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首页> 外文期刊>RSC Advances >Synthesis, characterization and ion-exchange properties of novel hybrid polymer nanocomposites for selective and effective mercury(II) removal
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Synthesis, characterization and ion-exchange properties of novel hybrid polymer nanocomposites for selective and effective mercury(II) removal

机译：新型杂化聚合物纳米复合材料的合成，表征和离子交换性能，用于选择性和有效去除汞（II）

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摘要

The present work showed the synthesis of Ion Exchange Resin-Silver nanoparticles (IER-AgNPs) by impregnating ecofriendly synthesized AgNPs within a IER and its application as a novel polymer based hybrid nanocomposite for highly efficient removal of mercury (Hg2+) from aqueous solution. The nature of the synthesized IER-AgNPs was structurally and thermally characterized. When compared to resorcinol-formaldehyde resin (RFR) and IER, the synthesized nanocomposites revealed tremendous selectivity for Hg2+ removal from aqueous medium in the non-existence and existence of opposing ions Ca2+, Mg2+ and Na+ at much greater levels than the target poisonous metal. It was found that the potential Donnan membrane effect exerted by the immobilized negatively charged sulfonic acid groups bound to the macroporous cation exchanger of IER result in preconcentration and penetration enhancement of Hg2+ ions prior to their effective segregation by the impregnated AgNPs. Moreover, adsorption isotherms, kinetics, intraparticle diffusion and thermodynamics for the removal of Hg2+ were analyzed. Besides, breakthrough curves were found from column flow studies using the synthetic solution. 10% (w/w) HCl was used as an effective eluting agent for the regeneration of exhausted ion exchangers. Hence, IER-AgNPs cation-exchange resin could be efficiently used for the removal of mercury(II) ions from aqueous solution.
机译：目前的工作表明，通过将生态友好的合成AgNP浸渍在IER中，可以合成离子交换树脂-银纳米颗粒（IER-AgNPs），并将其用作新型聚合物基杂化纳米复合材料，以从水溶液中高效去除汞（Hg2 +）。合成的IER-AgNPs的性质在结构和热学上进行了表征。当与间苯二酚-甲醛树脂（RFR）和IER进行比较时，合成的纳米复合材料显示出在不存在且存在相对离子Ca2 +，Mg2 +和Na +的水平比目标有毒金属高得多的情况下，从水介质中去除Hg2 +的巨大选择性。已发现，结合在IER的大孔阳离子交换剂上的固定的带负电荷的磺酸基团可能会产生Donnan膜效应，从而导致Hg2 +离子在被浸渍的AgNP有效分离之前就进行了预浓缩和渗透增强。此外，分析了吸附等温线，动力学，粒子内扩散和热力学用于去除Hg2 +。此外，使用合成溶液通过柱流研究发现了突破曲线。 10％（w / w）的HCl被用作再生耗尽的离子交换剂的有效洗脱剂。因此，IER-AgNPs阳离子交换树脂可以有效地用于从水溶液中去除汞（II）离子。

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