Molecularly imprinted electrospun nanofibers for adsorption of nickel-5,10,15,20-tetraphenylporphine (NTPP) in organic media
Molecularly imprinted electrospun nanofibers for adsorption of nickel-5,10,15,20-tetraphenylporphine (NTPP) in organic media
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DOI：
10.1007/s10965-013-0148-y
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发表时间：
2013-05
影响因子：
2.8
通讯作者：
K. Awokoya;B. Moronkola;S. Chigome;Dezzline A. Ondigo;Z. Tshentu;N. Torto
中科院分区：
文献类型：
--
作者：
K. Awokoya;B. Moronkola;S. Chigome;Dezzline A. Ondigo;Z. Tshentu;N. Torto
采用静电纺丝技术制备了一种分子印迹聚合物（MIP），并将其作为吸附剂用于有机介质中镍-5，10，15，20-四苯基卟啉（NTPP）的吸附。制备了三种不同的基于PET/PEI的分子印迹纳米纤维（MIN），以评估模板对NTPP识别亲和力的影响。ICP-OES分析表明，随着NTPP与苯乙烯的摩尔比从1：1增加到3：1，NTPP的吸附容量增加。产生最佳特异性亲和力和最高回收率（99.9%）的模板与功能单体的最佳比例为3：1。用MIN实现的NTPP的吸附程度远高于用非印迹聚合物（NIN）实现的吸附程度。当纤维质量为10、20和30 mg时，分别有40.4、60.2和99.9%的NTPP被MIN结合，而没有使活性位点过载。NIN的相应值分别为12、15和18%。此外，MIN在可重用性方面表现出显着的稳定性，因为它可以重复使用9次而不会损失任何性能。通过分析有证参比物质（CRM）NIST SRM 1634 c（残渣燃料油中的痕量金属）验证了方法的准确度，发现CRM中NTPP的浓度为17.64 mg/kg，在与17.54 mg/kg的认证值相关的误差范围内。因此，发现MIN是一种选择性吸附剂，非常适合于处理有机介质中的痕量金属。
An electrospun nanofiber containing a molecularly imprinted polymer (MIP) was fabricated by electrospinning and employed as a sorbent for the removal of nickel-5,10,15,20-tetraphenylporphine (NTPP) from organic media. Three different PET/PEI-based molecularly imprinted nanofibers (MIN) were prepared in order to evaluate the impact of the template on the affinity of recognition for NTPP. ICP-OES analysis showed that the NTPP adsorption capacity increased as the molar ratio of NTPP to styrene was increased from 1:1 to 3:1. The optimal ratio of template to functional monomer which yielded the best specific affinity and the highest recovery (99.9 %) was 3:1. The degree of adsorption of NTPP attained with the MIN was much higher than that achieved with the non-imprinted nanofiber (NIN). When the fiber masses were 10, 20, and 30 mg, 40.4, 60.2, and 99.9 %, respectively, of the NTPP was bound by the MIN without overloading the active sites. The corresponding values for the NIN were 12, 15, and 18 %, respectively. Furthermore, the MIN showed remarkable stability in relation to reusability, as it could be reused nine times without any loss in performance. The accuracy of the method was validated by analyzing the certified reference material (CRM) NIST SRM 1634c (Trace Metals in Residual Fuel Oil), and the concentration of NTPP in the CRM was found to be 17.64 mg/kg, which was within the error associated with the certified value of 17.54 mg/kg. The MIN was therefore found to be a selective sorbent that is well suited for handling trace metals in organic media.