Comparative study on Pb2+ adsorption using spinel nanostructures-embedded Graphene Oxide
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Abstract
This study investigates the adsorption performance of spinel nanostructures-embedded graphene oxide (GO) for removing toxic Pb2+ ions from water. The graphene oxide nanocomposites containing Fe3O4, CoFe2O4, and NiFe2O4 nanoparticles were synthesized and characterized. The NiFe2O4/GO nanocomposite exhibited the highest Pb2+ adsorption capacity, reaching 96.1% removal at 75 minutes contact time with initial Pb2+ concentration of 10 ppm. The CoFe2O4/GO nanocomposite achieved 90.3% Pb2+ removal under similar conditions, while Fe3O4/GO showed 88.8%. Kinetic studies revealed the adsorption followed a pseudo-second-order model with R2 values of 0.99-1.00. The adsorption mechanism involves surface adsorption on GO sheets and spinel nanoparticles. The nanocomposites demonstrated good recyclability, maintaining over 65% removal efficiency after three consecutive cycles. This study provides insights into designing effective adsorbents for mitigating potentially toxic elements pollution in water, addressing environmental and public health challenges.
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References
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