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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(k_(app))为4.2×10~(-3)min~(-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。
Fe-doped ZnO / attapulgite (Fe-ZnO / ATP) composites were prepared by direct precipitation method and their photocatalytic degradation properties under high visible light (> 400 nm) were evaluated. The effects of ZnO loading, Fe doping amount and calcination temperature on the adsorption and photocatalytic properties of the composites were systematically investigated. The results showed that the complexation of ATP enhanced the MB adsorption capacity and the apparent rate constant (k_ (subscript i)) of degradation of MB prepared under the optimal conditions for Fe (0.3%) - ZnO apples) was 4.2 × 10 ~ (-3) min ~ (-1), the degradation rate was 65.40% after 3.5 h reaction, and the degradation rate of kapp and MB increased by 2.6 times compared with ZnO. The results of XRD, TEM and UV-Vis-DRS showed that the structure of ATP in the composite material remained basically unchanged during the heat treatment, and the particle size of ZnO in the composite material was significantly reduced, exposing more active sites. In addition, the doping of Fe can significantly enhance the absorption of visible light by the composite photocatalyst and enhance the utilization efficiency of light, so that the composite material shows excellent photocatalytic activity.