Adsorption Isotherm and Kinetic Studies of Copper(II) Removal from Aqueous Solutions Using Graphene Oxide
DOI:
https://doi.org/10.54172/k56j7q87Keywords:
Graphene oxide, heavy metals, adsorption, adsorption capacity, kinetics, thermodynamic parametersAbstract
Graphene oxide (GO) exhibits good chemical stability for water purification applications. GO contains abundant oxygen-containing functional groups, such as hydroxyl, epoxy, and carboxyl moieties, which provide active adsorption sites. These features enable the effective capture of pollutants. In this study, GO was used as an adsorbent to remove Cu(II) ions from aqueous solutions. GO was prepared from graphite using a modified Hummers method and characterized using FT-IR and XRD techniques. Cu(II) adsorption onto GO was evaluated using an atomic absorption spectrophotometer (AAS). The kinetic parameters were determined using pseudo-first-order and pseudo-second-order kinetic models; the results showed that the adsorption process followed the pseudo-second-order kinetic model. The Langmuir, Freundlich, and Temkin isotherm models were applied, with a maximum adsorption capacity of 324 mg.g-1. Thermodynamic parameters, including ∆G◦, ∆H◦, and ∆S◦, were calculated, indicating that the adsorption process was spontaneous and endothermic.
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