采用双层包裹-夹层去除法合成了SiO2-void-TiO2中空核壳微球,通过正十八烷基三甲氧基硅烷对SiO2-void-TiO2微球表面进行部分修饰,制得了双亲性w/o-SiO2-void-TiO2中空核壳微球,并采用XRD、TEM、BET、FT-IR和UV-Vis DRS等对样品的晶相结构、形貌、表面结构和吸光性能等进行了表征.以染料亚甲基蓝模拟环境污染物,考察了SiO2-void-TiO2和w/o-SiO2-void-TiO2在紫外光下的光催化性能.结果表明:SiO2-void-TiO2样品呈微球状,具有明显的核-多孔壳结构,在核与多孔壳层之间存在纳米空间层,样品中TiO2核具有锐钛矿结构;w/o-SiO2-void-TiO2样品具有双亲性,能分布于水/油两相界面处.在紫外光照射下,反应180 min,SiO2-void-TiO2和w/o-SiO2-void-TiO2对亚甲基蓝的降解率分别达89.4％和83.8％.在此基础上,本研究探讨了SiO2-void-TiO2中空核壳微球的合成机理及表面部分改性机理.
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