摘要
以钛酸四丁酯(TBT)为原料,利用溶胶–凝胶法、小孔干燥和老化液浸泡工艺在常压下制备出了完整、无开裂的TiO2气凝胶块体.研究了小孔干燥和老化液浸泡技术对常压制备TiO2气凝胶的影响,研究结果表明:小孔干燥能够降低TiO2醇凝胶干燥过程中所受的不均匀收缩应力,而TBT醇溶液和TEOS醇溶液浸泡处理,能够增强凝胶的骨架强度,有助于减轻凝胶在干燥过程中的收缩和开裂,制备出完整的高性能TiO2气凝胶块体.基于小孔干燥和TEOS乙醇溶液浸泡老化处理,制备得到的高性能完整TiO2气凝胶块体,其密度为0.184 g/cm3,比表面积达389.5 m2/g.用高温煅烧后的锐钛矿相TiO2气凝胶催化降解渤海原油污水模拟溶液,在TiO2气凝胶加入量为400 mg/L的情况下,90 min内对渤海原油污水的去除率最高可达91%.
The monolithic TiO2 aerogel was sucessfully synthesized at ambient pressure tbxough Sol-Gel technique with TBT as the raw material and its photocatalyst property for degradation of the aqueous emulsion of crude oil in the Bohai Sea was investigated. During the ambient drying process, aging liquor and pinhole drying technology were found to be critical to the properties of TiOz aerogels. It was shown that the pinhole drying was favorable in reducing the asymmetric stress on the framework of TiO2 gel in the drying process and the TEOS-Ethanol or TBT-Ethanol solu- tion as the aging liquor for TiO2 wet-gel could enhance the strength of TiO2 gel skeleton. Combining these effects, the cracking problem of TiO2 alcohol gel in the drying could be solved and the high-performance TiO2 aerogel monolith was eventually achieved. The most integrated TiO2 aerogel block exhibited low density （0.184 g/cm3） and high specific surface area （389.5 m2/g）. By calcinations at high temperature, the TiOe aerogels changed from amorphous to anatase structure. The photocatalytic properties of the heat-treated TiO2 aerogels were investigated via the degradation experi- ment for the aqueous emulsion of crude oil in the Bohai Sea. The results of photocatalytic experiments showed that the catalytic degradation rate was up to 91% with the addition of TiO2 aerogel of 400 mg/L.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第11期1153-1158,共6页
Journal of Inorganic Materials
关键词
TiO2气凝胶
常压
小孔干燥
老化液
光催化
原油降解
TiO2 aerogel
ambient pressure
pinhole drying
ageing
photocatalystic
crude oil degradation
