Hydrogel has attracted more and more attention as a new functional polymer material with application value and economic benefit.Chitosan hydrogel was prepared by free radical graft copolymerization using natural biodegradable polymer chitosan as the carrier.The properties on adsorption and drug controlled release of chitosan hydrogel were studied.The experimental results showed that the hydrogel can be completely degraded for about 20 days,which indicated it with good degradation performance.The adsorption capacity of the hydrogel on copper ions showed that the equilibrium adsorption capacity was up to 225.8mg/g at 25℃,when the concentration of copper ions was 800mg/L.The controlled release results showed that temperature and initial drug dosage had great influence on the controlled release performance,with methylene blue as the drug model.The cumulative release rate reached about 70% in 48h,which may achieve sustained release and controlled release to a certain extent.
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