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首页> 中文期刊> 《环境科学研究》 >四乙烯五胺多(二硫代甲酸钠)的合成及其对重金属的去除性能

四乙烯五胺多(二硫代甲酸钠)的合成及其对重金属的去除性能

         
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摘要

以四乙烯五胺(TEPA),NaOH和CS2为原料,在无水乙醇中合成四乙烯五胺多(二硫代甲酸钠,TEPAMDT),采用红外光谱和紫外光谱对其结构进行表征,测定了其对游离和络合Cu2+及Ni2+废水的处理效果,通过扫描电镜和电子能谱考察了絮体的形貌和组成.结果表明,处理游离Cu2+和Ni2+废水,TEPAMDT中n( CSS- ):n(Cu2+)和n( CSS- ):n(Ni2+)分别为1.94:1和2.00:1时,去除率分别达99.90%和99.80%以上;处理50 mg/L n(硫脲):n(Cu2+)和n(柠檬酸):n(Cu2+)均为1:1的废水,当n( CSS- ):n(Cu2+)分别为2.05:1和2.12:1时,去除率分别达99.98%和99.94%;处理50 mg/L n(硫脲):n(Ni2+)和n(柠檬酸):n(Ni2+)均为1:1的废水,当n( CSS- ):n(Ni2+)分别为2.10:1和2.19:1时,去除率分别达99.93%和99.91%.絮凝和能谱分析结果表明,TEPAMDT中CSS-与Cu2+或Ni2+都按2:1的化学计量比生成螯合物,TEPAMDT具有较宽的pH适用范围.%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. Its removal efficiencies for free or complex Cu2+ and Ni2+ in wastewater were determined, and floc images and compositions were investigated by using scanning electron microscope and energy spectrum analysis, respectively. The results show that, for heavy metal 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 wastewater containing 50 mg/L Cu2+ -thiourea or Cu2+ -citric acid complexes with molar ratio of chelating agent to Cu2 + of 1: 1, when the molar ratios 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 of chelating agent to Ni2+ of 1: 1, when the molar ratios of -CSS- to Ni2+ were 2. 10: 1 and 2. 19: 1, respectively, the removal rates 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 according to a stoichiometric ratio of 2: 1, and TEPAMDT has a widely suitable pH range.

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  • 来源
    《环境科学研究》 |2011年第3期|332-339|共8页
  • 作者

    刘立华; 吴俊; 李鑫; 令玉林;

  • 作者单位

    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;

    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;

    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;

    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;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 助剂;
  • 关键词

    四乙烯五胺多(二硫代甲酸钠); 黄原酸化; 螯合; 絮凝; 去除率;

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