采用液相沉积法,在室温条件下制备了不同Mn掺杂浓度(0,0．25％,0．5％和1．0％(摩尔分数))的花状ZnO 微结构.利用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对制备的花状ZnO 微结构的物相及形貌进行表征.以甲基橙溶液作为光催化反应模型污染物,对不同浓度的 Mn 掺杂花状ZnO 微结构的光催化性能进行了研究.实验结果表明,Mn在ZnO 材料中以两种形态存在,即进入晶格以Mn2＋形式替代 Zn2＋和以 Mn3 O4形式附着在ZnO 材料表面.且 Mn 掺杂提高了花状 ZnO 微球结构的光催化活性,当掺杂浓度为0．25％(摩尔分数)时光催化性能最优,紫外光照2．0 h 后,对甲基橙的光催化降解率可达88．7％.
In this paper,Mn-doped flower-like ZnO microstructures with various doping concentration (0,0.25, 0.5 and 1.0mol %)were fabricated using liquid phase deposition at room temperature.The phases and morphol-ogies of Mn-doped flower-like ZnO microstructures were characterized by XRD,SEM and TEM.The photocata-lytic performances of Mn-doped flower-like ZnO microstructures with various doping concentration were studied using methyl orange as the stimulant pollutant.The measured results indicated that Zn2+ maybe replaced by Mn2+ in the lattice of ZnO or exist on the surface of ZnO nanoplates as Mn3 O4 .Moreover,the experimental re-sults prove that Mn-doped ZnO microstructures can improve the performance of photocatalytic degradation.The optimization of Mn content is 0.25mol%,and degradation rate for methyl orange can reach to 88.7%.
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