摘要
利用固态反应耦合焙烧或稀酸处理过程制备纳米二氧化钛,考察其催化反应性能。结果表明:在合成过程中碱度控制着二氧化钛的结晶形态,低碱度得到纯的锐钛矿,而高碱度则呈现出板钛矿和锐钛矿的混晶结构;酸处理过程中硝酸起到调变中间产物晶相转化的功能;银的修饰尽管降低了TiO2的比表面,但银与TiO2之间较强的相互作用,使二氧化钛的还原温度明显降低,光催化活性显著提高。
Nano-TiO2 was synthesized via solid state reaction coupled with calcination or diluted acid treatment method respectively. The catalytic properties were investigated. The results show that the crystal phase is controlled by alkali quantity. The anatase titania was obtained at low OH-/Ti4 ratio and the mixture between anatase and brookite was shown at high OH-/Ti4＋ ratio. The phase transformation was controlled by nitric acid. The loading of silver resuhs in the decrease of specific surface area. While the interaction between the titania and silver can inhibit the sintering of titania during the calcination process and decrease the reduction temperature of titania. Thus, the photocatalysis activity is dramatically increased.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第6期174-178,共5页
Journal of China University of Petroleum(Edition of Natural Science)
基金
中央高校基本科研业务费专项课题(27R1004050A)
青岛市科技计划项目
关键词
纳米二氧化钛
固相反应
相态转化
光催化
nano-titania
solid state reaction
phase transformation
photocatalysis
