Polyaniline/sulfonated‐covalent organic polymer nanocomposite: Structural and dye adsorption properties

Abstract The aim of this work is developing an adsorbent for the removal of anionic Acid Blue 45 dye from aqueous solutions. In this regard, the polyaniline/sulfonated‐covalent organic polymer nanocomposites (PANI/S‐COP NCs) were synthesized by in situ chemical polymerization method. The structure and morphology of these prepared nanocomposites were characterized by different techniques. The structural stability of the synthesized adsorbent was examined under different pH conditions. To optimize the adsorption conditions, various parameters such as pH, dye concentration, adsorbent dosage, contact time, and temperature were investigated. The maximum adsorption capacity of the prepared composite for 100 ppm of dye (at 25.0°C, pH: 5, and time: 120 minutes as optimum conditions) was 117 mg g −1 . Different adsorption models were applied for the fitting of the obtained experimental data. It was found that the adsorption data can be well fitted to the linear Langmuir model ( R 2 : .999). The adsorption kinetics can also be well described by the linear pseudo‐second‐order model, indicating the chemical adsorption mechanism for the dye molecules on the PANI/S‐COP NCs surface.