Preparation of hydroxypropyl trimethyl ammonium chloride chitosan/polyacrylamide composite hydrogel and study on its adsorption performance for Congo red
Acrylamide (AM) and ammonium persulfate (APS) are used as monomer and initiator,respectively to synthesize polyacrylamide (PAM) through free radical polymerization,which is then combined with hydroxypropyl trimethyl ammonium chloride chitosan (HACC) to form a HACC/PAM composite hydrogel.The prepared HACC/PAM hydrogel is characterized by means of SEM-EDS,FT-IR,XPS,and Zeta potential analysis.Its swelling behavior and reusability are also evaluated.Furthermore,the influences of initial concentration,adsorption time,pH,and temperature on the hydrogel's adsorption capacity for Congo red dye are studied.It is shown that the adsorption of Congo red by HACC/PAM hydrogel reaches the equilibrium,with a capacity of 183.22 mg/g when pH is 7,temperature is 25℃,the initial concentration of Congo red is 250 mg/L and the adsorption time is 60 min.It is revealed through adsorption isotherm and kinetic model fitting that the hydrogel's adsorption for Congo red follows the Langmuir isotherm model and pseudo-second-order kinetics,with a theoretical maximum adsorption capacity of 214.71 mg/g.Based on characterization and adsorption behavior analysis,the adsorption of Congo red by the HACC/PAM hydrogel is identified as a monolayer chemisorption process,jointly influenced by hydrogen bond formation,electrostatic interaction,and intra-particle diffusion.
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