水热法制备Fe掺杂Ag/ZnO复合纳米材料及其光催化性能研究

以Zn(CH3COO)2·2H2O、AgNO3、Fe(NO3)3·9H2O为原料,NaOH为沉淀剂,H2O为溶剂,C2H5OH为还原剂,柠檬酸为表面活性剂,采用水热法制备出Fe掺杂Ag/ZnO复合纳米材料。采用XRD、SEM、TEM、SAED等测试手段对制备产物的物相结构、微观形貌等进行表征,以甲基橙为目标降解物研究了制备产物的光催化性能。结果表明,Ag以单质的形式存在于ZnO表面,Fe掺杂到ZnO晶格中。Fe掺杂Ag/ZnO复合纳米材料在模拟日光下具有较高的光催化性能,在800W氙灯照射下降解甲基橙150min,甲基橙的降解率可达到99.4%,较Ag/ZnO提高了7.8%,较ZnO提高了38.2%。

Fe掺杂的Ag-ZnO纳米复合材料的合成及光催化性能

采用高分子网络凝胶工艺制备了Fe掺杂的Ag-ZnO系列纳米粉体。通过XRD、SEM、XPS、PL和UV-vis对所制备样品的微结构和光学性质进行了表征,随后以甲基橙和亚甲基蓝为模拟污染物,分别在模拟紫外光和模拟太阳光下对所制备的样品进行光催化测试。结果表明,Fe掺杂后,ZnO晶粒尺寸有所减小,且纳米Ag颗粒的分散性得到改善。样品中的Fe以Fe^(2+)和Fe^(3+)形式共存,随着Fe掺杂浓度的增加,ZnO晶格中的铁离子由+2价向+3价转变,导致PL光谱中蓝光发射峰强度降低。光催化测试结果表明样品Zn_(0.96)Fe_(0.01)Ag_(0.03)O具有最好的光催化活性,结合样品的微结构和光学性质对其光催化机理进行了讨论。

Enhancing the Antibacterial Efficiency of ZnO Nanopowders Synthesized by Combustion Method Through Ag+Fe Co-doping

（Ag ＋ Fe）-doped ZnO nanopowders have been synthesized using combustion method. Ag doping level was kept as 2 at.%, and Fe doping level was varied from 3 to 6 at,%, and the structural, optical, surface morphological, and antibacterial properties have been investigated. The structural studies show that ZnO/（Ag 4-Fe） nanopowders have hexagonal wurtzite structure with a preferential orientation along the （101） plane. The FE-SEM images indicate that there is a gradual decrease in the grain size with the increase in the doping level of Fe, and the TEM images are correlated well with FE-SEM images. The XPS profile clearly confirms the presence of expected elemental composition. Photolumi- nescence studies reveal the presence of extrinsic defects in the material. Antibacterial activity of Ag- and Fe-doped ZnO nanopowders against Vibrio parahaemolyticus, Vibrio Cholerae, and Staphylococcus aureus bacteria was also investigated.