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采用模板法与溶胶-凝胶法相结合的方法,以羽状网脉的洋槐树叶为模板制备出网状的二氧化钛光催化材料.利用红外光谱仪(FT-IR)、扫描电子显微镜(SEM)、能量色散型X射线光谱仪(EDX)、X射线衍射仪(XRD)对样品的表面形貌、成分和晶型进行表征,以甲基橙的脱色降解为模式反应,考察了宏观形貌对TiO2光催化性能的影响.结果表明:以树叶为模板制得的TiO2,呈网状结构,网孔直径约为5～10μm,且有少量直径约为2～3μm规则球形和直径约5μm管状的TiO2;当pH=3时,网状TiO2在3h内对甲基橙的降解率分别比粉末TiO2高37.2%,比商品粉末TiO2高44.6%,且重复使用4次后,降解率仍能保持在90%以上,明显优于粉末TiO2,同时为制备其它形貌的TiO2提供一种新思路.
Mesoporous titanium dioxide photocatalytic materials were prepared by the template method and sol-gel method using the acacia leaves of pinnate veins as template.The structures of the photocatalytic materials were characterized by FT-IR, SEM, Dispersive X-ray spectroscopy (EDX) and X-ray diffractometer (XRD) were used to characterize the surface morphology, composition and crystal form of the samples. Decolourization and degradation of methyl orange were taken as the mode reaction. The results showed that the TiO2 as a template obtained from the leaves showed a network structure with a mesh diameter of about 5 to 10 μm and a small amount of regular spherical with a diameter of about 2 to 3 μm and a tubular TiO2 with a diameter of about 5 μm. When pH = 3, the degradation rate of methyl orange in mesh-like TiO2 was 37.2% higher than that of powder TiO2 and 44.6% higher than that of commercial TiO2 in 3h, respectively, and the degradation rate could still be above 90% , Which is obviously better than that of powder TiO2. At the same time, it provides a new idea for the preparation of TiO2 with other morphologies.