Fe3O4@(SDS-HTlc)纳米复合物的制备及对甲基橙的吸附

采用离子交换法制备了具有核-壳结构的磁性十二烷基硫酸钠改性类水滑石Fe_3O_4@(SDSHTlc)纳米复合物,并利用透射电镜、粉末X-射线衍射、红外光谱、电感耦合等离子体发射光谱、元素分析等对其进行了表征。研究了Fe_3O_4@(SDS-HTlc)对甲基橙的吸附动力学和热力学。结果表明,Fe_3O_4@(SDSHTlc)对甲基橙有较好吸附效果,吸附动力学曲线符合准二级动力学方程;吸附等温线符合线性方程,吸附量随体系p H的增大和温度的升高均降低。在外部磁场下,30s内可从水溶液中分离出Fe_3O_4@(SDS-HTlc),这为去除水中疏水染料提供了简单的一步吸附处理方法。

Synthesis and Adsorption Property of Fe3O4@(SDS-HTlc) Nanocomposite for Methyl Orange

In this paper, magnetic hydrotalcite-like compound modified with sodium dodecylsulfate, Fe3O4@(SDS-HTlc) nanocomposite, was prepared by ion-exchange method. The samples were characterized by transmission electron microscope, powder X ray diffractometer, infrared spectrometer, inductively coupled plasma atomic emission spectrometry, elemental analyzer, contact angle measuring instrument, specific surface analyzer, electrophorese?instrument, and vibrating sample magnetometer. The adsorption property of Fe3O4@(SDS-HTlc) nanocomposite for methyl orange was studied by adsorption kinetics and thermodynamics. The experimental results showed that the adsorption kinetics conformed to the pseudo-second-order kinetic equation, and the adsorption isotherm agreed well with the linear equation. Fe3O4@(SDS-HTlc) had better adsorption capacity for methyl orange, and the adsorption amount decreased with increasing pH (and temperature). Fe3O4@(SDS-HTlc) nanocomposite can be easily separated from aqueous solution by the external magnetic field in 30 s, and may offer a simple single step adsorption treatment option to remove dye from water.