Novel negatively charged hybrids. 1. copolymers: Preparation and adsorption properties

A series of novel negatively charged hybrid copolymers were prepared via free radical polymerization and sol–gel process using γ-methacryloxypropyl trimethoxy silane (MAPTMS) and acrylic acid (AA) monomers. The copolymers obtained can keep thermally stable up to 420 °C. Moreover, a more stable molecular structure and desirable negatively charged properties can be acquired by adjusting silica content and AA content, respectively. The adsorption behaviors of the copolymers were conducted by the aqueous solution containing Cu2+ and Pb2+ ions. It is indicated that the adsorption followed Lagergren second-order kinetic model and Freundlich isotherm model, suggesting that the adsorption process can be ascribed to chemosorption. According to the adsorptional capacity, the obtained copolymers can be potentially applied in the separation and recovery of heavy metal ions from waste chemicals and contaminated water.