Analysis and modeling of fixed bed column operations on flumequine removal onto activated carbon: pH influence and desorption studies

In dynamic adsorption, the influence of several operation conditions such as initial concentration, volumetric flow rate and mass of adsorbent was evaluated. Experimental data were fitted to the Thomas model. The adsorption capacity of flumequine-activated carbon at various pH values was investigated. Results showed that pH values lower or higher than 6.3 (natural pH) decreased the adsorption capacity. Desorption studies of flumequine from activated carbon were developed. Experimental adsorption capacity values were fitted to Bangham and intra-particle diffusion models in order to propose and adsorption mechanism.