synthesis of a new porous graphene oxide framework (gof) for high-performance ultrasonic-assisted removal of cadmium and lead ions from aqueous solution

A novel chelating adsorbent was successfully synthesized by cross-linking of 4, 4’, 4&-s-triazine-1, 3, 5-triyltri-p-aminobenzoic acid as a linker with nanosheets of graphene oxide to provide a 3-dimensional framework. therefore, the adsorption process cd2+ and pb2+ on the adsorbent was investigated by employing an ultrasonic bath. the optimum condition containing the small amount of adsorbent (10 mg) for both metals at ph=8 for cd2+ and ph=5 for pb2+, and a short time of two minutes caused gaining an absorption capacity at a high level. the presence of nitrogen-functionalized groups in the porous graphene oxide framework (gof) contributed to the absorption of lead and cadmium ions. to define the kinetic process the kinetic models of pseudo-first-order and pseudo-second-order were used. the experimental adsorption datum was properly-suited to the kinetic model of the pseudo-second-order (r2=0.99). it indicated that adsorbing ions of heavy metals onto gof happens through a chemical process and adsorption isotherms of cd2+ and pb2+ ions were in high-grade accordance with the longmuir model. eventually, because of the rapid adsorption kinetics, high capacity for removing, perfect stability, and being reusable, this gof can be used as a remediation adsorbent with high-performing heavy metals removal from aqueous solutions.