title: Novel Hg2+-imprinted polymers based on thymine-Hg2+-thymine interaction for highly selective preconcentration of Hg2+ in water samples.
abstract: A novel functional monomer T-IPTS, 3-isocyanatopropyltriethoxysilane (IPTS) bearing thymine (T) bases, was synthesized for imprinting Hg(2+). Then a novel Hg(2+) ionic imprinted polymers (IIPs) based on thymine-Hg(2+)-thymine (T-Hg(2+)-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 Hg(2+) over Cd(2+), Zn(2+) Pb(2+), Co(2+), Mn(2+), Mg(2+) and Ca(2+), due to the specific T-Hg(2+)-T interactions with high selectivity and high affinity. Accordingly, Hg-IIPs-T were used as solid-phase extraction (SPE) sorbents for preconcentration of trace Hg(2+) 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 μg L(-1), respectively. The IIPs-T-SPE proved to be a rapid and high-effective cleanup and enrichment method for trace Hg(2+) 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.
authors.affiliation: Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
authors.forename: Shoufang
authors.initials: S
authors.lastname: Xu
authors.forename: Lingxin
authors.initials: L
authors.lastname: Chen
authors.forename: Jinhua
authors.initials: J
authors.lastname: Li
authors.forename: Yafeng
authors.initials: Y
authors.lastname: Guan
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Lu
mesh_terms: D000327:Adsorption; D008628:Mercury / Q000737:chemistry*; D054802:Molecular Imprinting; D011108:Polymers / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*; D052616:Solid Phase Extraction; D013941:Thymine / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: C492426:(3-isocyanatopropyl) triethoxysilane; D011108:Polymers; D012821:Silanes; D014874:Water Pollutants, Chemical; D008628:Mercury; D013941:Thymine