【摘要】 以异丙醇为分散剂,在碱性介质中一氯乙酸(MCA)和魔芋葡甘聚糖(KGM)反应制备了系列羧甲基魔芋葡甘聚糖(CMKGM)。研究了反应时间、反应温度、MCA和NaOH量等因素对取代度及反应率的影响,优化反应条件为:n(KGM)∶n(MCA)∶n(NaOH)=1∶1∶2,反应温度为50℃,反应时间为4 h。将制得的CMKGM用环氧氯丙烷交联,结果表明交联羧甲基魔芋葡甘聚糖(CCMKGM)能有效的吸附水中的Pb2+;且再生后的CCMKGM吸附性能好,解吸附百分率高。更多还原

【Abstract】 Under alkaline conditions,carboxymethyl konjac glucomannan with different degree of substitution（DS） was prepared through the reaction of monochloroacetic acid（MCA） and konjac glucomannan（KGM） using isopropyl alcohol as dispersing agent.The effect of reaction time,reaction temperature,the amount of MCA and NaOH on DS and reaction yield were studied,the optimum reaction conditions are the following:n（KGM）∶n（MCA）∶n（NaOH） =1∶1∶2,reacting at 50 ℃ for 4 h.The prepared products were crosslinked with epichlorohydrin（ECH）,the crosslinked carboxymethyl konjac glucomannan（CCMKGM） was able to adsorb Pb²⁺ effectively,it has good adsorptive performance and the desorption percentage is high.更多还原