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以芭蕉叶作为结构模板,通过微波辐照-HCl耦合预处理、原位生长及变温去模板过程,制备了具有分级多孔结构的TiO2光催化材料.通过环境电子扫描显微镜(FESEM)、透射电镜(TEM)、X射线衍射(XRD)及N2吸附-脱附表征.结果表明:芭蕉叶-TiO2材料不仅具有模板的维管束管状结构、大孔阵列及管壁内外宽度为100 nm左右的层状褶皱结构,而且还具有典型的介孔结构,平均孔径为13.03 nm,材料比表面积为66.5 m2 g-1.以染料亚甲基蓝(MB,C16H18ClN3S 3H2O)作为模型,评价材料的吸附性能和光催化性能.结果显示:与DegussaP25及无模板的普通TiO2相比,芭蕉叶-TiO2表现出较强的吸附性能和光催化活性;对亚甲基蓝吸附率达30%,为P25的4.3倍,普通TiO2的15倍;其光催化速率分别为P25和普通TiO2的1.5倍和4倍之多.
The photocatalytic material of TiO2 with hierarchical porous structure was prepared by using banana leaves as the structural template, pretreatment by microwave irradiation-HCl coupling, in-situ growth and temperature change to the template process. The photocatalytic activity of TiO2 photocatalytic material with hierarchical porous structure was investigated by means of environmental electron microscopy (FESEM), transmission electron microscopy TEM, XRD and N2 adsorption-desorption. The results show that the banana leaf-TiO2 material not only has the vascular bundle structure of the template, but also the macropore array and the layered fold with the width of about 100 nm Structure, but also has the typical mesoporous structure with an average pore diameter of 13.03 nm and a specific surface area of 66.5 m2 g-1. The adsorption and photocatalytic properties of the material were evaluated with methylene blue (MB, C16H18ClN3S 3H2O) : Compared with Degussa P25 and template-free ordinary TiO2, banana leaf-TiO2 possesses strong adsorption performance and photocatalytic activity; the adsorption rate of methylene blue is 30%, which is 4.3 times that of P25 and 15 times that of common TiO2; Rate of P25 and ordinary TiO2 were 1.5 times and 4 times.