The present study investigated the application of functinalized adsorbents in the removal of tetracycline in water by adsorption. Activated carbon was impregnated with iron chloride, copper sulfate and hydrogen peroxide, in order to improve its adsorption properties. The solids were characterized by adsorption/desorption isotherms N₂, XRD, FTIR and SEM. The influence of pH, adsorbent concentration and contact time parameters was evaluated. The results using activated carbon as adsorbent and initial TC concentration of 20 mg.L⁻¹ showed that 93% TC removal was achieved at pH 4.0, contact time of 120 minutes and 30 g.L⁻¹ adsorbent concentration. Experiments applying the functionalized solids showed a faster initial adsorption kinetics. Also, no pH adjustment was required (pH 6.0). In addiction, a minimum of 50% reduction in adsorbent mass (15, 10 and 5 g.L⁻¹ for CA-H₂O₂, CA-Fe and CA-Cu, respectively) was observed, compared to the untreated solid. The pseudo-second-order kinetic model was chosen as the optimal model for the study. The application of FeCl₃, CuSO₄ and H₂O₂ composites as adsorbent solids are technically feasible for the removal of tetracycline in wastewater treatment.
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Costa et al. (2020) studied this question.
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