铁酸锌掺杂纳米二氧化钛的制备及其光催化活性

Preparation and the photocatalytic property of nano-sized ZnFe_2O_4-doped TiO_2

以钛酸四丁酯和自制铁酸锌为原料 ,采用溶胶 -凝胶法制备了未掺杂的TiO2 和掺杂不同量的ZnFe2 O4/TiO2 纳米粉体 ,通过XRD、TEM对产物的晶体结构、晶粒大小、形貌进行了表征 ,通过对罗丹明B的光催化降解实验研究了ZnFe2 O4的掺杂对TiO2 催化活性的影响 .结果表明 ,产物为纳米微粒 ,ZnFe2 O4的掺杂能加快TiO2 的晶型转变速度 ,减小TiO2 的粒径 ,提高TiO2

Nano-sized TiO_2 and ZnFe_2O_4-doped TiO_2 were prepared from Ti(OC_4H_9)_4 and ZnFe_2O_4 by sol-gel method,where Ti(OC_4H_9)_4 and ZnFe_2O_4 were used as principle precursors,isopropanol was used solvent and hydrochloric acid was used to adjust the number of pH to about 3.The structure,size and the appearance of TiO_2 and ZnFe_2O_4/TiO_2 were examined by XRD and TEM.The results show that the product made by sol-gel method is nano-sized,the adulteration of ZnFe_2O_4 accelerates the transition of TiO_2 and decreases the particle size of TiO_2 from 25?nm to 15?nm.The activities of photocatalytic oxidation of ZnFe_2O_4 doped TiO_2 was studied by the degradation of Rhodamine B.The factors such as calcining temperature and the dopingamount of ZnFe_2O_4 were investigated.The results indicate that 500℃ is the optimum calcining temperature and the optimum doping amount is 0.5%.When the adulterate amount 1.5%,rutile phase was found in the product.It was possible that a semiconductor was formed.The experiments of the degradation of rhodamine B show that the adulteration of ZnFe_2O_4 increases the photocatalytic activity of TiO_2.