An overwhelmingly selective colorimetric sensor for Ag+ using a simple modified polyacrylonitrile fiber

作者：Xing Xiaoli; Yang Huixiao; Tao Minli; Zhang Wenqin

来源：Journal of Hazardous Materials, 2015, 297: 207-216.

DOI：10.1016/j.jhazmat.2015.05.001

• Carboxymethyl
• dithiocarbamate
• Polyacrylonitrile fiber
• Colorimetric senor
• Silver ion
• Selectivity

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 Mg2+, Al3+, Ca2+, Cr3+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and Pb2+. The colorimetric sensor has an extremely fast response time (10s) and a low visual limit of detection (5.53 x 10(-12) mol/L). The fiber sensor also undergoes an obvious color change in the presence of Ag+ solutions containing EDTA, NaCI or NaBr. Density functional theory optimization reveals that the sensor and Ag+ interact via a seven-membered ring complexation mechanism.

• 出版日期2015-10-30
• 单位天津大学