掺杂Fe^(3+)纳米TiO_2的涂布纸可见光光催化剂的制备与表征

Preparation and Characterization of Fe^(3+) Doped Nanosized-TiO_2 Visible Light Photocatalyst for Paper Coating

本文在室温条件下通过原位复合法制备了一系列铁(Fe^(3+))掺杂(Fe^(3+)/TiO_2摩尔百分比浓度0.0-1.0at.%)纳米TiO_2光催化剂。利用SEM、XPS和UV-vis DRS作为表征手段,可见光(40 W白炽灯,主光源456 nm)甲醛降解实验评价Fe^(3+)掺杂纳米TiO_2的光催化活性。研究了Fe^(3+)掺杂浓度对表面吸附、微观结构和光催化性能的影响。实验结果表明,Fe^(3+)掺杂可以扩大TiO_2的光吸收范围,吸收阈值波长红移至443 nm。掺杂量0.25 at.%,光催化时间为2 h,初始甲醛浓度1.0 mg/m^3,反应器体积为4.8 dm^3,A4光催化纸样品对甲醛降解率为92.6%。论文也提出并讨论了金属Fe^(3+)离子在纳米TiO_2粒子表面螯合机理。

A series of Fe3 ＋ doped （ Fe3 ＋/TiO2 molar percent 0.0 - 1.0 at. % ） nano-TiO2 photocatalysts were pre- pared by in-situ composite method at room temperature and characterized by SEM, XPS and UV-Vis. The photocat- alytic activity of Fe3＋ -doped nano-TiO2 was evaluated by formaldehyde degradation test under visible light （40 W incandescent lamp with main light source 456 nm）. The effects of Fe3 ＋ doping concentration on surface adsorption, microstructure and photocatalytic properties were investigated. The photocatalytic time was 2h, the initial formalde- hyde concentration was 1.0 mg/m3 , the reactor volume was 4. 8 dm3, and the degradation rate of formaldehyde on A4 photocatalytic paper was 92.6 %. The chelating mechanism of metal Fe3 ＋ ions on the surface of nanosized-TiO2 particles was also proposed and discussed.