La^(3+)、Nd^(3+)与非金属氮共掺杂TiO_2光催化剂的制备及其性能研究

Preparation and photocatalytic properties of La^(3+),Nd^(3+) and non-metallic N doped TiO_2

采用溶胶-凝胶法制备了Ti O2、1%La/Ti O2、1%Nd/Ti O2和系列稀土La3+和Nd3+共掺杂Ti O2光催化剂,进而结合水热法制备了双稀土La3+、Nd3+和非金属氮共掺杂多元体系Ti O2光催化剂,并采用XRD、UV-Vis、SEM和XPS等测试手段对制备样品的微观结构、光谱学性能和离子掺杂形式进行了表征。研究表明,实验所制备样品均为锐钛矿型Ti O2光催化剂,稀土离子La3+或Nd3+的掺杂能有效抑制Ti O2颗粒尺寸的生长,而且双稀土离子的共掺杂更有效抑制Ti O2光催化剂颗粒尺寸的生长;非金属离子N的掺杂,能有效拓宽Ti O2光催化剂的光响应范围;多元体系Ti O2光催化剂中,稀土钕以+3形式掺杂,非金属氮以-3形式掺杂。实验以甲基橙为目标污染物研究其光催化性能,研究表明,所制备的光催化剂均有较高的紫外光光催化性能,其中样品1%(La∶Nd,1∶7),N/Ti O2的紫外光光催化性能最高,而且有较强的可见光光催化活性。

TiO2,1%-La /Ti O2,1%-Nd /Ti O2 and a series of La3 +and Nd3 +doped Ti O2 photocatalysts were prepared by sol-gel method. Then,sol-gel method combined with hydrothermal method synthesized multi system of rare earth La,Nd,and nitrogen-doped Ti O2 photocatalysts. Their microstructure,spectroscopic properties and ion doped form were characterized by X-ray powder diffraction( XRD),UV-Vis diffuse reflectance spectroscopy techniques,scanning electron microscopy( SEM),X-ray photoelectron spectroscopy( XPS). The catalytic activity was tested for the degradation of methyl orange solution. The results showed that,all the samples which prepared in paper were Anatase Ti O2 photocatalysts,the doping of La3 +or Nd3 +could hinder the growth of Ti O2 particle,even,the doping of La3 +with Nd3 +together could more effective hinder the growth of Ti O2particle; Non-metallic nitrogen-doped would broaden the Light response range of Ti O2 photocatalyst. At the same time,the activity results indicated that the prepared samples showed superior UV light photocatalytic activity,the sample 1%-( La∶ Nd,1 ∶ 7) N / Ti O2 possessed the highest UV-Vis photocatalytic activity.