摘要
通过缓慢氧化T iC合成了C掺杂的锐钛矿型T iO2(C-T iO2)催化剂,并采用BET液氮吸附、X射线衍射、扫描电镜和紫外-可见吸收光谱对C-T iO2催化剂的比表面积、物相、粒径和吸收波长阀值等结构性质进行了表征。以难降解的三氯乙酸为催化降解对象,测定了C-T iO2催化剂在可见光照射下的催化活性。实验结果表明,相对于锐钛矿型T iO2,C-T iO2的吸收边带发生了约36nm的红移,它在可见光照射下有催化活性,主要是因为C取代O后,C的p轨道与O的2p轨道杂化,使其禁带隙变窄;制备条件和反应溶液的pH影响C-TiO2催化剂的活性,在350℃焙烧8h制备的C-TiO2催化剂,当反应溶液的pH为9时,催化活性最高。
Anatase TiO2 doped with carbon （ C-Tit2 ） was prepared by mild oxidation of TiC in air. The prepared power was used as catalyst for photo-degradation of acetocaustin and was characterized by means of X-ray diffraction （ XRD ）, scanning electron microscopy （ SEM ）, UV-visible （ UV-Vis ） absorption spectroscopy and BET adsorption. Photocatalytic activity of catalyst was evaluated by photodegradation of acetocaustin （TCA）under visible light. Relatively to anatase Tit2, C-Tit2 showed 36 nm red shift in absorption sideband. Compared with nanocrystalline anatase Tit2, the C-Tit2 powder exhibited photoactivity for TCA degradation under visible light. When Tit2 was doped with C ,p orbits of C atoms mixed with 2p orbits of O atoms to narrow the band-gap, which could response to visible light. The highest photo-degradation activity for TCA could be reached under the conditions：C-Tit2 prepared at 350℃ for 8 h and pH of reaction solution 9.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第5期488-492,共5页
Petrochemical Technology
关键词
二氧化钛
碳掺杂
三氯乙酸
光催化
锐钛矿
降解
titania
carbon doping
acetocaustin
photocatalysis
anatase
degradation
