In_2TiO_5/In_2O_3异质结构的制备及光催化性能

Synthesis and Photocatalytic Property of In_2TiO_5/In_2O_3 Heterostructures

以酞酸丁酯和硝酸铟为起始物,甘氨酸为燃料,脱脂纤维为模板,采用自蔓延燃烧法制备了In2Ti O5/In2O3异质结构半导体光催化剂.利用X射线衍射仪、扫描电子显微镜、X射线能量色散谱仪、热重-差热分析仪、紫外-可见漫反射光谱仪和氮气吸附-脱附仪等对样品进行了表征.以罗丹明B(Rh B)为目标降解物,考察了催化剂的光催化性能.结果表明,在In/Ti摩尔比为2∶1、焙烧温度为800℃、焙烧时间为2 h条件下制备的介孔In2Ti O5/In2O3光催化材料在高压汞灯(125 W)辐照下,120 min可使10 mg/L Rh B的脱色率达到92.1%,降解过程服从一级动力学模型.在相同的光催化条件下,In2Ti O5/In2O3的光催化性能明显优于In2Ti O5,且In2Ti O5/In2O3光催化剂还具有一定的可见光催化活性.

In2Ti O5/ In2O3 heterostructures were synthesized by self-propagating combustion synthesis from raw materials Ti（ OC4H9）4,In（ NO3）3,glycine and absorbent fiber. The obtained sample was characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,energy-dispersive spectroscopy（ EDS） X-ray analysis,termogravimetric-differential thermal analysis（ TG-DTA）,UV-Visible diffuse reflectance spectroscopy（ UV-Vis DRS） and N2adsorption-desorption isotherms. With Rhodamine B（ Rh B） as a model degradation compound,the photocatalytic activity of In2 Ti O5/ In2O3 was investigated. The results showed that the mesoporous In2 Ti O5/ In2O3 heterostructures were synthesized when the n（ In） / n（ Ti） ratio was 2∶ 1,the calcination temperature was 800 ℃ and the calcination time was 2 h. The In2 Ti O5/ In2O3 heterostructures exhibited high photocatalytic activity under the irradiation of high pressure mercury lamp（ 125 W）. The decolorization rate of10 mg / L Rh B can be up to 92. 1% after 120 min of irradiation and the degrading reaction of Rh B fits the firstorder kinetic model. The photocatalytic performance of In2 Ti O5/ In2O3 heterostructures was better than that of In2 Ti O5under the same conditions. The In2 Ti O5/ In2O3 heterostructure also has visible-light-driven photocatalytic activity.