【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用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,反应率可达90%;将制得的CMKGM用环氧氯丙烷交联,并将其用于吸附水溶液中的Pb2+。结果表明,交联羧甲基魔芋葡甘聚糖能有效吸附水中的Pb2+,当取代度(DS)为0.568,Pb2+起始质量浓度为300 mg/L时,吸附容量为29.19 mg/g,去除率仍高达97.3%。更多还原

【Abstract】 Under alkaline conditions,carboxymethyl konjac glucomannan(CMKGM) with different degree of substitution(DS) was prepared through reaction of monochloroacetic acid(MCA) and konjac glucomannan(KGM) using isopropyl alcohol as dispersing agent.The optimum reaction conditions are:n(KGM)∶n(MCA)∶n(NaOH)=1∶1∶2,reaction temperature 50 ℃ and reaction time 4 h.Yield of CMKGM is 90%.Then CMKGM was crosslinked with epichlorohydrin and the prepared products were used to adsorb Pb~2+ from water solution.The results show that crosslinked carboxymethyl konjac glucomannan can effectively adsorb Pb~2+.When DS is 0.568 and original concentration of Pb~2+ is 300 mg/L,the adsorption capacity is 29.19 mg/g and the removed percentage is 97.3%.更多还原