石英基多层纳米TiO2-FeOOH复合材料的制备和 显微结构的表征

以石英玻璃片为基底,利用自组装技术在TiCl4-HCl体系中生长纳米TiO2,与在Fe(NO3)3-HNO3体系中生长纳米FeOOH制备负载型多层不同层序FeOOH-TiO2纳米复合薄膜光催化材料.高分辨透射电镜(HRTEM)表征结果显示:复合膜由纳米锐钛矿和针铁矿构成.UV-Vis表征结果显示:TiO2与FeOOH间的复合使TiO2吸收带均发生一定程度的红移,其中FeOOH/TiO2/FeOOH/TiO2和FeOOH/TiO2/FeOOH复合薄膜的吸收带分别为490 nm和498 nm;在以罗丹明B溶液为模拟废水的光催化实验中发现:负载FeOOH/TiO2/FeOOH/TiO2和FeOOH/TiO2/FeOOH的两种复合薄膜材料的光催化效果最佳;并且FeOOH膜在复合膜最外层比TiO2膜在最外层时光解效率高.具有一定吸附能力的针铁矿薄膜与TiO2薄膜的复合优化了复合膜内部微孔结构,促进两者间形成了积极地吸附-光催化耦合增强效应.

Study on the photocatalysis coupling enhancement effect of quartz based nano TiO2-FeOOH composite layer

Nano TiO2 and nano FeOOH grow in TiCl4 -HCl system and Fe ( NO3 ) 3-HNO3 system, respectively. Different sequence FeOOH-TiO2 nano composite thin film optical catalytic materials with quartz glass substrate were prepared by using the self-assembly technique. High resolution transmission electron microscopy characterization results show that the composite films are composed of nano anatase and goethite. The UV-Vis characterization results show that the composition of TiO2 and FeOOH makes the absorption bands of TiO2 red shifted to a certain degree, in which FeOOH/TiO2/FeOOH/TiO2 and FeOOH/TiO2/FeOOH composite films absorption band respectively visible range: 490 nm and 498 nm; The photocatalytic performance of FeOOH/TiO2/FeOOH/TiO2 and FeOOH/TiO2/FeOOH two kinds of photocatalyst composite films are the best when the degradation of Rhodamine B solution,and the FeOOH film in the outermost layer of the composite film was higher than that of the TiO2 film. The composition of FeOOH and TiO2 thin films optimizes the micropore structure of the composite films and promotes the formation of the coupling enhancement effect between the active adsorption and photocatalysis.