Reduced graphene oxide based aerogels: Doped with ternary Prussian blue analogs and selective removal of Cs+ from effluent

Abstract

Reduced graphene oxide aerogels doped with ternary Prussian blue analogs (RGOA/TPBAs) were developed by controlled self-assembly tactics and applied to remove radioactive cesium (Cs) from effluent. The unique three-dimensional layered structure gives RGOA/TPBAs excellent mechanical strength and high-level specific surface area, which facilitates the exposure of adsorption points and thus promotes the adsorption of Cs+. A maximum adsorption capacity of 226.98 mg g−1 (dosage = 0.25 g L−1, pH = 7, T = 298.15 K) was obtained for the composite material, which exhibited excellent adsorption performance for cesium. In addition, RGOA/TPBAs maintained an excellent Cs+ selectivity in a solution containing other ions (m V−1 = 0.25 g L−1, Mn+ = Ca2+, Mg2+, Na+, K+, [Cs+]initial = 10 mg L−1) and the removal rate is more than 90%. The proposed secondary kinetic model (R2 = 0.9982) and fitted the adsorption process well, as does the Langmuir isotherm model (R2 = 0.9929), making it clear that the adsorption is homogeneous monolayer chemisorption. The coexisting ion adsorption experiments illustrate that the good selectivity of the composite.