Ti^(3+)自掺杂TiO_2光催化剂的制备及光催化性能研究  

Preparation and Properties of Ti^(3+) Self-doped TiO_2

作　　者：陈明淦 曾令可[1] 王慧[1] Chen Minggan;Zeng Lingke;Wang Hui(Materials Science and Engineering School,South China University of Technology,Ouangzhou,510640)

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《陶瓷》2018年第11期25-31,共7页Ceramics

摘　　要：光催化效应因其在能源、环境方面的广泛用途而受到广泛关注,二氧化钛(TiO_2)作为被发现的第一种光催化剂,一直以来都是学者们研究的热点。但是TiO_2的光吸收带在紫外波段以及光催化效率低下的两个缺点,阻碍了人们对TiO_2的光催化应用和开发。近期,有学者发展了Ti ^(3+)自掺杂TiO_2作为改性的方法,取得了突破性的进展。但是,Ti ^(3+)自掺杂的过程依然具有能耗大、不确定性高等缺点。笔者简述了使用简便的固相高温局部还原法制备Ti ^(3+)自掺杂TiO_2。利用NaBH_4作为还原剂,在惰性气氛条件下高温还原生成Ti ^(3+)和氧空位,制得Ti ^(3+)自掺杂TiO_2。并讨论Ti ^(3+)自掺杂TiO_2的结构以及光催化性能。本实验制得的Ti ^(3+)自掺杂TiO_2具有光子转换效率高、光吸收带向可见光转移等优点,并具有良好的光催化还原Cr^(6+)的性能,3h可见光催化还原效率达到90%以上,具有较高的研究和实际意义。Photocatalysis has attracted wide attention clue to its wide range of applications in energy and environment. Titani um dioxide （TiO2） , as the first photocatalyst to be discovered, has been a research hotspot for many scholars. However, the shortcomings of TiO2 which are the absorption band of TiO2 is in the ultraviolet region and the low photocatalytic effi ciency, have hindered people to apply and develop TiO2. Recently, some scholars have developed Ti3＋ self doped TiO2 as a method of modifying TiO2. However, Ti3＋ self doped TiO2 still has many disadvantages, such as high energy con sumption and high uncertainty during its preparation. This paper briefly describes a facile process which uses solid state and high temperature reduction method to prepare Ti3＋ self doped TiO2. Ti3＋ and oxygen vacancies were formed by high temperature reduction on an inert atmosphere to obtain Ti3＋ self doped TiO2 using NaBH, as the reducing agent. And the structure and photocatalytic properties of Ti3＋ self doped TiO2 were discussed. The Ti3＋ self doped TiO2 pre pared in this experiment has the advantages of high photon conversion efficiency, the transfer of light absorption band to the region of visible light, and good photocatalytic performance to reduce Cr6＋ whose efficiency in 3 hours is more than 90%. Thus, it is significant for research and practical applications.

关 键 词：二氧化钛 Ti^3+自掺杂 光催化 Cr^6+还原 

分 类 号：TQ174.758.23[化学工程—陶瓷工业]