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Volume 41 Issue 7
Jul.  2023
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2023  >  41(7): 150-158
ZHOU Ziyan, HUANG Xiang, GU Jinchuan, XUE Jia, WU Yi, YONG Yi. PASSIVATION OF ZINC, LEAD AND CADMIUM CONTAMINATED SOIL BY INORGANIC SALT MODIFIED BENTONITE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(7): 150-158. doi: 10.13205/j.hjgc.202307021
Citation: ZHOU Ziyan, HUANG Xiang, GU Jinchuan, XUE Jia, WU Yi, YONG Yi. PASSIVATION OF ZINC, LEAD AND CADMIUM CONTAMINATED SOIL BY INORGANIC SALT MODIFIED BENTONITE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(7): 150-158. doi: 10.13205/j.hjgc.202307021
shu

PASSIVATION OF ZINC, LEAD AND CADMIUM CONTAMINATED SOIL BY INORGANIC SALT MODIFIED BENTONITE

doi: 10.13205/j.hjgc.202307021

  • 1. School of Civil Engineering, Architecture and Environment, Xihua University, Chengdu 610039, China;

  • 2. Sichuan Academy of Environmental Sciences, Chengdu 610041, China;

  • 3. Sichuan Key Laboratory of Pollution Control for Heavy Metals, Chengdu 610041, China;

  • 4. College of Food and Bioengineering, Xihua University, Chengdu 610039, China

  • Received Date: 2022-07-25
    Abstract
  • The synchronous passivation of soil contaminated with high concentration of heavy metals is a difficulty in soil passivation research. In this paper, the synchronous passivation effect of various inorganic salts modified bentonite on soil contaminated with high concentration of heavy metals was studied. The results showed the modified bentonite prepared by NaCl, KCl, Na2CO3, K2CO3, NaNO3, KNO3, Na3PO4, KH2PO4, KMnO4, K3PO4, NaH2PO4 and NaHCO3 under the same condition had obvious differences in the synchronous passivation effect of multiple heavy metal high concentration composite polluted soil. Na2CO3, K3PO4 and NaH2PO4 were selected, by their performance to optimize the modification conditions. Under the optimal modification conditions, the synchronous passivation effect of NaH2PO4 modified bentonite was the best overall. The reduction rates of available Zn, Pb and Cd reached 26.28%, 28.84% and 31.42%. In the modification process of NaH2PO4, calcium in bentonite particles could be exchanged and new independent crystals of CaHPO4·2H2O could be formed. Meanwhile, bentonite particles have better intercalation, layered structure, fracture structure and wider distribution of Na+. Cation exchange interaction during bentonite modification may further promote the passivation effect of modified bentonite on heavy metals.
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