State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Chemosphere. 2014 Mar;99:216-23. doi: 10.1016/j.chemosphere.2013.10.090. Epub 2013 Nov 28.
An ethylene-glycol (EG) mediated self-assembly process was firstly developed to synthesize micrometer-sized nanostructured Mg-doped Fe3O4 composite oxides to decompose hexachlorobenzene (HCB) at 300°C. The synthesized samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy and inductively coupled plasma optical emission spectrometer. The morphology and composition of the composite oxide precursor were regulated by the molar ratio of the magnesium acetate and ferric nitrate as the reactants. Calcination of the precursor particles, prepared with different molar ratio of the metal salts, under a reducing nitrogen atmosphere, generated three kinds of Mg doped Fe3O4 composite oxide micro/nano materials. Their reactivity toward HCB decomposition was likely influenced by the material morphology and content of Mg dopants. Ball-like MgFe2O4-Fe3O4 composite oxide micro/nano material showed superior HCB dechlorination efficiencies when compared with pure Fe3O4 micro/nano material, prepared under similar experimental conditions, thus highlighting the benefits of doping Mg into Fe3O4 matrices.
首先开发了一种乙二醇（EG）介导的自组装过程，用于合成微米级纳米结构的镁掺杂 Fe3O4 复合氧化物，以在 300°C 下分解六氯苯（HCB）。通过扫描电子显微镜、透射电子显微镜、X 射线衍射、能谱和电感耦合等离子体发射光谱对合成的样品进行了表征。通过改变镁醋酸盐和硝酸铁作为反应物的摩尔比来调节复合氧化物前体的形态和组成。在还原氮气氛下对不同金属盐摩尔比制备的前体颗粒进行煅烧，生成了三种镁掺杂 Fe3O4 复合氧化物微/纳米材料。它们对 HCB 分解的反应性可能受到材料形态和 Mg 掺杂剂含量的影响。与在相似实验条件下制备的纯 Fe3O4 微/纳米材料相比，球形 MgFe2O4-Fe3O4 复合氧化物微/纳米材料表现出更高的 HCB 脱氯效率，这突出了将 Mg 掺杂到 Fe3O4 基体中的益处。
