TiO2/SiO2 composite aerogels were prepared from ethyl orthosilicate (TEOS) and butyl titanate (TnBT) as raw materials,deionized water and absolute ethanol as solvent,hydrochloric acid,ammonia and formamide as the catalysts.The SiO2 and TiO2/SiO2 composite alcohol gels were prepared by acid/base two step sol-gel method.After aging,solvent replacement and other subsequent processes,TiO2/SiO2 aerogels were prepared by subcritical conditions.The aerogels were characterized by SEM,TEM,XRD,BET,TG-DSC and FT-IR.The prepared aerogels were used for ultraviolet photocatalytic degradation of methyl orange.The results shown that the aerogels with different TiO2/SiO2 ratios had a specific surface area of 480.61m2/g when n(Ti)∶n(Si)=1∶1 after being calcinated at 500℃.Its composition was amorphous SiO2 and anatase TiO2.UV-catalyzed degradation of methyl orange showed that the aerogels which prepared by subcritical drying had the catalytic degradation rate up to 99.6%,and exhibited excellent catalytic performance.
Zhang Song, Ding Chunhua, Jiang Hong, He Yuanzi, Wen Man
. Preparation of TiO2/SiO2 composite aerogel by subcritical method and its photocatalytic activity[J]. New Chemical Materials, 2020
, 48(11)
: 218
-222
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.11.048
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