硅酸盐学报

一种硅基介孔材料的制备及其对低浓度Co2+的选择性吸附

作者：姚青旭贾铭椿门金凤

分类号：TQ170.9

出版年,卷(期):页码：2012,40(10):1530-1530

DOI：

摘要：

摘要：以介孔硅材料MCM-41为基体，采用接枝法设计合成了三类含巯基和胺基的新型吸附材料，通过X射线衍射、Fourier变换红外光谱及N2吸附–脱附实验，对材料的结构进行了表征，探讨了改性剂APTS与MPTMS配比对结构的影响，并对材料Co2+的吸附性能进行了静态吸附实验。结果表明：APTS与MPTMS的质量比为1:2时制备的吸附材料MA-MCM-2对低浓度Co2+具有较高的去除率，达到50%以上，好于其他两种；MA-MCM-1和MA-MCM-2等温吸附结果与Langmuir方程及Freundlich方程均能较好地拟合，其饱和吸附容量分别为0.227 mmol/g和0.251 mmol/g；吸附过程遵循Lagergren准二级动力学方程，Co2+在MA-MCM-1的吸附过程受液膜扩散和颗粒扩散共同作用，而MA-MCM-2和MA-MCM-3受液膜扩散作用主导。在干扰离子Ca2+和Mg2+含量达到200 mg/L时，MA-MCM-2对低浓度Co2+的去除效率仍达到38%，表现出了一定的干扰能力。

Abstract: Three adsorbent materials were prepared via the simultaneous graft of thiol and amine on MCM-41 . Their structures with different molar ratios of APTS to MPTMS in modifying agents were analyzed by X-ray diffraction, Fourier transform infrared spectroscopy and N2 adsorption-desorption isotherms technique as well. The batch adsorption experiments were carried out. The results indicate that the sample of MA-MCM-2 exhibits a maximum adsorption amount to Co2+ in dilute solutions with the removal efficiency of 50%. The adsorption isotherm behavior of MA-MCM-1 and MA-MCM-2 followed both the Langmuir and Freundlich equations, and the maximum adsorption capacities were 0.227 mmol/g and 0.251 mmol/g, respectively. The adsorption kinetics followed the Lagergren pseudo-second-order rate model. The adsorption of Co2+ for MA-MCM-1 was due to the liquid film diffusion and the intra-particle diffusion, and the adsorption of Co2+ for MA-MCM-2 and MA-MCM-3 was only due to the liquid film diffusion. All the adsorbents showed a decreased adsorption ability to Co2+ in the presence of Ca2+ and Mg2+. However, MA-MCM-2 removed Co2+ at the removal efficiency of 38% in dilute solution even when the interfering metal ions concentration was up to 200 mg/L. Therefore, the MA-MCM-2 could be used for the selective adsorption for Co2+ in dilute solutions.

基金项目：

作者简介：

第一作者：姚青旭(1984—)，男，博士研究生。

参考文献：

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