以钛酸四正丁酯作为钛源, 十八烷基胺为模板剂, 采用溶胶凝胶法结合水热反应法合成了TiO2 纳米球, 并考察了煅烧温度对TiO2 纳米球形貌的影响. 结果表明, 当煅烧温度为350 C 时, 所制备的TiO2 纳米球具有最佳形貌, 且其比表面积可达159.878 m2/g, 约为目前商用TiO2 P25(54.041 m2/g)的3 倍. 另外, 通过Cr(VI)和双酚A (bisphenol A, BPA)的可见光降解实验, 对所制备的TiO2 纳米球的光催化性能进行了测试. 结果表明, TiO2 纳米球在可见光条件下可有效降解水体中的Cr(VI)和BPA; 此两种污染物的降解呈现协同效应, 且TiO2 纳米球的比表面积决定了其光催化性能, 在350 C煅烧条件下制备的TiO2 纳米球具有最优的光催化性能.
Titanium dioxide (TiO2) nanospheres were successfully synthesized by sol-gel combination with hydrothermal treatment using octadecylamine template and tetrabutyl titanate precursor, and the effects of calcination temperature on the morphology of titanium dioxide. The results show that at the calcination temperature of 350 C, the prepared TiO2 nanospheres get the best morphology and their specific surface area can reach 159.878 m2/g, three time higher than that of Degussa P25 (54.041 m2/g). Moreover, photocatalytic properties of the TiO2 nanospheres were tested through degradation of Cr(VI) and bisphenol
A (BPA) under visible light. The results show that the TiO2 nanospheres can effectively degrade Cr(VI) and BPA in water, and the two pollutants’ degradation has synergistic effect. In addition, TiO2 nanospheres surface area determines its photocatalytic properties, and TiO2 nanospheres prepared under 350 C calcination conditions have optimal photocatalytic.
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