铁酸锌掺杂纳米二氧化钛的制备及其光催化活性

 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ZnFe₂O₄/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ZnFe₂O₄的掺杂对TiO₂催化活性的影响.结果表明,产物为纳米微粒,ZnFe₂O₄的掺杂能加快TiO₂的晶型转变速度,减小TiO₂的粒径,提高TiO₂的光催化活性.

Preparation and the photocatalytic property of nano-sized ZnFe2O4 - doped TiO2

Nano-sized TiO₂ and ZnFe₂O₄-doped TiO₂ were prepared from Ti(OC₄H₉)₄ and ZnFe₂O₄ by sol-gel method,where Ti(OC₄H₉)₄ and ZnFe₂O₄ 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 TiO₂ and ZnFe₂O₄/TiO₂ were examined by XRD and TEM.The results show that the product made by sol-gel method is nano-sized,the adulteration of ZnFe₂O₄ accelerates the transition of TiO₂ and decreases the particle size of TiO₂ from 25nm to 15nm.The activities of photocatalytic oxidation of ZnFe₂O₄ doped TiO₂ was studied by the degradation of Rhodamine B.The factors such as calcining temperature and the dopingamount of ZnFe₂O₄ 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 ZnFe₂O₄ increases the photocatalytic activity of TiO₂.