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论文类型：期刊论文

发表时间：2011-05-17

发表刊物：LANGMUIR

收录刊物：Scopus、SCIE、EI、PubMed

卷号：27

期号：10

页面范围：6252-6259

ISSN号：0743-7463

摘要：Mesoporous SiO2/TiO2/Fe2O3 particles containing macropores of about 50 nm in diameter have been prepared by an aerosol process using cetyltrimethylammonium bromide (CTAB) as a templating agent. In contrast to the traditional templating effect of CTAB to form ordered mesoporous silicas, the morphology here is vastly different due to the presence of precursor iron salts. The particles have mesoporosity templated by CTAB but additionally have large voids leading to a combined macroporous and mesoporous structure. The morphology is explained through the formation of colloidal structures containing species such as CTA(+)X(-1)Fe(3+) colloids in the aerosol droplets, indicating of a salt bridging effect. This dual porosity has applied implications, as the macropores provide easy entry to the particle interior in potentially diffusion limited situations. Furthermore, the particles encapsulate Fe2O3 and contain TiO2 leading to the dual functional properties of magnetic response and photocatalytic activity,