title: An overwhelmingly selective colorimetric sensor for Ag(+) using a simple modified polyacrylonitrile fiber.
abstract: A carboxymethyl-dithiocarbamate immobilized polyacrylonitrile fiber colorimetric sensor has been synthesized. This fiber sensor exhibits excellent selectivity and sensitivity for Ag(+) in aqueous solution with a remarkable color change from light pink to red-brown over a wide pH range of 2-12. The sensor responds selectively to Ag(+) in the presence of other ions, including Mg(2+), Al(3+), Ca(2+), Cr(3+), Mn(2+), Co(2+), Ni(2+), Cu(2+), Zn(2+), Cd(2+), Hg(2+) and Pb(2+). The colorimetric sensor has an extremely fast response time (10s) and a low visual limit of detection (5.53×10(-12) mol/L). The fiber sensor also undergoes an obvious color change in the presence of Ag(+) solutions containing EDTA, NaCl or NaBr. Density functional theory optimization reveals that the sensor and Ag(+) interact via a seven-membered ring complexation mechanism.
authors.affiliation: Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Xing
authors.affiliation: Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Huixiao
authors.initials: H
authors.lastname: Yang
authors.affiliation: Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China. Electronic address: mltao@tju.edu.cn.
authors.forename: Minli
authors.initials: M
authors.lastname: Tao
authors.affiliation: Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Wenqin
authors.initials: W
authors.lastname: Zhang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry; D002219:Carbamates / Q000737:chemistry; D003124:Colorimetry / Q000295:instrumentation* / Q000379:methods*; D004492:Edetic Acid / Q000737:chemistry; D005374:Filtration; D006863:Hydrogen-Ion Concentration; D007477:Ions; D057230:Limit of Detection; D053768:Metal Nanoparticles; D008855:Microscopy, Electron, Scanning; D011312:Pressure; D012834:Silver / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D017670:Sodium Compounds / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000180:Acrylic Resins; D001965:Bromides; D002219:Carbamates; D007477:Ions; D017670:Sodium Compounds; C010504:polyacrylonitrile; D012834:Silver; D012965:Sodium Chloride; D004492:Edetic Acid; C027938:sodium bromide
keywords: Carboxymethyl; Colorimetric senor; Polyacrylonitrile fiber; Selectivity; Silver ion; dithiocarbamate