中文摘要：

采用改进的共沉淀法与溶剂热法相结合制备了ZnFe2O4纳米晶，利用X射线衍射（XRD）、透射电镜（TEM）对ZnFe2O4的晶型和形貌进行了表征，讨论了其表面的光伏效应．以酸性橙Ⅱ的光催化脱色性能作为探针反应，详细地考察了催化剂的用量、底物浓度及溶液pH等因素对其脱色效果的影响。结果表明，制备的ZnFe2O4为正尖晶石型结构。平均粒径为7nm左右，样品具有一定的捕获电子能力，在外加电场下光伏响应变化明显，在正电场下有最佳响应值。而当负电场达到一定值时，外电场的光伏响应占据主导地位。在酸性橙Ⅱ为20mg／L、催化剂用量为1．0g／L的中性条件下，其脱色效率达95％左右，而且经过4次重复使用后催化剂仍然具有一定的脱色性能。

英文摘要：

A nanocrystalline ZnFe2O4 catalyst was prepared by co-precipitatlon and hydrothermal crystallization; its structure and shape were characterized by XRD and TEM. Effects of catalyst dose, initial concentration and pH on photo catalytic decolorization of Acid Orange Ⅱ （AO） were determined. The spherical catalyst particle （about 7 nm in diameter） was pure crystal of spinel structure; it was capable of capturing electrons. Under the external electrical field, the catalyst exhibited a notable photovoltaic response; the response had an optimal value in a positive electric field, while it would prevail in a specific negative electric field. The catalyst （1.0 g/L） accomplished 〉95% color reduction of an AO solution （20 mg/L, neutral pH） ; its catalytic activity declined only slightly after four treatment recycles.