Bi-N-TiO_2可见光催化剂降解酸性橙7

Degradation of acid orange 7 by Bi-N-TiO_2 catalyst under visible light

采用溶胶凝胶-水热合成结合法制备铋氮共掺杂二氧化钛纳米催化剂.以酸性橙7（AO7）为目标污染物,研究Bi-N-TiO2催化剂的可见光光催化活性,考察催化剂投加量、污染物初始浓度及pH值等条件对AO7脱色效率影响.结果表明：Bi-N-TiO2光催化剂在可见光（400 ～ 750 nm）照射6h后对AO7的去除率达到86.48％,比在同样条件下制备的单元素掺杂催化剂Bi-TiO2 （22.09％）、N-TiO2 （15.9％）以及TiO2（11.89％）、P25（14.12％）等表现出更好的可见光响应特征;当催化剂投加量为1g·L-1、AO7初始浓度为10mg·L-1、反应液pH值为3时催化剂光催化降解AO7的脱色效果最好;且可见光下Bi-N-TiO2催化剂具有一定的重复使用性和再生性能.

Based on the combination with sol gel and hydrothermal synthesis preparation bismuth nitro- gen doped TiO2 nanometer catalyst. Aiming at AO7 pollutants, Research the Bi - N - TiO2 visible light catalytic activity of the catalyst, Investigation catalyst dosing quantity, initial concentration of polluta- ntsand pH conditions affect AO7 decoloring efficiency. The results show that the Bi -N -TiOz photo- catalyst in the visible light （400 - 750 nm ） irradiation after 6 h of AO7 removal rate reached 86.48% , than under the same conditions of the preparation of single element doped catalysts Bi - TiO2 （22.09%）, N - TiO2 （ 15.9% ） and TiO2 （ 11.89% ）, P25 （ 14. 12% ） showed better visible light response characteristic. When the catalyst dosing quantity is 1 g · L-1, AO7 initial concentration for 10 mg · L- 1 and reaction liquid pH for 3, when catalyst photocatalytic degradation of AO7 best decoloring effect, and visible light Bi - N - TiO2 catalyst has certain repeated sexual and reproductive performance.