制备N--烷基化改性壳聚糖微球, 研究了溶液pH值、2,4-二硝基酚浓度、温度和氯化钠含量等因素对其吸附性能的影响. 结果表明,庚醛改性壳聚糖微球具有较好的抗酸碱性能;溶液的pH值对庚醛改性壳聚糖微球吸附性能的影响较大, pH值为3.6、吸附时间为1 h时,对2, 4--二硝基酚的吸附量最大(达到400 mg×g-1);2, 4--二硝基酚浓度对吸附的影响符合Freundlich等温方程;改性壳聚糖微球对2, 4-二硝基酚的吸附性能明显优于未改性的壳聚糖,对浓度为15 mg×L-1的2, 4--二硝基酚溶液的吸附量分别为3.0 mg×g-1和1.45 mg×g-1.
The chitosan microspheres were prepared by inverse phase suspension method in this study. The chitosan was modified by reducing Schiff`s bases formed from the reaction of n-heptaldehyd and chitosan. The structure of microspheres were characterized by FTIR and SEM. The effects of adsorption conditions, such as time, pH, temperature ,the concentration of 2,4-dinitrophenol and the amount of sodium chlorind on the adsorption were investigated. The experimental result indicated that micropheres were able to adsorb 2,4-dinitrophenol very well. In an aqueous solution at pH 3.6，the adsorption reached to 400 mg•g-1 in 1 hour. The adsorption data of 2,4-dinitrophenol on the modified chitosan microspheres was fitted to the Freundlich isotherm.
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