Preparation and adsorption properties of porous double-network hydrogels modified by nitrilotriacetic acid anhydride
Nitrilotriacetic acid anhydride modified polyacrylamide/chitosan double network hydrogel was designed and synthesized,which had good mechanical properties,adsorption properties and a faster adsorption rate.The addition of sodium dodecyl sulfate was helpful to construct a porous structure of hydrogel,and the mechanical strength,swelling resistance and adsorption properties of hydrogel were enhanced by the use of nitrilotriacetic acid anhydride as crosslinking agent and modifier.Taking CrCl3 as the model pollutant,the adsorption performance of CrCl3 was investigated.The results showed that Langmuir isothermal adsorption model and pseudo-second-order kinetic model were more suitable for fitting the adsorption data of Cr3+on hydrogels,indicating that the modified hydrogels had non-uniform surfaces and different binding sites.The maximum adsorption capacity of the modified hydrogel for Cr3+was 570.6mg/g,and the adsorption effect was the best when pH was 4.After 5 sorption-desorption cycles,the removal rate of Cr3+was 83.3%.The design of modified double network hydrogels provided good performance and development potential for the adsorption of heavy metal ions in wastewater.
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