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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0.227mmol/g和0.251mmol/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200mg/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。
Using mesoporous silicon material MCM-41 as matrix, three kinds of new adsorbents with mercapto group and amine group were designed and synthesized by grafting method. X-ray diffraction, Fourier transform infrared spectroscopy and N2 adsorption-desorption experiments were carried out to study the effect of material The effects of the modifier APTS and MPTMS on the structure were discussed. The adsorption experiments on the Co2 + material were carried out. The results showed that MA-MCM-2 prepared at a mass ratio of APTS to MPTMS of 1: 2 had a higher removal rate of Co2 + at a low concentration of 50%, which was better than the other two; MA-MCM-1 And the adsorption isotherms of MA-MCM-2 are well fitted with the Langmuir equation and the Freundlich equation, respectively. The saturated adsorption capacities are 0.227 mmol / g and 0.251 mmol / g respectively. The adsorption process follows the Lagergren quasi-second-order kinetic equation, The adsorption of Co2 + on MA-MCM-1 was affected by both liquid film diffusion and particle diffusion, while MA-MCM-2 and MA-MCM-3 were dominated by liquid film diffusion. When the content of Ca2 + and Mg2 + was 200mg / L, the removal efficiency of MA-MCM-2 to low concentration Co2 + still reached 38%, showing some interference ability.