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

ZHOU Ziyan; HUANG Xiang; GU Jinchuan; XUE Jia; WU Yi; YONG Yi

doi:10.13205/j.hjgc.202307021

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

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

doi: 10.13205/j.hjgc.202307021

ZHOU Ziyan¹,
HUANG Xiang^2,3,
GU Jinchuan⁴,
XUE Jia^2,3,
WU Yi^2,3,
YONG Yi^{2,3
,
,}

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

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.
- modified bentonite,
- soil heavy metals,
- synchronous passivation,
- passivation mechanism

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References(29)

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