复合顺序对三维花状TiO2-FeOOH复合材料吸附及光催化性能的影响

摘要

The TiO2-FeOOH composites with different recombination order were prepared on the surface of activated carbon (AC)by molecular self-assembly method using TiO2 and Fe (NO3)3 · 9H2O as precursors.Their adsorption and photoeatalytic properties to methyl orange (MO) were studied.The experimental results showed that the TiO2-FeOOH composites were anatase TiO2 and α-goethite composite layers which present 3D flower-like hierarchical structure with a diameter of 200-300 nm.This specific structure favored the synergy of adsorption and photocatalysis.The UV-Vis spectrum showed that TiO2-FeOOH composites reduce the band gap of TiO2.But after the MO solution with 10 mg/L of mass concentration had treated by TiO2/FeOOH/AC,TiO2/FeOOH/AC and TiO2/AC for 6 h,the decolorization rate was 78.8％,33.9％,57.5％,respectively.This result inferred that the recombination order had a significant impact on interfacial electron transfer process and photocatalytic property of the TiO2-FeOOH composites.%以TiCl4为钛源、Fe (NO3)3·9H2O为铁源,采用分子自组装法在活性炭表面制备了不同复合顺序的TiO2-FeOOH复合材料,研究了其对甲基橙的吸附和光催化性能.实验结果表明,TiO2-FeOOH复合材料由锐钛矿TiO2和α-针铁矿复合层组成,并呈直径为200～300 nm的三维花状多级结构,这种独特的多级结构有利于实现吸附与光催化的协同作用.UV-Vis吸收光谱显示TiO2与FeOOH的复合减小了TiO2的禁带宽度,但TiO2/FeOOH/AC、TiO2/FeOOH/AC和TiO2/AC对质量浓度为10 mg/L的甲基橙溶液处理6h后,溶液脱色率分别为78.8％,33.9％,57.5％,表明复合顺序对TiO2-FeOOH复合材料的界面电子传递过程及光催化性能有重大影响.