复合顺序对三维花状TiO_2-FeOOH复合材料吸附及光催化性能的影响

以TiCl_4为钛源、Fe(NO_3)3·9H_2O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TiO_2-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,TiO_2-FeOOH复合材料由锐钛矿TiO_2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TiO_2与FeOOH的复合减小了TiO_2的禁带宽度,但TiO_2/FeOOH/AC、TiO_2/FeOOH/AC和TiO_2/AC对质量浓度为10 mg/L的甲基橙溶液处理6 h后,溶液脱色率分别为78.8%,33.9%,57.5%,表明复合顺序对TiO_2-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。

Effect of recombination order on adsorption and photocatalytic properties of 3D flower-like TiO2-FeOOH composites

The TiO₂-FeOOH composites with different recombination order were prepared on the surface of activated carbon （AC）by molecular self-assembly method using TiO₂and Fe（NO₃）3·9H₂O as precursors. Their adsorption and photocatalytic 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.