壳聚糖改性及其性能地研究.pdf

摘要壳聚糖来源丰富、价格低廉、可以生物降解,是环境友好型材料。近年来, 壳聚糖及其衍乍物作为吸附剂的研究,受到了越米越多的关注。壳聚糖作为吸附剂,有良好的吸附性能,但是它耐酸件较差、吸附量低等限制了它的进一步推广应用。为此,本文以壳聚糖为原料,合成成新型吸附剂,并对它们的合成条件及吸附性能做了研究。首先,利用壳聚糖与丙酮酸反应,再用NaBIt。还原,制备出丙酮酸壳聚糖(PCTS),采用红外光谱、场发射扫描电镜、XRD及元素分析仪对其结构进行表征。实验结果表明,PCTS最佳工艺条件为:,, 丙酮酸与壳聚糖上氨基摩尔比为2:1,%。,0。179/L PCTS对30mLlOmg/L的Cu小的吸附平衡时间为lh,; , 79/LPCTS对30mLlOmg/L的Pb2+的吸附平衡时间为2h,;, PCTS对30mLlOmg/,。以环氧氯丙烷为交联剂,丙酮酸壳聚糖PCTS的基础上进行交联反应,得到交联产物(PCTSO),并接枝二乙烯三胺,生成二乙烯三胺交联接枝壳聚糖(CPCTS)。采用红外光谱、场发射扫描电镜、XRD及元素分析仪对其结构进行表征。实验结果表明CPCTS最佳工艺条件为:二乙烯三胺和PCTSO物料比为2:1,反应温度70 ℃, mol/L,反应时间5h,%以上。, +的吸附平衡时间为4h,最人的吸附量为 :, CPCTS对50mLlOmg/L的Pb2+的吸附平衡时间为3h,;, CPCTS对 50mLlOmg/L的Cd2+的吸附平衡时间为5h,。对CPCTS吸附做重复使用实验,实验表明,CPCTS有良好的重复实用性,在重复五次吸附之后,对铅离子和镉离子去除率仍能达到95%以上,对铜离子的去除率达到85%以上。关键字:壳聚糖,丙酮酸,二乙烯三胺,改性,吸附,重金属离子 Abstract Chitosan,with richsource,low cost,isenvironmentally friendly materials,and Can recent years,chitosan and itsderivatives asadsorbent,got more andmore asadsorbent,has thegood adsorption performance,but itsbadacidproof,the lowe adsorption quantity limit , thisarticletakes thechitosan as raw materials,synthesis new adsorbent,and study theirsynthesis conditions andadsorptionperformance. First,Pymvate chitosan(PCTS)Was essfully prepared from chitosan and pyruvic acid,after reductived structure ofPCTS were determined by IRabsorption,field emissionscanning electronmicroscopy,XRD resultsshowed thatthebestsynthesis conditionwas,the reaction ,, pyruvicacid谢th chitosan amino mole ratio on 2:1 forthesubstitutiondegree %: chitosan(PCTS)adsorpted 30mLlO mg/L ofthe Cu(II)at pH forh,achieveed adsorptionequilibrium,the maximum adsorption ,