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首页> 外文期刊>Journal of Polymers and the Environment >Magnetic Cr(VI) Ion Imprinted Polymer for the Fast Selective Adsorption of Cr(VI) from Aqueous Solution
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Magnetic Cr(VI) Ion Imprinted Polymer for the Fast Selective Adsorption of Cr(VI) from Aqueous Solution

机译：磁性Cr（VI）离子印迹聚合物可快速选择性吸附水溶液中的Cr（VI）

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摘要

In this study, a novel magnetic Cr(VI) ion imprinted polymer (Cr(VI)-MIIP) was successfully synthesized and used as a selective sorbent for the adsorption of Cr(VI) ions from aqueous solution. It can be synthesized through the combination of an imprinting polymer and magnetic nanoparticles. The high selectivity achieved using MIIP is due to the specific recognition cavities for Cr(VI) ions created in Cr(VI)-MIIP. Also, the magnetic properties that could be obtained using magnetic nanoparticles, helps to separate adsorbent with an external magnetic field without either additional centrifugation or filtration procedures. The magnetic Fe3O4 nanoparticles (MNPs) were synthesized using an improved co-precipitation method and modified with tetraethylorthosilicate (TEOS) before imprinting. The magnetic Cr(VI) ion imprinted polymer was prepared through precipitation copolymerization of 4-vinylpyridine as the complexing monomer, 2-hydroxyethyl methacrylate as a co-monomer, the Cr6+ anion as a template, and ethylene glycol dimethacrylate (EGDMA) as a cross-linker in the presence of modified magnetite nanoparticles. This novel synthesized sorbent was characterized using different techniques. Batch adsorption experiments were performed to evaluate the adsorption conditions, selectivity, and reusability. The results showed that the maximum adsorption capacity was 39.3 mg g(-1), which was observed at pH 3 and at 25 A degrees C. The equilibrium time was 20 min, and the amount of adsorbent which gave the maximum adsorption capacity was 1.7 g L-1. Isotherm studies showed that the adsorption equilibrium data were fitted well with the Langmuir adsorption isotherm model and the theoretical maximum adsorption capacity was 44.86 mg g(-1). The selectivity studies indicated that the synthesized sorbent had a high single selectivity sorption for the Cr(VI) ions in the presence of competing ions. Thermodynamic studies revealed that the adsorption process was exothermic ( < 0) and spontaneous ( < 0). In addition, the spent MIIP can be regenerated up to five cycles without a significant decrease in adsorption capacity.
机译：在这项研究中，成功​​地合成了一种新型的磁性Cr（VI）离子印迹聚合物（Cr（VI）-MIIP），并用作从水溶液中吸附Cr（VI）离子的选择性吸附剂。可以通过印迹聚合物和磁性纳米粒子的组合来合成。使用MIIP实现的高选择性是由于在Cr（VI）-MIIP中生成的Cr（VI）离子具有特定的识别腔。同样，使用磁性纳米颗粒可以获得的磁性，有助于在没有附加离心或过滤程序的情况下用外部磁场分离吸附剂。磁性Fe3O4纳米粒子（MNPs）使用改进的共沉淀法合成，并在压印前用原硅酸四乙酯（TEOS）改性。通过4-乙烯基吡啶作为络合单体，甲基丙烯酸2-羟乙酯作为共聚单体，Cr6 +阴离子作为模板和乙二醇二甲基丙烯酸酯（EGDMA）的沉淀共聚制备磁性Cr（VI）离子印迹聚合物。改性磁铁矿纳米粒子存在下的β-连接基。使用不同的技术对这种新颖的合成吸附剂进行了表征。进行批量吸附实验以评估吸附条件，选择性和可重复使用性。结果表明，最大吸附容量为39.3 mg g（-1），在pH 3和25 A摄氏度下观察到。平衡时间为20分钟，提供最大吸附容量的吸附剂的量为1.7。 g L-1。等温线研究表明，吸附平衡数据与Langmuir吸附等温线模型非常吻合，理论最大吸附容量为44.86 mg g（-1）。选择性研究表明，在存在竞争性离子的情况下，合成的吸附剂对Cr（VI）离子具有很高的单一选择性吸附。热力学研究表明，吸附过程是放热的（<0）和自发的（<0）。此外，用过的MIIP最多可以再生五个循环，而吸附能力不会显着降低。

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