纳米四氧化三铁吸附水溶液中砷的研究(英文)

Adsorption of Arsenic from Aqueous Solution with Nano-Particles of Magnetite Black

采用水热法合成出纳米Fe3O4,借助X射线衍射、透射电子显微镜和比表面积分析等对其进行了表征。结果表明:所制备的样品为面心立方晶型的Fe3O4纳米薄片,比表面积为35.25 m2/g。用所制备的Fe3O4样品作为吸附剂去除水溶液中的五价砷,通过分光光度法计算出其去除率接近90%。通过单因素实验对所合成Fe3O4样品吸附去除溶液中五价砷的效果进行了考察,并建立了相应的吸附动力学方程,Fe3O4对五价砷的吸附效果随吸附时间和五价砷起始浓度的变化,分别符合Langmuir和Freundlich模型。

Magnetite black（Fe3O4） nano-particles were synthesized by a hydrothermal process,and characterized by X-ray powder diffraction（XRD）,transmission electron microscope（TEM） and Brunauer-Emmett-Teller method of specific surface area.The re-sults show that the as-synthesized particles with the specific surface area of 35.25 m2/g are face-centered cubic crystals with the mor-phology of nano-sheet.The synthesized Fe3O4 particles are used as an adsorbent to remove As（Ⅴ） in aqueous solution.The removal rate is approximately 90%.The adsorption effect of the Fe3O4 samples on arsenic（Ⅴ） in the solution is analysed.The correlated dy-namic equations are proposed.It is indicated that the adsorption effect varies with the adsorption time and the initial As（Ⅴ） concen-tration,which follows the Langmuir model and the Freundlich model,respectively.