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首页> 外文期刊>RSC Advances >Preparation and application of Ni(II) ion-imprinted silica gel polymer for selective separation of Ni(II) from aqueous solution
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Preparation and application of Ni(II) ion-imprinted silica gel polymer for selective separation of Ni(II) from aqueous solution

机译：Ni（II）离子印迹硅胶聚合物的制备及在水溶液中选择性分离Ni（II）的应用

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In the present study, a novel Ni(II) ion-imprinted sulfonate functionalized silica gel polymer was prepared with the surface imprinting technique by using nickel(II) as the template ion, grafted silica gel as the support, and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and ethylene glycol dimethacrylate (EGDMA) as the functional monomer and crosslinker, respectively. The sorbent was characterized by FT-IR, SEM, EDX, TG and BET. Kinetics studies indicated that the adsorption equilibrium was achieved within 12 min and the adsorption kinetics followed the pseudo-second-order rate equation. The adsorption isotherm was well fitted by the Langmuir model. The Ni(II) ion-imprinted silica gel polymer (Ni(II)-IIP) exhibited a higher adsorption capacity and selectivity for Ni(II) in comparison to the non-imprinted silica gel polymer (Ni(II)-NIP). The maximum adsorption capacities of Ni(II)-IIP and Ni(II)-NIP for Ni(II) were 20.30 and 4.87 mg g?1, respectively. The relative selectivity coefficients of the adsorbent for Ni(II) in the presence of Co(II), Cu(II), Zn(II) and Pb(II) were 4.09, 3.62, 5.78 and 5.86, respectively. Reusability studies indicated that the adsorption capacity of the prepared sorbent did not decrease significantly after repeated use six times. The precision of this method was verified and the prepared sorbent can be considered to be a promising sorbent for selective separation of Ni(II) from natural water samples.
机译：本研究以镍（ II ）为模板离子，采用表面压印技术制备了一种新型的Ni（ II ）离子印迹磺酸盐官能化硅胶聚合物。 ，接枝硅胶作为载体，2-丙烯酸酰胺基-2-甲基-1-丙磺酸（AMPS）和乙二醇二甲基丙烯酸酯（EGDMA）分别作为功能单体和交联剂。通过FT-IR，SEM，EDX，TG和BET对吸附剂进行表征。动力学研究表明，吸附平衡在12分钟内达到，吸附动力学遵循拟二级速率方程。 Langmuir模型很好地拟合了吸附等温线。 Ni（ II ）离子印迹硅胶聚合物（Ni（ II ）-IIP）表现出更高的吸附能力和对Ni（ II 的选择性与非压印硅胶聚合物（Ni（ II ）-NIP）相比。 Ni（ II ）-IIP和Ni（ II ）-NIP对Ni（ II ）的最大吸附容量为20.30和4.87 mg g ？1 。 Co（ II ），Cu（ II ），Zn（< small> II ）和Pb（ II ）分别为4.09、3.62、5.78和5.86。可重复使用性研究表明，重复使用六次后，制得的吸附剂的吸附能力并未明显降低。验证了该方法的精密度，所制备的吸附剂可以作为从天然水样中选择性分离Ni（ II ）的有前途的吸附剂。

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