Mesoporous Layered Graphene Oxide/FeO/CNS Polymer Hybrids for Rapid Removal of Pb and Cd from Water.

Mesoporous layered magnetic hybrid GFP2 composed of CNS polymers, FeO nanoparticles (FeO NPs), and graphene oxide with a mesoporous layered "sandwich"-like structure was successfully explored by in situ simple polymerization tactic for rapid removal of Pb and Cd from water. It shows good selectivity and high adsorption capacity (277.78 and 49.75 mg/g) for Pb and Cd, respectively. It exhibits the fast adsorption kinetics (>80% elimination efficiency in less than 30 min). The Langmuir isotherm model based on typical monomolecular layer adsorption fits better with the data of adsorption than the Freundlich isotherm model. The adsorption process of GFP2 for Pb and Cd can be explained well with the pseudo-second-order kinetics model. GFP2 is a kind of recyclable solid absorbent, which is an excellent candidate in the heavy metal wastewater treatment. More importantly, GFP2 was set with FeO NPs which makes it easily separable from wastewater with an extra magnet.