乙二胺多(二硫代甲酸钠)的合成及对含铜废水的去除性能  

Synthesis of a sodium ethylenediamine-multidithiocarbamate and its removing performance for Cu^(2+)

作　　者：刘立华[1] 李鑫[1] 曾荣今[1] 令玉林[1] 曹菁[1] 李波[1] 

机构地区：[1]湖南科技大学,化学化工学院,理论化学与分子模拟省部共建教育部重点实验室,分子构效关系湖南省普通高等学校重点实验室,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2012年第2期96-100,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金项目(51078141);湖南省科技计划项目(2010FJ3030);湖南科技大学研究生创新基金资助项目(S100123)

摘　　要：以乙二胺、二硫化碳和氢氧化钠为原料在无水乙醇中合成了乙二胺多(二硫代甲酸钠)(EDAMDT),采用红外光谱和元素分析对其结构进行表征,考察了其对游离态和络合态Cu2+的去除效果以及沉渣稳定性.结果表明,处理50 mg/L游离态Cu2+、硫脲-Cu2+和柠檬酸-Cu2+,EDAMDT最佳投药量分别为183.5 mg/L、196.7 mg/L和204.3 mg/L,Cu2+的去除率分别为99.94%、99.26%和99.31%,残余Cu2+浓度均达到国家污水综合排放一级标准(GB8978-1996);EDAMDT的pH适用范围为3.36～11.24.在最佳用量时,EDAMDT中螯合基团-CSS-与Cu2+的摩尔比均接近于2∶1,表明-CSS-与Cu2+按摩尔比2∶1形成螯合物.螯合沉淀物EDAMDT-Cu具有良好的稳定性,不易产生二次污染.A sodium ethylenediamine-multidithiocarbamate（EDAMDT） was prepared from ethylenediamine,NaOH and CS2 in anhydrous ethyl alcohol.The structure of EDAMDT was characterized by IR and elementary analysis,and the removal rates of EDAMDT for free and complex Cu2＋ in wastewater and the stability of the chelating precipitates were also investigated.The results show that,for the free Cu2＋,complexes of Cu2＋-citric acid and Cu2＋-thiourea whose concentrations are all 50 mg/L,the optimum dosages of EDAMDT are 183.5 mg/L,196.7 mg/L and 204.3 mg/L,respectively,and the removal rates of Cu2＋ are up to 99.94%,99.26% and 99.31%,respectively,and the residual Cu2＋ concentrations all meet the first grade criteria of China’s Integrated Wastewater Discharge Standard（GB 8978-1996）.EDAMDT possesses a wider suitable pH range of 3.36~11.24.The molar ratios of-CSS-to Cu2＋ are all close to 2∶ 1,indicating that-CSS-reacts with Cu2＋ to form chelates according to a molar ratio of 2∶ 1.The chelating sediment of EDAMDT-Cu posses excellent stability,and has no risk of the secondary pollution in water environment.

关 键 词：乙二胺多(二硫代甲酸钠) 含铜废水 去除率 稳定性 

分 类 号：X703.5[环境科学与工程—环境工程]