Synthesis of a highly porous three-dimensional PVA/GO/ZIF-67 cryogel for the simultaneous treatment of water contaminated with cadmium(ii) and lead(ii) heavy metal ions

Binary adsorption of Pb 2+ and Cd 2+ on the PVA/GO/ZIF-67 cryogel was investigated. The mechanism of electrostatic attraction, ion exchange, physical and chemical adsorption dominates the adsorption process.