Abstract
In this article, the kinetic studies of thorium adsorption from an aqueous solution with graphene oxide functionalized with aminomethylphosphonic acid (AMPA) as an adsorbent were investigated. Experiments were performed in two batch and continuous modes. The results showed that thorium adsorption follows a pseudo-second-order kinetic model and that the adsorption reaction is endothermic. In continuous conditions, the effect of feed flow rate, initial concentration, and column bed height was investigated. The continuous data was analyzed using Thomas, Yoon-Nelson, and Bohart-Adams models. The experimental data of the column were well matched with the Thomas, Yoon-Nelson model. The research results showed that the use of functionalized graphene oxide adsorbents has a great ability to remove thorium from aqueous solutions.