微/介孔氮掺杂TiO_2的合成与表征及催化性能的研究

Study on the synthesis of mirco/mesoporous composite N-doped TiO_2 and the performance of photocatalysis

以碱处理后的13X分子筛、硅酸钠为原料,加入模板剂和钛酸四丁酯,同时引入氮源,在水热条件下晶化生成具有良好的光催化性能的新型微/介孔氮掺杂TiO2复合材料。通过XRD、TEM、N2吸附-脱附等技术对复合材料的微观结构进行了表征分析;通过降解邻苯二甲酸二丁酯实验检测复合材料的催化性能和影响复合材料合成中的各项因素,如硅铝比、氮钛比、合成体系pH、晶化时间、煅烧温度等,确定了最佳的制备工艺参数。结果表明:通过氮掺杂能引起复合材料的激发吸收光谱明显红移并具有较好的可见光催化活性。

A new kind of Mirco/mesoporous Composite N-doped TiO2was synthesized with alkali treatment of 13 X molecular sieve,sodium silicate as raw materials,adding organic template and Ti[O（CH2）3CH3]4,then introducing the nitrogen source under hydrothermal condition.Many techniques such as XRD,TEM,N2 adsorption-desorption were used to characterize the microstructure of the composite material.The degradation experiments of Di-n-butyl phthalate（DBP） were carried out to test the catalytic activity of the composite material and optimize the experimental conditions such as Si/Al（molar ratio）,pH value,N/Ti（molar ratio）,crystal duration and calcination temperature.The results indicate that the N-doping can make the light absorption of the photocatalyst obviously extended into visible-light region,and increase the visible-light photocatalytic activity.