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采用溶胶-凝胶法和胶态晶体模板法,制备了大孔TiO2-ZnO复合纳米材料。其晶相结构和形貌特征采用X射线粉末衍射(XRD)、透视电子显微镜(TEM)进行了表征,并以甲基橙为降解对象,对其光催化活性进行了研究。结果表明,采用无皂乳液聚合法得到的聚苯乙烯(PS)微球粒径均匀,为900nm。以紧密堆积的PS胶态晶体为模板,制得的TiO2-ZnO复合纳米材料的大孔孔径约为900nm,孔壁厚度约为20nm。XRD结果显示,材料中的TiO2为锐钛矿型。光催化降解结果表明,大孔TiO2-ZnO复合纳米材料对甲基橙降解1.5h后降解率可达91.3%,与普通的TiO2-ZnO纳米粉体材料相比提高了11.2%.
Macroporous TiO2-ZnO nanocomposites were prepared by sol-gel method and colloidal crystal template method. The crystal phase structure and morphology were characterized by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The photocatalytic activity of methyl orange was also studied. The results showed that polystyrene (PS) microspheres obtained by soap-free emulsion polymerization had a uniform particle size of 900 nm. With close-packed PS colloidal crystals as a template, the prepared TiO2-ZnO composite nanomaterials have a macropore diameter of about 900 nm and a pore wall thickness of about 20 nm. XRD results show that the TiO2 in the material is anatase. The results of photocatalytic degradation showed that the degradation rate of methyl orange by macroporous TiO2-ZnO nanocomposites reached 91.3% after degradation of methyl orange by 1.5h, which was 11.2% higher than that of ordinary TiO2-ZnO nanopowder.