水分散性N掺杂TiO_2的制备及其光催化性能研究  

Synthesis and Photocatalytic Activity of N-doped Water-Dispersible TiO_2

作　　者：曹永倩[1] 樊彩梅[1] 王雅文[1] 王韵芳[1] 张小超[1] 

机构地区：[1]太原理工大学化学化工学院,太原030024

出　　处：《人工晶体学报》2016年第4期1120-1125,1137,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(21303116);山西省青年科技研究基金(2013021011-2);山西省高等学校优秀青年学术带头人支持计划(154010141-s)

摘　　要：采用多羟基法一步合成了具有可见光催化活性的水分散性N掺杂TiO_2纳米颗粒,其中四异丙醇钛(TTIP)作为钛源,二乙二醇(DEG)作为反应溶剂,谷氨酸作为表面修饰剂和氮源。所得TiO_2纳米颗粒在p H≥6.54的水溶液中可以很好的分散,并能稳定保持一星期。以甲基橙为目标降解物,研究了水分散性N掺杂TiO_2在可见光下的光催化活性。结果显示,与未经掺杂的TiO_2相比,所制得的N掺杂TiO_2有良好的可见光催化活性。除此之外还通过改变气体氛围和添加捕获剂对水分散性N掺杂TiO_2降解甲基橙(MO)的光催化机理进行了研究。本方法制备的TiO_2因具有优越的水分散性和良好的可见光催化活性,在光动力治疗(PDT)中有极好的应用前景。A one-step polyol process to directly synthesize water-dispersible N-doped TiO2 nanoparticles with excellent visible light photocatalytic ability by employing TTIP as the titanium source,diethylene glycol（ DEG） as the solvent and glutamic acid as the surface modifier and nitrogen source. The obtained TiO2 nanoparticles were well dispersible in water at pH ≧ 6. 54 and the resulting aqueous dispersion remains stable for a week. The photocatalytic activities were evaluated via the degradation rate of methyl orange under visible light irradiation. The result reveals that the water-dispersible N-doped TiO2 nanoparticles had excellent visible light photocatalytic activity compared with the un-doped TiO2. In addition,the mechanism of photocatalytic activity was investigated through gas atmosphere changing and active species capturing test. Owing to the excellent water-dispersibility and visible light photocatalytic activity,the obtained water-dispersible N-doped TiO2 had potential to be used in photodynamic therapy（ PDT）.

关 键 词：N掺杂TIO2 多羟基法一步合成 水分散性 可见光 

分 类 号：O643[理学—物理化学]