title: Stripping voltammetric detection of mercury(II) based on a surface ion imprinting strategy in electropolymerized microporous poly(2-mercaptobenzothiazole) films modified glassy carbon electrode.
abstract: This work reports a surface ion imprinting strategy in electropolymerized microporous poly(2-mercaptobenzothiazole) (MPMBT) films at the surface of glassy carbon electrode (GCE) for the electrochemical detection of Hg(II). The Hg(II)-imprinted MPMBT/GCE exhibits larger binding to functionalized capacity, faster binding kinetics and higher selectivity to template Hg(II) due to their high ratio of surface-imprinted sites, larger surface-to-volume ratios, the complete removal of Hg(II) templates and larger affinity to Hg(II). The square wave anodic stripping voltammetry (SW ASV) response of the Hg(II)-imprinted MPMBT/GCE to Hg(II) is ca. 3.0 and 5.9 times larger than that at the direct imprinted poly(2-mercaptobenzothiazole) modified GCE and non-imprinted MPMBT/GCE sensor, respectively; and the detection limit for Hg(II) is 0.1nM (which is well below the guideline value given by the World Health Organization). Excellent wide linear range (1.0-160.0nM) and good repeatability (relative standard deviation of 2.5%) were obtained for Hg(II). The interference experiments showed that mercury signal was not interfered in the presence of Pb(II), Cd(II), Zn(II), Cu(II) and Ag(I), respectively. These values, particularly the high sensitivity and excellent selectivity compared favorably with previously reported methods in the area of electrochemical Hg(II) detection, demonstrate the feasibility of using the prepared Hg(II)-imprinted MPMBT/GCE for efficient determination of Hg(II) in aqueous environmental samples.
authors.affiliation: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China.
authors.forename: Xu-Cheng
authors.initials: XC
authors.lastname: Fu
authors.forename: Xing
authors.initials: X
authors.lastname: Chen
authors.forename: Zheng
authors.initials: Z
authors.lastname: Guo
authors.forename: Cheng-Gen
authors.initials: CG
authors.lastname: Xie
authors.forename: Ling-Tao
authors.initials: LT
authors.lastname: Kong
authors.forename: Jin-Huai
authors.initials: JH
authors.lastname: Liu
authors.forename: Xing-Jiu
authors.initials: XJ
authors.lastname: Huang
mesh_terms: D052160:Benzothiazoles / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D008628:Mercury / Q000032:analysis*; D054802:Molecular Imprinting; D058105:Polymerization; D011108:Polymers / Q000737:chemistry; D016062:Porosity; D012680:Sensitivity and Specificity; D013499:Surface Properties; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D052160:Benzothiazoles; D011108:Polymers; D014874:Water Pollutants, Chemical; D014867:Water; C005563:captax; D002244:Carbon; D008628:Mercury