Polypyrrole/sodium alginate(PPy/SA)aerogel and sodium dodecyl sulfonate(SDS)doped polypyrrole/sodium alginate(PPy/SA/SDS)aerogel were prepared by using in-situ chemical oxidation and freeze-drying method.The study compared the preparation processes of the two aero-gels and conducted the mechanical performance tests.The microstructure and morphology of the aer-ogels were characterized by employing infrared spectroscopy,differential scanning calorimetry and scanning electron microscopy.The adsorption performance of aerogel for methylene blue was stud-ied.The results showed that PPy/SA/SDS aerogel had high density,dense surface,three-dimen-sional porous structure with interconnected channels and excellent mechanical properties.The ad-sorption performance of PPy/SA/SDS aerogel was better than that of PPy/SA aerogel,with a maxi-mum adsorption capacity of 17.78 mg/g,after which the second adsorption capacity was 14.33 mg/g.The adsorption kinetics study of PPy/SA/SDS aerogel toward methylene blue showed that the ad-sorption was consistent with Lagrange's pseudo-second-order kinetic equation,indicating that the adsorption process was mainly chemisorptive.
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