摘要
以苯酚光催化氧化和铬酸根光催化还原反应为模型反应,研究不同粒径的金红石相二氧化钛纳米晶的光催化活性.用XRD,TEM和BET等表明超细金红石相二氧化钛的粒径为7～8 nm,UV-vis谱表明其吸收带边界蓝移11nm.在上述反应中,具有量子尺寸效应的金红石相二氧化钛(7nm)均表现出很高的催化活性,催化活性随粒径增大而迅速下降.7.2 nm的金红石相二氧化钛的光催化活性与6.8 nm的锐钛矿相二氧化钛相当.
The photocatalytic properties of rutile - type nanocrystalline TiO2 of different sizes have been investigated using the degradation of phenol and removal of chromate as model reactions. TEM, XRD and BET surface area results show that the particle size of the ultrafine rutile - type is about 7 similar to 8 nm, with an 11 run blue shift of the absorption band edge in the UV - vis spectra. The photocatalytic activity of the quantum sized TiO2 (7 m), which is comparable to that of 6. 8 nm anatase - type TiO2, is much higher than that of rutile - type TiO2 of larger sizes in both reactions.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2001年第11期1909-1913,共5页
Acta Chimica Sinica
基金
国家重点基础研究发展计划(973计划)
