以壳聚糖( CS)为原料,先制备出O-羧甲基壳聚糖( OCMC),再和二硫化碳在碱性条件下合成O-羧甲基黄原酸壳聚糖( CXCS)。通过产物的含硫量对碱浓度、投料比和反应时间等因素进行了优化,采用固体13 C-NMR和SEM表征其结构。结果表明,合成CXCS的最佳条件为碱浓度10%,投料比1∶1,室温反应3h,产品的含硫量达10．22%。最后研究了CXCS对水溶液镉离子的吸附性能,结果表明CXCS具有优异的吸附性能,其最大吸附量可达288．5 mg/g,是壳聚糖吸附量的2．65倍。红外分析结果表明吸附主要依靠结构中的羧基和黄原酸基团。%O-carboxymethyl chitosan(OCMC) was first prepared with chitosan as material,then carboxymethyl xanthated chitosan ( CXCS) was synthesized by OCMC and CS2 under alkaline condition. Some reaction conditions such as concentration of NaOH,mass ratio of OCMC to CS2 and reaction time were explored through sulfur content of CXCS and the chemical structure of CXCS was char-acterized by solid state13 C-NMR spectrum and SEM. The best reaction conditions were as follows:concentration of NaOH,10%;mass ratio,1∶1;reaction time,3h. Under these conditions,the sulfur content of CXCS was 10. 22%. The adsorption ability of Cd2+on CXCS was investigated. The experimental results showed the CXCS has excellent adsorption for Cd2+. The maximum adsorption ca-pacity of Cd2+ was 288. 5 mg/g,which was 2. 65 times of chitosan. From the FTIR analysis,-COO- and S=C-S- groups of CXCS participated in the adsorption process.
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