It is of great importance to detect heavy metal ion in solution. Here, we describe the electrochemical detection of metal ions using polypyrrole/cellulose (PPCL) composite papers in both static and flow systems. A home-made electrochemical sensing device with a counter electrode and a reference electrode was fabricated to measure real-time sensor responses in flow systems. Simply, the conjugated polymer membranes had different chemical/physical properties by applying different potentials to them, which resulted in differentiable response patterns and adsorption efficiencies for individual metal ions. The sorption of metal ions by PPCL papers was examined in the flow system. The ability of the PPCL papers to recognize metal ions was examined in static and flow cells, in which real-time current change was monitored at five different applied potentials. Under different applied potentials, the conjugated polymer membrane gave rapid, selective, and quantitative responses to metal ions through principal component analysis. Particularly, the PPCL papers yielded unique signatures for three metal ions. Importantly, principal components analysis technique was employed to screen the unique response profile of the membranes to Hg(II), Ag(I), and Cr(III) ions from many response signals, even in a real sample, groundwater.
Journal: TechConnect Briefs
Volume: 1, Advanced Materials: TechConnect Briefs 2015
Published: June 14, 2015
Pages: 520 - 522
Industry sector: Advanced Materials & Manufacturing
Topics: Coatings, Surfaces & Membranes