Polyaniline (PAni), cellulose fiber (CF) and a PAni–CF composite, which were characterized by infrared spectroscopy, scanning electron microscopy and thermogravimetry, were investigated in adsorption studies of meloxicam (MLX) from aqueous media.

Understanding the adsorption mechanisms of drugs on the surfaces of solid materials is important for determining the fate of these compounds in aqueous samples as water or wastewater treatment. A composite based on polyaniline (PAni), polypyrrole (PPy) and cigarette filters (CFs), PAni-PPy-CFs, was prepared, characterized by FTIR, TGA and SEM and applied in investigation of adsorption of a non-steroidal anti-inflammatory, phenylbutazone (PBZ), from aqueous solutions. A batch of experiments were conducted and four kinetic models and five isotherms models were used to describe the adsorption process. The experimental kinetic data were fitted very well with the second-order kinetic model, indicating that PBZ adsorption involves chemical adsorption in different binding sites, which could control the reaction rate. The equilibrium adsorption data were best fitted with the dual-site Langmuir-Freundlich isotherm, with maximum adsorption capacity of 100.22 mg g -1 , which recognizes the existence of two kinds of adsorption sites on the polymer composite surface. Finally, this composite might act as excellent adsorbents for environmental and analytical processes, for example, stationary phases in separation processes.

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