Comparative study of electrostatic binding vs. complexation of Cu²⁺ ions with water‐soluble polymers containing styrene sulphonic acid and/or maleic acid units or their sodium salt forms

Abstract

The interaction of Cu2+ ions with the homopolymer poly(styrene sulfonic acid) (PSSH), as well as with the copolymers of maleic acid (MAc) with styrene sulfonic acid (SSH) or vinyl acetate (VAc), was investigated in dilute aqueous solution through turbidimetry, potentiometry, viscometry, and spectrophotometry in the visible region. Cu2+ ions were introduced either through neutralization with Cu(OH)2 of the acid form of the (co)polymers (PSSH, P(SSH‐co‐MAc) and P(VAc‐co‐MAc)) or through mixing of the sodium salt form of the (co)polymers (PSSNa, P(SSNa‐co‐MANa) and P(VAc‐co‐MANa)) with CuSO4. Turbidimetry, potentiometry, and spectrophotometry revealed that the first carboxylic group of MAc or both carboxylate groups of MANa are involved in the complexation with Cu2+ ions when neutralization with Cu(OH)2 or mixing with CuSO4 are applied, respectively. The increased values of the reduced viscosity observed mainly at the first stages of neutralization of P(VAc‐co‐MAc) with Cu(OH)2 indicate that interchain polymer‐Cu2+ complexation takes possibly place. Finally, the spectrophotometric behavior observed upon neutralization of P(SSH‐co‐MAc) with Cu(OH)2 or mixing of P(SSNa‐co‐MANa) with CuSO4 revealed that the strength of counterion binding by the sulfonate groups is, in fact, comparable with the complexation of Cu2+ ions with the carboxylate groups of MAc. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 1149–1158, 2008

Spontaneous Self‐Assembly and Micellization of Random Copolymers in Organic Solvents

“…When the copolymer was added to the solution, the intensity of the peak at 703 nm increased with a slight shift to lower wavelengths. These changes in the UV spectrum indicate the complexation of Cu 2+ ions with carboxylate groups . Both the shift and the intensity enhancement were more pronounced with increasing Cu 2+ ion concentration.…”

Sulfonated Magnetic Nanocomposite Based on Reactive PGMA-MAn Copolymer@Fe3O4 Nanoparticles: Effective Removal of Cu(II) Ions from Aqueous Solutions

“…Therefore, an effective and simple method is urgently needed to synthesize modified magnetic polymeric nanomaterials with high saturation magnetization and relative large specific area which have good functional groups as binding sites (contain donors O, N, and S heteroatoms) for removal of heavy metals [27][28][29][30]. For this reason, a new reactive copolymer based on glycidyl methacrylate (GMA) and maleic anhydride (MAn) with reactive functional groups was applied for easy functionalization and also -SO 3 H group was selected as functional group for its effective adsorption of toxic metal ions by using sulfanilic acid compound [31,32].…”