工业水处理 ›› 2025, Vol. 45 ›› Issue (7): 177-182. doi: 10.19965/j.cnki.iwt.2024-0516

• 试验研究 • 上一篇    

TETA-DTC除铅性能评价及分子动力学模拟

唐嘉婧1(), 马超1,2,3(), 倪帅4, 刘超1, 周旭1   

  1. 1. 长江大学石油工程学院,湖北 武汉 430100
    2. 油气钻采工程湖北省重点实验室(长江大学),湖北 武汉 430100
    3. 油气钻完井技术国家工程研究中心,湖北 武汉 430100
    4. 中国石油集团渤海钻探工程有限公司第二固井分公司,天津 300450
  • 收稿日期:2024-10-15 出版日期:2025-07-20 发布日期:2025-07-22
  • 通讯作者: 马超
  • 作者简介:

    唐嘉婧(1999— ),硕士,E-mail:

Evaluation and molecular dynamics simulation of lead removal by TETA-DTC

Jiajing TANG1(), Chao MA1,2,3(), Shuai NI4, Chao LIU1, Xu ZHOU1   

  1. 1. School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
    2. Hubei Provincial Key Laboratory of Oil and Gas Drilling and Production Engineering (Yangtze University), Wuhan 430100, China
    3. National Engineering Research Center for Oil and Gas Drilling and Completion Technology, Wuhan 430100, China
    4. Second Cementing Division, China Petroleum Group Bohai Drilling Engineering Co. , Ltd. , Tianjin 300450, China
  • Received:2024-10-15 Online:2025-07-20 Published:2025-07-22
  • Contact: Chao MA

摘要:

为防止Pb2+过量流入环境对生态产生危害,利用三乙烯四胺和二硫化碳在碱性环境下制备出一种含有双二硫代氨基甲酸基团(DTC)的螯合剂TETA-DTC,对比了TETA-DTC与市售螯合剂处理Pb2+的性能,筛选了TETA-DTC与Pb2+螯合反应的最佳条件,并采用分子动力学模拟的方法揭示了其螯合作用机理。研究结果表明:在Pb2+质量浓度25 mg/L、pH=5的条件下,较市售螯合剂,TETA-DTC对Pb2+具有优良的去除效果,且用量更少;当Pb2+质量浓度为25 mg/L时,TETA-DTC的投加量越大,螯合体系的pH越大,Pb2+去除率越高,综合考虑TETA-DTC投加量60 mg/L、pH=5为螯合去除Pb2+的最佳条件,最佳反应条件下Pb2+去除率达95.21%;分子动力学对TETA-DTC中官能团、原子与Pb2+之间的径向分布模拟表明,TETA-DTC结构中C—S—S基团与Pb2+的作用半径最小,作用强度最大,N1原子次之,N2原子最小,C—S—S基团是关键的螯合基团;分子动力学对不同浓度的螯合剂与Pb2+之间相互作用能的模拟表明,TETA-DTC分子和Pb2+之间的螯合作用较稳定,稳定性随着TETA-DTC分子数量的增加而增加。

关键词: 二硫代氨基甲酸盐, 螯合剂, 铅离子, 分子动力学模拟

Abstract:

To prevent the ecological harm caused by excessive Pb²⁺ flowing into the environment, a chelating agent TETA-DTC containing bis-dithiocarbamate groups (DTC) was synthesized using triethylenetetramine and carbon disulfide under alkaline conditions. The performances of TETA-DTC and commercial chelating agents in treating Pb²⁺ were compared. The optimal conditions for the chelation reaction between TETA-DTC and Pb²⁺ were screened, and the chelation mechanism was explored by molecular dynamics simulation. The results showed that TETA-DTC exhibited superior Pb²⁺ removal efficiency with lower dosage compared to commercial chelating agents under the conditions of 25 mg/L Pb²⁺ and pH=5. When Pb²⁺ mass concentration was 25 mg/L, the removal rate of Pb²⁺ increased with the increase of TETA-DTC dosage and chelation system pH. Considering comprehensively, the optimal conditions for Pb²⁺ chelating removal were determined as a TETA-DTC dosage of 60 mg/L and pH=5, achieving Pb²⁺ removal rate of 95.21%. Radial distribution simulation of functional groups and atoms in TETA-DTC with Pb²⁺ via molecular dynamics indicated that the C—S—S group in TETA-DTC structure had the smallest interaction radius and the strongest binding force with Pb²⁺, followed by N1 atom, and N2 atom showed the weakest interaction, indicating that the C—S—S group served as the key chelating group. Simulation of interaction energy between chelating agents at different concentrations and Pb²⁺ via molecular dynamics revealed that the chelation between TETA-DTC molecules and Pb²⁺ was relatively stable, and the stability enhanced with the increase of TETA-DTC molecular quantity.

Key words: dithiocarbamate, chelating agent, lead ion, molecular dynamics simulation

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