Novel Hg²⁺-imprinted polymers based on thymine-Hg²⁺-thymine interaction for highly selective preconcentration of Hg²⁺ in water samples

详细信息    查看全文

• 作者：Shoufang Xu ; Lingxin Chen ; Jinhua Li ; Yafeng Guan ; Hongzhi Lu
• 关键词：Ionic imprinted polymers ; Mercury ion ; T&ndash ; Hg&ndash ; T ; Solid-phase extraction
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 出版时间：30 October, 2012
• 年：2012
• 卷：237-238
• 期：Complete
• 页码：347-354
• 全文大小：740 K

文摘

A novel functional monomer T-IPTS, 3-isocyanatopropyltriethoxysilane (IPTS) bearing thymine (T) bases, was synthesized for imprinting Hg²⁺. Then a novel Hg²⁺ ionic imprinted polymers (IIPs) based on thymine-Hg²⁺-thymine (T-Hg²⁺-T) interactions, i.e. Hg-IIPs-T, were prepared by sol-gel process for the first time in this work. The Hg-IIPs-T exhibited excellent selectivity towards Hg²⁺ over Cd²⁺, Zn²⁺ Pb²⁺, Co²⁺, Mn²⁺, Mg²⁺ and Ca²⁺, due to the specific T-Hg²⁺-T interactions with high selectivity and high affinity. Accordingly, Hg-IIPs-T were used as solid-phase extraction (SPE) sorbents for preconcentration of trace Hg²⁺ in water samples, and satisfactory recoveries ranging from 95.2 to 116.3 % were obtained. Also, under optimized conditions, preconcentration factor and detection limit were achieved of 200 and 0.03 ¦Ìg L^?1, respectively. The IIPs-T-SPE proved to be a rapid and high-effective cleanup and enrichment method for trace Hg²⁺ in water samples. More importantly, these results indicated that devising and synthesizing new functional monomers tailor-made for template would become a general promising way to improve the selectivity and stability of IIPs.