Abstract To improve the adsorption ability of polypyrrole(PPy), the cheap and readily available biological resources chitosan (CS) was introduced to synthesize PPy-CS composites that were uesed to remove Acid Red… Click to show full abstract
Abstract To improve the adsorption ability of polypyrrole(PPy), the cheap and readily available biological resources chitosan (CS) was introduced to synthesize PPy-CS composites that were uesed to remove Acid Red 18 (AR-18). The structure and morphology of PPy-CS (9:3) composites were characterized by scanning electron microscopy (SEM), Zata potential, Brunauer-Emmett-Teller (BET), and Fourier transform infrared (FT-IR). Various factors were investigated to analyze how to affect the removal process. The reaction model between PPy-CS (9:3) and AR-18 was estimated by adsorption isotherm, thermodynamic parameters, and kinetic studies. The results showed that the adsorption was a spontaneous and endothermic process and the maximum adsorption capacity reached 285.71 mg/g. The removal mechanism suggested that electrostatic attractions and hydrogen bonding played essential roles during the adsorption. Additionally, the species and numbers of functional groups of dyes' molecules exerted a certain influence on the removal process. Also, PPy-CS (9:3) composites still exhibited removal efficiency of 70.83% after six regeneration cycles, which will be helpful in the practical application.
               
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