重金属捕集剂TDDP的合成及性能研究

Synthesis of Heavy Metal Capturing Agent TDDP and Investigation on Its Performance

以二并哌嗪和二硫化碳为原料合成了一种四基配位重金属捕集剂N,N,N,N-4(二硫代羧基)二并哌嗪(TDDP),并考察了其在不同条件下对含铜锌铅废水处理效果.实验结果表明,处理10 mg/L的含Cu^(2+)、Pb^(2+)、Zn^(2+)废水,pH值为4～11,n(TDDP)/n(重金属离子)=0.6,反应时间5 min,废水中重金属离子剩余浓度分别为0.35、0.39、0.89 mg/L,达到国家工业污染物排放标准(GB 25466—2010).在混合离子溶液中,酸性条件下TDDP对重金属螯合能力大小排序为:Cu^(2+)>Pb^(2+)>Cd^(2+)>Zn^(2+).

A new kind of four-group coordination agent tetra(dithiocarbamate)dipiperazine(TDDP)was synthesized by dipiperazine and carbon disulfide,And the treatment efficiency of TDDP as a capturing agent on heavy metal waste water under different conditions was investigated.The experimental results showed that:for 10 mg/L mass concentration of Cu^2+,Pb^2+,Zn^2+,the residual concentration could be reduced to 0.35 mg/L,0.39 mg/L,0.89 mg/L in the conditions of n(TDDP)/n(metal ions)=0.6,pH 4-11 and 5 min of reaction time.Besides TDDP was selective for removing heavy metal ions,the chelating ability of TDDP for heavy metal ions is Cu^2+>Pb^2+>Cd^2+>Zn^2+in acidic condition.