Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (3): 875-882.doi: 10.13278/j.cnki.jjuese.20190062

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Stability of Pb2+ Passivation Products for Heavy Metal Contaminated Soil Remediation

Zhao Yuyan, Jiang Weiming, Zang Libin, Sun Wen, Tang Xiaodan   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2019-06-28 Published:2020-05-29
  • Supported by:
    Supported by National Key R&D Program of China (2016YFC0600606), Environmental Protection Research Project of Jilin Province Department of Ecology and Environment (Jihuan Kezi No. 2019-12) and Basic Scientific Research Service Expenses Project of Chinese Academy of Geological Sciences (AS2016P02)

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Abstract: The heavy metal elements in soil under natural conditions is a core concern in the solidification remediation of heavy metal pollution. Taking the common heavy metal Pb2+ as an example, the authors calculated the binding stability of heavy metals with ion groups in soil through applying the first principle to the analysis. The free energy, energy band,and density of states of PbCO3, PbSO4, PbCl2, Pb3(PO4)2, PbAl2O4, and Pb3Fe2(PO4)4 were calculated. The binding stability of Pb2+ with anions in soil such as CO32-, SO42-, Cl- and PO43- was deduced firstly, and then the influence of adding metal cations of Al3+ and Fe3+on the stability. The results show that the trend of free energy of lead compounds is Pb3Fe2(PO4)4 < Pb3(PO4)2 < PbSO4 < PbCO3 < PbAl2O4 < PbCl2, and the corresponding order of structural stability is PbCl2 < PbAl2O4 < PbCO3 < PbSO4 < Pb3(PO4)2 < Pb3Fe2(PO4)4. Through the analysis of energy band and density of states, it is considered that the introduction of SO42- and PO43- can enhance the stability of the lead-containing system, and further addition of the metal cation Fe3+ will make the system more stable. It is suggested that SO42- and PO43- are suitable functional groups for the treatment of Pb2+ pollution, and the substances easily to release SO42- and PO43- should be selected as the appropriate passivator.In future work, sodium dihydrogen phosphate,sodium sulfate and desulfurized gypsum can be used as passivators in field experiments.

Key words: Pb2+, first principle, free energy, band structure, density of states, stability

CLC Number: 

  • P594
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