镧硫共掺杂纳米二氧化钛的制备及应用

采用溶胶-凝胶法制备La／S／TiO2光催化剂，以甲基橙溶液为目标降解物，利用正交试验考察n（La）／n（S）值、抑制剂投加量、凝胶温度及煅烧温度等因素对所制催化剂降解甲基橙效果的影v向．对所制催化剂进行XRD、UV—Vis表征，并对最佳工艺条件下制备的La／S／TiO2光催化剂进行单因素应用条件优化，，试验结果表明，在n（La）／n（S）值为1：1，抑制剂冰醋酸的投加量为6．4mL，凝胶温度为35℃，煅烧温度为500℃的条件下制备出的催化剂粒径为4．6mm，其对光吸收具有明显红移；当催化剂投加量为10g／L．电子受体H2O2的投加量为5mL／L，反应时间为120min，体系温度为25℃的各件下，采用可见光照射处理质量浓度为20mg／L的甲基橙溶液，降解率可达90％以上、

Preparation and application of La-S co-doped nano-TiO2

La/S/Ti02 photocatalyst was prepared by sol-gel method. With methyl orange as target product, erties of the photocatalyst were characterized by XRD and UV-Vis, and then, the single factor application condition of the La/S/TiO2 photoeatalyst prepared under optimal condition was optimized. The results of the test showed that, under the preparation conditions with n（La）/n（S） value of 1 ： 1, acetic acid dosage of 6.4 mL, gel temperature of 35 ℃, and caleinations temperature of 500 ℃, the prepared catalyst had a particle diameter of 4.6 nm, and the absorption edge of it shifted remarkably towards to longer wavelength. Under the condition that, the catalyst and H202 dosage were 10 g/L and 5 mL/L respectively, the reaction time was 120 min, and the system temperature was 25℃, the degradation rate of methyl orange in the methyl orange solution with mass concentration of 20 mg/L reached above 90% under visible light irradiation.