辅助水热法制备Fe/ZnO复合光催化剂及其性能的研究

Hydrothermal Preparation and Properties of Fe/ZnO Composite Photocatalyst

采用柠檬酸络合剂辅助水热法,制备了不同Fe掺杂浓度的(0%,1%,2%,3%和4%(摩尔分数))Zn O复合纳米光催化剂。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和紫外-可见漫反射光谱(DRS)等测试手段对纳米Fe/Zn O的晶体结构、微观形貌和光吸收性能等进行了表征,并以亚甲基蓝(MB)为模型污染物,在紫外光照下考察了纳米Fe/Zn O的光催化活性。经研究结果表明,该方法能成功地将Fe掺杂入Zn O晶体,并且当Fe的掺杂量大于1%时,Fe/Zn O样品对可见光区有明显的吸收。并且,Fe掺杂明显提高了Zn O的光催化效果,当Fe掺杂3%(摩尔分数)时,Zn O样品的光催化活性最高,在紫外光照射100 min后对MB的降解率可达到96.2%,较纯Zn O提高2.27倍。

Fe doped ZnO photocatalyst with various doping concentration（0%, 1%, 2%, and 3%） were prepared with hydrothermal method aided by citric acid. The phases and morphologies and optical absorption properties of Fe doped ZnO microstructures were characterized by X-ray diffraction （XRD）, scanning election microscope （SEM） and UV-Vis diffuse reflective spectrum （DRS）. The photocatalytic performances of Fe/ZnO photocatalyst with various doping concentration were studied using methylene blue as the stimulant pollutant. The measured results indicate that Fe can be successfully doped into ZnO crystals, and when the Fe doping amount is more than 1%, Fe/ZnO sample has obvious absorption to visible light area. Moreover, Fe doped ZnO microstructures can improve the performance of photocatalytic degradation. The optimal Fe content is 3 % （mole fraction）, and degradation rate for methylene blue after UV irradiation for 100 min can reach to 96.2 %, increases by 2.27 times compared with pure ZnO.