Synthesis of a Sodion Tetraethylenepentamine-multi Dithiocarbamate and Its Removal Performance for Heavy Metals
Synthesis of a Sodion Tetraethylenepentamine-multi Dithiocarbamate and Its Removal Performance for Heavy Metals
复制标题
DOI：
--
复制
发表时间：
2011
影响因子：
--
通讯作者：
Ling Yulin
中科院分区：
文献类型：
--
作者：
Ling Yulin
以四乙烯五胺（TEPA）、NaOH和CS2为原料，在无水乙醇中合成了四乙烯五胺-多硫代氨基甲酸钠（TEPAMDT），用红外光谱和紫外光谱对其结构进行了表征，测定了其对废水中游离态和络合态Cu 2+、Ni 2+的去除效果，并用扫描电镜和能谱分析了絮凝物的形貌和组成。结果表明，TEPAMDT具有良好的絮凝效果，其絮凝效果优于TEPA。对于含有游离Cu 2+或Ni 2+的重金属废水，当CSS-与Cu 2+和Ni 2+的摩尔比分别为1.94∶1和2.00∶ 1时，Cu 2+和Ni 2+的去除率分别达到99.90%和99.80%以上，对于含50 mg /L硫脲或柠檬酸络合物的重金属废水，当螯合剂与Cu 2+的摩尔比为1∶1时，当CSS-与Cu ~（2+）的摩尔比分别为2.05∶1和2.12∶1时，Cu ~（2+）的去除率分别达到99.98%和99.94%，对于含50 mg /L Ni 2 +-硫脲或Ni 2 +-柠檬酸络合物的重金属废水，结果表明，当CSS-与Ni 2+的摩尔比分别为2.10∶1和2.19∶1时，对Ni 2+的去除率分别达到99.93%和99.91%，絮凝和能谱分析结果表明，CSS-与Cu 2+或Ni 2+按2∶1的化学计量比反应生成螯合物，TEPAMDT的适宜pH范围较宽。
A sodion tetraethylenepentamine-multi dithiocarbamate(TEPAMDT) was prepared from tetraethylenepentamine(TEPA),NaOH and CS2 in anhydrous ethanol,and its structures were characterized by FTIR and ultraviolet spectroscopy.Itsremoval efficiencies for free or complex Cu2 + and Ni2 + in wastewater were determined,and floc images and compositions wereinvestigated by using scanning electron microscope and energy spectrum analysis,respectively.The results show that,for heavymetal wastewater containing free Cu2 + or Ni2 +,when the molar ratios of CSS-to Cu2 + and Ni2 + were 1.94∶1 and 2.00∶ 1,respectively,the removal rates of Cu2 + and Ni2 + were above 99.90% and 99.80%,respectively.For heavy metal wastewatercontaining 50 mg /L Cu2 +-thiourea or Cu2 +-citric acid complexes with molar ratio of chelating agent to Cu2 + of 1∶1,when the molarratios of CSS-to Cu2 + were 2.05∶1 and 2.12∶1,respectively,the removal rates of Cu2 + were up to 99.98% and 99.94%,respectively.For heavy metal wastewater containing 50 mg /L Ni2 +-thiourea or Ni2 +-citric acid complexes with molar ratio ofchelating agent to Ni2 + of 1∶1,when the molar ratios of CSS-to Ni2 + were 2.10∶1 and 2.19∶1,respectively,the removalrates of Ni2 + were up to 99.93% and 99.91%,respectively.Both flocculation and energy spectrum analysis results indicated that CSS-reacts with Cu2 + or Ni2 + to form chelates accordingto a stoichiometric ratio of 2∶1,and TEPAMDT has a widelysuitable pH range.