A novel ion-imprinted polymer based on pyrrole as functional monomer for the voltammetric determination of Hg(II) in water samples

Nanomaterials-Based Ion-Imprinted Electrochemical Sensors for Heavy Metal Ions Detection: A Review

“…The template ions are first bonded to functional monomers in the form of covalent, semi-covalent or non-covalent binding, and then the combined units are chemically fixed by the polymerization of crosslinkers to enhance the stability and mechanical properties of the composite polymer loading templates [ 11 ]. After crosslinking polymerization, the template ions are removed by elution with acid and distilled water to obtain rigid polymers with specific arrangement groups, fixed hole size and shape, and three-dimensional holes with specific selectivity for target ions are formed [ 32 ]. The preparation principle was shown in Figure 1 .…”

“…Then, the imprinted graphite powder with the oil wax was mixed at a ratio of 7:3 (weight ratio), and the formed carbon paste was inserted into a cylindrical electrode holder glass (d = 3 mm) and contacted with a copper rod to obtain IIP-CPE. Rebolledo-Perales et al synthesized the Hg-IIP by using Py as the functional monomer, methanol as the porogen, EGDMA and sodium persulfate as the crosslinker and the initiator, respectively and constructed the modified electrode (CPE-IIP) by packing a composite mixture of 0.02 g of IIP, 0.18 g of graphite powder, and 0.08 g of paraffin oil into a plastic tube (0.50 mm in diameter and 25 mm in depth) situated at one end of the tube [ 32 ]. The obtained sensor presented a linear range of 0.09 to 20.05 mg/L with a LOD of 0.02 mg/L.…”