pair separation through trapping electrons by oxygen vacancies.
