东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (9): 1322-1326.DOI: 10.12068/j.issn.1005-3026.2017.09.022

• 资源与土木工程 • 上一篇    下一篇

乙硫氮对土壤中Cr3+和Ni2+的钝化性能

刘文刚， 赵亮， 魏德洲， 张瑞洋   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 收稿日期:2016-04-13 修回日期:2016-04-13 出版日期:2017-09-15 发布日期:2017-09-08
  • 通讯作者: 刘文刚
  • 作者简介:刘文刚(1981-)，男，山东潍坊人，东北大学教授，博士生导师.
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N160105001，N150101001)； 水体污染控制与治理科技重大专项项目(2012ZX07202003).

Immobilization Property of Sodium Diethyl Dithiocarbamate on Cr3+ and Ni2+ in Soil

LIU Wen-gang， ZHAO Liang， WEI De-zhou， ZHANG Rui-yang   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2016-04-13 Revised:2016-04-13 Online:2017-09-15 Published:2017-09-08
  • Contact: LIU Wen-gang
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摘要： 通过土柱淋滤试验考察了乙硫氮对土壤中Cr3+和Ni2+两种重金属离子的钝化性能.试验结果表明，乙硫氮对土壤中的Cr3+和Ni2+具有很好的钝化效果，而且乙硫氮对Cr3+的钝化性能更为显著.随着乙硫氮用量的增加，重金属钝化率逐渐升高，在乙硫氮用量为110g·kg-1时，Cr3+和Ni2+的钝化率均达到99%以上.淋滤液pH值对钝化效果有一定的影响，随着淋滤液pH值的降低，乙硫氮对Cr3+和Ni2+的钝化性能逐渐减弱，但钝化率仍较高，都在90%以上.Cr3+的钝化率随淋滤液pH值的降低有小幅下降，但均在99.68%以上.XRD检测和配位化学分析结果表明，乙硫氮与Ni2+和Cr3+形成了配位数为4和6，分子式为Ni(DDTC)2和Cr(DDTC)3的四元环螯合物沉淀.同时，Cr(DDTC)3的稳定性要远高于Ni(DDTC)2，因此，乙硫氮对Cr3+具有更好的钝化性能.

关键词: 乙硫氮, 重金属, 钝化, 土壤, 螯合物沉淀

Abstract: Immobilization property of sodium diethyl dithiocarbamate (DDTCNa) on Cr3+ and Ni2+ in polluted soil was investigated by column leaching process. Experimental results indicated that good immobilization effect of heavy metals in polluted soil was obtained when DDTCNa was used. Especially， DDTCNa showed better immobilization effect on Cr3+. Immobilization rate of heavy metal increased with the increase of DDTCNa dosage. When DDTCNa dosage was 110g·kg-1， more than 99% of Cr3+ and Ni2+ can be immobilized. Additionally， leaching pH had some effect on immobilization of Cr3+ and Ni2+. With the reducing of leaching pH， immobilization effect of Cr3+ and Ni2+ decreased. However， high immobilization rate of Cr3+ and Ni2+， which were more than 90%， could also be obtained. And immobilization rate of Cr3+， which was higher than 99.68%， decreased slightly with the reduction of leaching pH. The formation of metal sulfide chelating precipitates and the immobilization mechanism were systematically studied by XRD measurements and coordination chemistry analysis. The results showed that four-membered chelating precipitates with the coordination number of 4 and 6， respectively， which were Ni(DDTC)2 and Cr(DDTC)3， could be obtained when DDTCNa reacted with the heavy metals. Moreover， the stability of Cr(DDTC)3 was much better than Ni(DDTC)2， so better immobilization property of Cr3+ was obtained.

Key words: sodium diethyl dithiocarbamate (DDTCNa);heavy metals, immobilization, soil, chelating precipitates

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