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首页> 外文期刊>RSC Advances >Facile preparation of a novel Hg(II)-ion-imprinted polymer based on magnetic hybrids for rapid and highly selective removal of Hg(II) from aqueous solutions
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Facile preparation of a novel Hg(II)-ion-imprinted polymer based on magnetic hybrids for rapid and highly selective removal of Hg(II) from aqueous solutions

机译：基于磁性杂化物的新型Hg（II）离子印迹聚合物的快速制备，可从水溶液中快速，高选择性地去除Hg（II）

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摘要

A novel magnetic ion-imprinted polymer (MIIP) with incorporated Fe3O4@SiO2 nanoparticles was synthesized via a surface imprinting technique using allylthiourea (ATU) as a functional monomer. The MIIP has an excellent saturation magnetization of 15.9403 emu g(-1). Solution pH values had an immediate influence on the Hg(II) adsorption capacity with optimal removal occurring at pH 6. The adsorptivity of MIIP towards Hg(II) ions (78.3 mg g(-1)) was approximately twice that of a magnetic nonion- imprinted polymer (39.5 mg g(-1)). The adsorption indicated that the adsorption mechanism closely agreed with a pseudo-second-order adsorption process, with a correlation coefficient (R-2) of 0.998, which could be attributed to the soft acid-soft base interaction of Hg(II) and allylthiourea. The relative selectivity coefficients of MIIP for Hg(II)/Ni(II), Hg(II)/Cu(II), Hg(II)/Co(II) and Hg(II)/Cd(II) were 623, 355, 623 and 155, respectively. The recovery in rebinding capacity for Hg(II) was found to be decreased by only approximately 10.4% up to the 6th cycle, which suggests an excellent stability of MIIP. The application of MIIP in real samples shows a removal rate for Hg(II) of more than 99% to well below U.S. EPA mercury limits for wastewater, indicating that the MIIP has wide application prospects for Hg(II) removal in environmental water samples.
机译：通过表面印迹技术，使用烯丙基硫脲（ATU）作为功能性单体，合成了掺入Fe3O4 @ SiO2纳米粒子的新型磁性离子印迹聚合物（MIIP）。 MIIP具有15.9403 emu g（-1）的出色饱和磁化强度。溶液的pH值对Hg（II）的吸附能力有直接影响，在pH 6时会发生最佳去除。MIIP对Hg（II）离子（78.3 mg g（-1））的吸附性约为磁性非离子的两倍-印迹聚合物（39.5 mg g（-1））。吸附表明其吸附机理与拟二级吸附过程密切相关，相关系数（R-2）为0.998，这可能归因于Hg（II）与烯丙基硫脲的软酸-软碱相互作用。 。 MIIP对Hg（II）/ Ni（II），Hg（II）/ Cu（II），Hg（II）/ Co（II）和Hg（II）/ Cd（II）的相对选择性系数为623、355分别为623和155。直到第6个循环，Hg（II）的结合能力的恢复仅降低了约10.4％，这表明MIIP具有出色的稳定性。 MIIP在实际样品中的应用表明Hg（II）的去除率超过99％，远低于美国EPA废水中的汞限值，这表明MIIP在环境水样品中去除Hg（II）的应用前景广阔。

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