阴极共电沉积制备ZnO/α-FeOOH复合膜及其光催化活性(英文)

CATHODIC CO-ELECTRODEPOSITION OF ZnO/α-FeOOH COMPOSITE FILMS AND THEIR PHOTOCATALYTIC PERFORMANCE

利用阴极共电沉积法,在铟锡氧化物涂层玻璃基体上成功制备了ZnO/α-FeOOH复合膜。用X射线衍射和X射线能量散射谱分别对其晶相和化学组成进行了表征,以Cr(VI)的光催化还原作为探针反应评价了其光催化活性。结果表明:与单一的ZnO膜相比,不论是在紫外光还是紫外-可见光照射下,ZnO/α-FeOOH复合膜均呈现出更高的光催化活性。紫外光照射下,ZnO/α-FeOOH复合膜催化活性的提高主要应归因于异质结界面上光生电荷的有效分离,而掺杂到ZnO中的Fe(III)的电子捕获效应在紫外-可见光条件下也发挥着重要作用。

ZnO/α-FeOOH composite films were prepared on indium tin oxide（ITO）-coated glass substrates via a cathodic co-electro-deposition route.The films were characterized with X-ray diffraction and energy dispersive X-ray spectroscopy.Photocatalytic reduction of hexavalent chromium（Cr（VI）） was used as a probe reaction to evaluate their photocatalytic activity.ZnO/α-FeOOH composite films show higher photocatalytic activity than that of pure ZnO films under both ultraviolet（UV） and UV-Visible（Vis） light illumination.The improvement in photocatalytic activity for ZnO/α-FeOOH composite films under UV light illumination should be mainly attributed to the efficient interfacial charge separation,while the electrons trap effect of Fe（Ⅲ） doped into ZnO films also plays an important role under UV-Vis light illumination.