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以天然的钙基蒙脱石为基质,在超声波处理的条件下制备了新型的十二烷基硫酸钠(SDS)-铁复合柱撑蒙脱石,并采用X射线粉末衍射(XRD)、红外光谱(FT-IR)和热重(TGA)对其进行表征。研究了镉在复合柱撑蒙脱石上的吸附特性,从动力学角度探讨了吸附机理。结果表明,吸附过程符合准二级动力学方程,化学吸附控制了吸附过程的速度,且平衡吸附量qe与平衡浓度eρ之间的关系符合Langmuir等温方程。
A novel sodium dodecyl sulfate (SDS) -iron composite pillared montmorillonite was prepared from natural calcium-based montmorillonite under ultrasonic treatment and characterized by X-ray powder diffraction (XRD), infrared It was characterized by FT-IR and TGA. The adsorption characteristics of cadmium on the composite pillared montmorillonite were studied, and the adsorption mechanism was discussed from the kinetic point of view. The results show that the adsorption process accords with the quasi-second-order kinetic equation and chemisorption controls the speed of the adsorption process. The relationship between equilibrium adsorption quantity qe and equilibrium concentration eρ conforms to the Langmuir isothermal equation.