以水热法制得的炭球为模板,通过酸催化水解法在其表面合成TiO2前驱体壳层,经煅烧除去炭球,最终制得中空TiO2微球。使用SEM、TEM、XPS、XRD及N2吸附-脱附等手段对产物进行结构表征。以苯酚为模型物在紫外光下对其活性进行评价。结果表明,经煅烧后TiO2前驱体实现由无定形向锐钛矿相的转变,炭球烧蚀,从而生成具有中空结构的TiO2微球。随葡萄糖溶液浓度增加,炭球直径增加,TiO2中空微球的球径也随之增加。通过调整葡萄糖溶液浓度可以对TiO2中空微球尺寸进行控制。当葡萄糖溶液浓度为0.7mol/L时,最终所得TiO2中空微球直径约为200nm,壁厚约为28nm,比表面积为66.6m2/g,孔径为6.56nm,整体排布平整。煅烧温度为600℃的TiO2中空微球对苯酚去除率最高,可达81.5%,为同法制备的非空心TiO2的1.35倍。
TiO2 hollow spheres were synthesized by combined acid catalytic hydrolysis-hydrothermal method. TiO2 precursor was deposited on the surface of carbon spheres obtained by hydrothermal method using glucose as starting material. SEM, TEM, XPS, XRD and N2 adsorption-desorption were used to characterize the samples. TiO2 hollow spheres were obtained by calcination under atmosphere after the core carbon sphere was burnt off and TiO2 precursor trasformes from unerystalline to anatase simultaneously. The results revealed that the size and surface morphology of TiO2 hollow spheres can be controlled by adjusting the concentration of glucose aqueous solution. With the increasing of cocentration of glucose solution, the diameter of TiO2 hollow sphere increased. TiO2 hollow sphere prepared with glucose concentration of 0.7mol/L was size uniform, with the diameter of 200nm, and the thickness of TiO2 shell 28nm. The photocatalytic activity of TiO2 hollow sphere is higher than TiO2 made by the same method without using template (TiO2-G600). The phenol removal rate of the sample prepared by calcination at 600℃ is as 1.35 times high as that of TiO2-G600.
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