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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 
单位:海军工程大学船舶与动力学院 武汉 430033 
关键词:介孔材料 等温吸附 吸附动力学 动边界模型 干扰离子 
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。

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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.

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作者简介:
第一作者:姚青旭(1984—),男,博士研究生。
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参考文献:

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