掺磷纳米TiO_2的制备及其在染料降解中的应用

Preparation of nano-titanium dioxide doping phosphorus and its application in degradation of dyes

采用溶胶-凝胶法合成了纳米TiO2光催化剂,以钛酸丁酯为前驱物,无水乙醇为溶剂,冰醋酸为抑制剂,探讨了不同反应条件(温度、pH、助剂用量等)对其凝胶时间的影响,在此基础上制备了掺磷纳米TiO2.利用XRD、UV-vis等测试技术研究了纳米TiO2的形态结构,并利用制备的粉体进行了甲基橙紫外光光催化试验.结果显示:制备透明稳定凝胶的最佳条件是将去离子水滴加到混合了钛酸丁酯的乙醇溶液中,并控制温度在40℃,pH为2.5,n(钛酸丁酯)∶n(无水乙醇)∶n(水)∶n(冰醋酸)=1∶25∶5∶1.5,得到的凝胶透明度好;掺磷量为4%时,制备的粉体紫外光光催化活性最好.

The nano-crystalline TiO2 photocatalyst was synthesized using Ti（OBu）4 as precursor,C2H5OH as solvent,and glacial acetic acid as inhibitor.The effects of reaction temperature,pH and assistant dosage on the gelation time were investigated,and the nano-titanium dioxide doping phosphorus was prepared.The morphology of nano-TiO2 was studied using X-ray diffraction（XRD） and ultraviolet-visible（UV-vis） spectrophotometer.The photocatalytic experiment was carried out by investigating the photodegradation of methyl orange.The results showed that the optimum reaction conditions for preparing transparent stable TiO2 gelation was： deionized water was dropwised into the mixture of Ti（OBu）4 and alcohol,the temperature was controlled at 40 ℃,the pH of solution was 2.5,the molar ratio of Ti（OBu）4：C2H5OH∶H2O∶CH3COOH was 1∶25∶5∶1.5.The prepared powder had best UV photocatalysis activity when the dosage of doping phosphours was 4%.