利用戊二醛(GLA)交联并负载La3+的壳聚糖吸附净化高氟地下水时,反应不完全的戊二醛可能会溶出而产生较大的生物毒性.选用低毒的乙二醇二缩水甘油醚(EGDE)替代GL A,对壳聚糖实施交联改性,生成交联壳聚糖微球( CEB),然后在CEB表面螯合La3+,制备新型除氟剂(CEB-La).结果表明,交联温度是影响CEB-La吸附性能的最主要因素,交联的适宜条件为EGDE与CS的-NH2物质的量比为1∶2,20℃反应4h；螯合的适宜条件为将CEB按投加量2g/L加到0.020mol/L的La3+溶液中,40℃反应3h.所得到的吸附剂具有良好的稳定性,对质量浓度20mg/L含氟水的F-去除率达96％.红外光谱分析表明,EGDE与壳聚糖的-NH2、C6-OH发生交联反应,形成的交联产物CEB中,仲羟基与La3+配位.X射线衍射分析表明,壳聚糖微球在制备过程中结晶能力下降,有利于La3+的负载和F-的吸附,除氟剂中的镧主要以La-O化物的形式存在.
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