Preparation and adsorption property of polyacrylamide/peach gum polysaccharide/attapulgite hybrid hydrogel
Polyacrylamide/peach gum polysaccharide/attapulgite hybrid hydrogel(PAAm/PGP/ATP)was prepared by redox polymerization,and used as an adsorbent to remove the anionic dye neocarmine from aqueous solution.The hybrid hydrogel was characterized by Fourier transform infrared spectroscopy(FT-IR),thermogravimetry(TG)and scanning electron microscope(SEM),and the adsorption kinetics,thermodynamics and isothermal adsorption behavior of the hybrid hydrogel were studied.The results showed that the hybrid hydrogel with micron pores was successfully prepared by redox polymerization,and the maximum water uptake was 11.2g/g.The adsorption equilibrium time of PAAm/PGP/ATP hybrid hydrogel was 10 min,and the adsorption process with endothermic and spontaneous feature fitted the pseudo-first-order kinetic model and followed the Langmuir isotherm model.The maximum adsorption capacity of the hydrogel towards neocarmine was 504.5mg/g.
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