中文摘要：

采用直接沉淀法制备了Fe掺杂ZnO/凹凸棒石（Fe-ZnO/ATP）复合材料,评价了其在可见光条件下（〉400 nm）光催化降解高浓度亚甲基蓝（MB）溶液的性能,并系统研究了ZnO负载量、Fe掺杂量和焙烧温度等对复合材料吸附性能和光催化性能的影响。结果表明,ATP的复合增强了复合材料对MB的吸附能力,MB在最佳条件下制备的Fe（0.3%）-ZnO（50%）/ATP复合材料上降解的表观反应速率常数（kapp）为4.2×10^-3min^-1,反应3.5 h后的降解率可达65.40%,与ZnO相比较,kapp和MB的降解率提高了2.6倍。XRD、TEM和UV-Vis-DRS的结果表明,复合材料中ATP的结构在热处理过程中基本保持不变,复合材料中Zn O的粒径明显减小,暴露了更多的活性位点。另外,Fe的掺杂可明显增强复合光催化剂对可见光的吸收,增强了对光的利用效率,从而使复合材料显示出优异的光催化活性。

英文摘要：

Fe doped ZnO/Attapulgite（Fe-ZnO/ATP） photocatalysts were prepared by direct precipitation method and the photocatalytic activities were investigated by degrading concentrated methylene blue（MB） solution under visible light irradiation（400 nm）.The effect of loading amount of ZnO,doping amount of Fe,and calcination temperature were investigated.The results showed that the presence of ATP can greatly enhance adsorption capability of Fe-ZnO/ATP towards MB and the Fe（0.3%）-ZnO（50%）/ATP prepared at optimal conditions showed enhanced activity for MB degradation with an apparent reaction rate constant（kapp） of 4.2×10^-3min^-1 and a degradation rate of 65.40% after 3.5 h of visible light irradiation,respectively,which are 2.6 times higher than that of pristine ZnO.XRD,TEM and UV-Vis-DRS analyses revealed that the crystalline structure of ATP in the composite was found thermally stable after calcination and the particle size of ZnO in composite is smaller than pristine ZnO with more exposed active sites.Moreover,Fe doping could improve the light response of the composite to maximize the utilization of incident light,which in turn enhances the photocatalytic performance of Fe-ZnO/ATP.