【作者】 毛贵蕴； 孟琪； 卜凡兴； 蒋冬梅； 赵振杰； 胡鸣； 姜继森；

【Author】 Gui-Yun Mao;Qi Meng;Fan-Xing Bu;Dong-Mei Jiang;Zhen-Jie Zhao;Ming Hu;Ji-Sen Jiang;Department of Physics,Center for Functional Nanomateriels and Devices,East China Normal University;

【机构】 华东师范大学物理系,纳米功能材料与器件应用研究中心；

【摘要】 磁性纳米材料因其性质特殊,在生产、环境、生物、医学等领域都有着广泛的应用。通过将其与碳进行复合,不仅可以增加材料的稳定性,而且可以赋予材料许多新的性能。本论文通过在一定温度下氧化碳化Fe₃O₄/淀粉一步合成γ-Fe₂O₃/C纳米复合体。该γ-Fe₂O₃/C复合材料有较高的磁性且可以有效的把有机分子从其水溶液中吸附出来,因此对于污水中有机污染物的去除有很好的应用前景。通过批量实验获得亚甲基蓝（MB）在γ-Fe₂O₃/C纳米粒子表面吸附的动力学曲线及不同温度下的吸附等温线。吸附过程只需15min即可达到平衡,γ-Fe₂O₃/C纳米复合材料对MB的最大吸附量达到64.9 mg g-1。吸附动力学过程可以很好地用准-二级动力学模型来描述;Langmuir模型可以很好地拟合吸附等温线测量结果。合成的复合材料在水污染处理方面有良好的应用前景。更多还原

【Abstract】 Magnetic nanoparticles have been widely used in manufacture,environment,biology and medicine for their special characteristics.The modification of C can not only increase the stability of magnetic nanoparticles,but give the material many new functions.γ-Fe₂O₃/C nanocomposite was prepared through a convenient method by which one-pot synthesized Fe₃O₄/Starch was oxidized and carbonized by calcining at 250 ℃.The γ-Fe₂O₃/C displayed strong magnetism and could adsorb organic molecules from aqueous solution effectively,thus it showed promising application in the dislodgement of organic pollutants in sewage.Adsorption isotherms and kinetics of methylene blue（MB） onto γ-Fe₂O₃/C were studied in a batch system.The adsorption process reached equilibrium in about 15 min,and the maximum adsorption capacity of MB was found to be 64.9 mg g^-1 at 303 K.Adsorption isotherms were well fitted to Langmuir model and the adsorption kinetics could be described by the pseudo-second order kinetic equation.The findings of the present work highlight a new facile method to fabricate magnetic carbon-based composites and the obtained γ-Fe₂O₃/C with excellent magnetic property and adsorption performance hold great promise for practical application in water treatment.更多还原