Abstract: Heavy metal chelate DTCS was synthesied by amination and nucleophilic addition using St-g-NMA graft copolymer（N-methylolacrylamide grafted cassava starch）as starting material，diethylenetriamine as an amination agent and carbon disulfide as a nucleophilic addition reagent. Effects of reaction temperature and time，content of CS2 and solvent，as well as the alkalinity of reaction medium on sulphur content in DTCS were investigated. Meanwhile，the structure of DTCS was characterized by FTIR. The optimal synthetic conditions were found as：T=45 ℃，t=18 h，VCS2=1.5 mL，VS=40 mL，aNaOH=0.4. The obtained DTCS showed a sulphur content of higher than 6%，with which the removal efficiency of several heavy metal ions was close to 100%. FTIR analysis proved that the St-g-NMA graft copolymer was successfully modified by DTC.

摘要： 以木薯淀粉-N-羟甲基丙烯酰胺接枝共聚物（St-g-NMA）为主要原料，通过二硫代氨基甲酸盐（DTC）改性合成重金属离子螯合剂（DTCS），考察了反应温度、时间、CS2用量等多因素对反应过程的影响，并通过红外光谱对其结构进行表征。实验结果显示，反应温度和时间、CS2用量、溶剂用量、NaOH用量对反应过程影响显著，最佳反应条件为T=45 ℃、t=18 h、VCS2=1.5 mL、VS=40 mL、NaOH质量分数=0.4，合成的DTCS对多种重金属离子去除率接近100%；红外光谱表征证明氨基和—CS2基团成功引入螯合淀粉骨架中。