title: Dummy molecularly imprinted polymers on silica particles for selective solid-phase extraction of tetrabromobisphenol A from water samples.
abstract: Surface molecular imprinted polymers (MIPs) on silica gel particles for highly selective recognition of tetrabromobisphenol A (TBBPA) were prepared by a sol-gel process. Diphenolic Acid (DPA) and bisphenol A (BPA), whose structures were similar to that of TBBPA were selected as dummy template molecules, and 3-aminopropyltriethoxysilane (APTES) and tetramethoxysilane (TEOS) were chosen as functional monomer and cross-linker, respectively. The obtained materials were characterized by FT-IR with diffuse reflectance accessory and the results indicated polymers were successfully grafted on the surface of silica gel supporters. The maximum static adsorption capacities for TBBPA of the DPA-MIPs, BPA-MIPs and non-imprinted polymers (NIPs) were 45, 38 and 22 mg g(-1) respectively, and the results of dynamic adsorption showed that the adsorption equilibrium can be achieved within 15 min for DPA- and BPA-MIPs. Both the DPA- and BPA-MIPs have higher selectivity for TBBPA than that of NIP when they are used as the sorbents for the solid phase extraction (SPE), while the adsorption property of DPA-MIPs was superior to that of BPA-MIPs at low concentration levels of TBBPA. The results indicated DPA-MIPs had more high affinity binding sites for TBBPA, which demonstrated that the strong interactions between the template and the functional monomer were favorable to form high affinity binding sites and improve the selectivity of the polymers. A corresponding analytical method for determination of the TBBPA residues in environmental samples was developed. The recoveries of TBBPA in tap water, river water and lake water were in the range from 85% to 97% with relative standard deviations below 7%, and its limit of detection can reach 2 ng mL(-1).
authors.affiliation: Analytical & Testing Center of Beijing Normal University, Beijing Key Laboratory, Beijing 100875, China.
authors.forename: Yu-Min
authors.initials: YM
authors.lastname: Yin
authors.forename: Yi-Ping
authors.initials: YP
authors.lastname: Chen
authors.forename: Xiang-Feng
authors.initials: XF
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Hai-Ling
authors.initials: HL
authors.lastname: Liu
authors.forename: Meng-Xia
authors.initials: MX
authors.lastname: Xie
mesh_terms: D000327:Adsorption; D002853:Chromatography, Liquid; D005618:Fresh Water / Q000737:chemistry; D054802:Molecular Imprinting / Q000379:methods*; D010636:Phenols / Q000737:chemistry; D011075:Polybrominated Biphenyls / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D010636:Phenols; D011075:Polybrominated Biphenyls; D014874:Water Pollutants, Chemical; D014867:Water; D012822:Silicon Dioxide; C020806:tetrabromobisphenol A