液相沉积法制备光催化活性掺铁TiO_2薄膜

Photocatalytic Activity of Fe^(3+)-Doped TiO_2 Thin Films Prepared via Liquid-Phase Deposition

通过在氟钛酸铵 氟铁酸混合溶液中加入硼酸溶液 ,应用液相沉积法制备了具有高光催化活性的掺铁TiO2 薄膜 .用ICP AES测定了掺铁TiO2 薄膜中Fe3 + 的浓度 ,用XRD ,AFM ,UV Vis和阶梯仪等对TiO2 薄膜的沉积条件、结构、膜厚和性能进行了表征 ,并以亚甲蓝降解反应评价了掺铁TiO2 薄膜的光催化活性 .结果表明 ,在硼酸 /六氟钛酸铵摩尔比为 2～ 4时 ,掺铁TiO2 薄膜中含有锐钛矿相TiO2 .当掺Fe3 + 浓度为 0 0 5 % ,热处理温度为 30 0℃时 ,掺铁TiO2 薄膜具有最高的光催化活性 ,其光催化活性是未经热处理时的 3 9倍 ,是经 30 0℃热处理但未掺铁TiO2 薄膜的 1 4倍 .

Fe 3+ doped TiO 2 thin films with high photocatalytic activity were prepared via liquid phase deposition method by adding H 3BO 3 solution into (NH 4) 2TiF 6 HFeF 4 mixture solution supersaturated with anatase nano crystalline TiO 2 at 35 ℃. The Fe 3+ concentration in the deposited thin films was measured by ICP AES. The effects of the deposition conditions on the structure, the surface morphology, the thickness and the performance of Fe 3+ doped TiO 2 thin films were studied by XRD, AFM, UV Vis and step profilometer. The photocatalytic activity of Fe 3+ doped TiO 2 thin films was evaluated by degradation of methylene blue. The results indicated that, when n (H 3BO 3) / n (TiF 2- 6) =2～4, the anatase TiO 2 existed in the deposited thin films. In the degradation of methylene blue, the catalytic activity of Fe 3+ doped TiO 2 thin films with w (Fe 3+ ) =0 05% calcined at 300 ℃ reached a maximum, being 3 9 and 1 4 times as high as that as deposited at 35 ℃ and that without Fe 3+ calcined at 300 ℃, respectively.