改性壳聚糖季铵盐的研制及其对高氯酸盐的吸附研究

通过将壳聚糖季铵盐改性以实现固定化,并用于水体中ClO 4-的吸附去除,研究了改性过程相关工艺参数对产物吸附能力的影响,考察了产物的吸附和再生性能.结果表明,戊二醛的交联性能优于甲醛和环氧氯丙烷的交联性能,戊二醛的最佳投加量为6.82%,最佳的反应温度为45℃,pH值在3～12之间交联反应均能很好地进行,从而实现壳聚糖...

Characterization of Cross-Linked Quaternary Chitosan Salt and Its Adsorption of Perchlorate from Water

Cross-linked quaternary chitosan salt was prepared and used to adsorb perchlorate from water. Parameters of cross-linking agent, temperature and pH were investigated to optimize the reaction conditions. The adsorption and regeneration ability of the adsorbent were also conducted. Quaternary chitosan salt could be fixed by cross-linking with glutaraldehyde using ethanol as dispersant. The optimal glutaraldehyde dosage and temperature were 6.82% and 45 degrees C, respectively. The cross-linked reaction was independent of pH with the range from 3 to 12. Quaternary chitosan salt was cross-linked mainly through the reaction between the methyl groups of ammonium on quaternary chitosan salt and the -C=O groups on glutaraldehyde. The optimal pH(zpc) of the adsorbent was about 10.6. The adsorbent showed high efficiency for perchlorate removal, and the adsorption capacity varied from 12.321 mg/g to 117.819 mg/g with the ClO4(-) concentration range from 5 mg/L to 200 mg/L. The spent adsorbents could be effectively regenerated by NaCl brine with the concentration more than 0.3%. The results suggest that the cross-linked chitosan quaternary ammonium salt would be a promising method for perchlorate removal from water.