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首页> 外文期刊>RSC Advances >Rapid and selective separation of molybdenum ions using a novel magnetic Mo(VI) ion imprinted polymer: a study of the adsorption properties
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Rapid and selective separation of molybdenum ions using a novel magnetic Mo(VI) ion imprinted polymer: a study of the adsorption properties

机译：使用新型磁性Mo（VI）离子印迹聚合物快速选择性地分离钼离子：吸附性能的研究

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In this work, we have developed a convenient method for the rapid and selective separation of Mo(VI) from aqueous solution by using a novel magnetic Mo(VI) ion imprinted polymer (Mo(VI)-MIIP) as the sorbent. This sorbent was synthesized using methacrylic acid (MAA) as the functional monomer, the Mo6+ anion as a template, ethylene glycol dimethacrylate (EGDMA) as a cross-linker, and Fe3O4@SiO2 as the magnetic component. The template Mo6+ ions were removed from the polymer using a solution containing 10% (v/v) methanol in HCl (0.5 mol L-1). The thermal stability, chemical structure, and magnetic properties of the synthesized sorbent were characterized using different techniques. Various parameters which affect the adsorption efficiency were evaluated in a batch system to determine the optimal adsorption conditions and reduce non-specific interactions. The results showed that the maximum adsorption capacity was 28 mg g(-1), which was observed at 25 degrees C. The equilibrium time for the adsorption of the Mo(VI) analyte was determined over 30 min, and the amount of adsorbent which gave the maximum adsorption capacity was 1 g L-1. The kinetic data, obtained under optimum conditions, could be fitted with a pseudo-second order kinetic model with a high correlation coefficient (R-2 - 0.9971). The adsorption isotherm data could be well described using Langmuir adsorption isotherms, and the maximum adsorption capacity calculated from the Langmuir isotherm was 31.08 mg g(-1). This was very close to the maximum adsorption capacity obtained under optimal conditions. The selectivity studies indicated that the synthesized sorbent had a high single selectivity sorption for the Mo6+ anion in the presence of competing ions. The values of the thermodynamic parameters proved that the adsorption process of molybdenum onto the synthesized sorbent was exothermic (Delta H < 0) and spontaneous (Delta G < 0). In addition, the spent MIIP can be reused several times without a significant decrease in adsorption capacity.
机译：在这项工作中，我们已经开发了一种方便的方法，可以通过使用新型的磁性Mo（VI）离子印迹聚合物（Mo（VI）-MIIP）作为吸附剂，从水溶液中快速选择性地分离Mo（VI）。该吸附剂是使用甲基丙烯酸（MAA）作为功能单体，Mo6 +阴离子作为模板，乙二醇二甲基丙烯酸酯（EGDMA）作为交联剂以及Fe3O4 @ SiO2作为磁性成分合成的。使用含10％（v / v）甲醇的HCl（0.5 mol L-1）溶液从聚合物中除去模板Mo6 +离子。使用不同的技术表征了合成吸附剂的热稳定性，化学结构和磁性。在间歇系统中评估了影响吸附效率的各种参数，以确定最佳的吸附条件并减少了非特异性相互作用。结果表明，最大吸附容量为28 mg g（-1），在25摄氏度时观察到。在30分钟内确定了Mo（VI）分析物的吸附平衡时间，并确定了吸附剂的量。最大吸附容量为1 g L-1。在最佳条件下获得的动力学数据可以与具有高相关系数（R-2-0.9971）的伪二级动力学模型拟合。吸附等温线数据可以使用Langmuir吸附等温线很好地描述，根据Langmuir等温线计算的最大吸附容量为31.08 mg g（-1）。这非常接近在最佳条件下获得的最大吸附容量。选择性研究表明，在存在竞争离子的情况下，合成的吸附剂对Mo6 +阴离子具有较高的单选择性吸附。热力学参数的值表明，钼在合成吸附剂上的吸附过程是放热的（Delta H <0）和自发的（Delta G <0）。此外，用过的MIIP可以重复使用几次，而不会显着降低吸附能力。

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