摘要
通过异相法的方法合成了絮凝剂羧甲基壳聚糖,根据羧甲基壳聚糖对废水中Cd2+的去除率,利用四因素三水平正交实验优化了羧甲基壳聚糖的合成条件。正交实验的结果表明优化反应条件为:反应时间7h,反应温度为50℃,氯乙酸对壳聚糖的质量比为1.25,氢氧化钠对壳聚糖的质量比为1.0。在此优化条件下得到的羧甲基壳聚糖产品对Cd2+的最大去除率可达99.7%,用IR和1HNMR对相应的产品进行了结构表征,结果表明羧甲基化反应发生在C2位上NH2处的程度高于C6位的OH。
Carboxymethyl chitosan (CM-chitosan) as a flocculant was synthesized in heterogeneous system. According to the rate of removing Cd^(2+) by using CM-chitosan to treat the waste water, the synthetic condition was optimized by 4 factors and 3 levels orthogonal experiment as following: the time of reaction is 7 h and temperature is 50℃, the mass ratio of CICH_2COOH to chitosan is 1.25 and that of NaOH to chitosan is 1.0. Using the product synthesized under this condition to treat wastewater-containing Cd^(2+), the removing rate of Cd^(2+) could be up to 99.7%, and this product was also characterized by IR and ~1 HNMR methods that showed the carboxymethylation at C2 is higher than at C6.
出处
《江苏化工》
2004年第2期27-30,共4页
Jiangsu Chemical Industry
基金
江苏省环保科技发展计划项目基金资助(2002031)
