Preparation and Adsorption of Double Crosslinked Starch Hydrogel for Crystal Violet
Sweet potato starch and high straight chain corn starch were selected as the raw material,epoxy chloropropane(ECH)as a crosslinking agent to prepare starch hydrogel,and then borax,glutin,and PEG2000 were used as the secondary crosslinking agents to get crosslinked starch hydrogel.The re-sults showed that the best reaction conditions for the preparation of crosslinked starch hydrogel were:when the concentration of starch was 10%,the ratio of the amount of substance of ECH with the starch and sodium hydroxide with the starch were 2:1,1:1 respectively,the reaction temperature was at 40℃for 60min,afterwards the starch hydrogel was soaked with 2%borax solution,which proved to be the best.As a result,double crosslinked starch hydrogel with high absorption and good adsorption abilities was prepared.In the end,the adsorption test results showed when the crystal violet(CV)concentration was be-tween 10-100 mg/L,the adsorption rate initially increased and then reduced.The highest absorption rate of the gel to water was 330.2%,the largest adsorption percentage of CV was 93.48%at the concentration of 50mg/L;and the maximum adsorption amount was 30.79mg/g at the concentration of 100 mg/L.
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