EFFECT OF PHASE TRANSFORMATION OF NANO-ZERO-VALENT IRON ON STABILIZATION AND POTENTIAL TOXICITY OF ARSENIC IN CONTAMINATED SOIL

LV Zijuan; WANG Huawei; WU Yajing; SUN Yingjie; WANG Yanan

doi:10.13205/j.hjgc.202203005

Volume 40 Issue 3

Mar. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(3): 24-31

LV Zijuan, WANG Huawei, WU Yajing, SUN Yingjie, WANG Yanan. EFFECT OF PHASE TRANSFORMATION OF NANO-ZERO-VALENT IRON ON STABILIZATION AND POTENTIAL TOXICITY OF ARSENIC IN CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(3): 24-31. doi: 10.13205/j.hjgc.202203005

Citation:

LV Zijuan, WANG Huawei, WU Yajing, SUN Yingjie, WANG Yanan. EFFECT OF PHASE TRANSFORMATION OF NANO-ZERO-VALENT IRON ON STABILIZATION AND POTENTIAL TOXICITY OF ARSENIC IN CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(3): 24-31. doi: 10.13205/j.hjgc.202203005

Citation:

LV Zijuan, WANG Huawei, WU Yajing, SUN Yingjie, WANG Yanan. EFFECT OF PHASE TRANSFORMATION OF NANO-ZERO-VALENT IRON ON STABILIZATION AND POTENTIAL TOXICITY OF ARSENIC IN CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(3): 24-31. doi: 10.13205/j.hjgc.202203005

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EFFECT OF PHASE TRANSFORMATION OF NANO-ZERO-VALENT IRON ON STABILIZATION AND POTENTIAL TOXICITY OF ARSENIC IN CONTAMINATED SOIL

doi: 10.13205/j.hjgc.202203005

Qingdao Solid Waste Pollution Control and Resource Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China

Received Date: 2021-03-03
Available Online: 2022-07-07

Abstract

Abstract

In order to explore the effect of nano-zero-valent iron agglomeration and oxidation reaction on the stabilization effect and potential toxicity of arsenic (As) in soil, nano-zero-valent iron and its possible phase-transition products, including micro-zero-valent iron, nano-Fe₂O₃, micro-Fe₂O₃ and nano-Fe₃O₄ were selected, and the effect of phase transition of nano-zero-valent iron on the stabilization effect and potential toxicity of As-contaminated soils were studied. The results showed that:1) in comparison, nano-zero-valent iron had the best efficiency for As stabilization in the soil, and the water-soluble As content decreased from 2.20 mg/kg to 0.11 mg/kg, the stabilization efficiency was 94.90% when its addition amount was 5%. At the same time, the environmental analysis of As decreased from the medium risk to no risk level; 2) based on results of leaching experiments, it was found that the agglomeration of nano-zero valent iron to micro-zero-valent iron had no significant on the stabilization efficiency of As (P>0.05); 3) the phytotoxicity experiments indicated that the aggregation and oxidation products of nano-zero-valent iron could inhibit the growth of roots and affect the relative root length of rapeseed seeds, however, it had no inhibitory effect on relative seed germination rate and seed germination index; 4) according to morphological analysis, phytotoxicity and environmental risk analysis, we found that micro-Fe₂O₃ and nano-Fe₃O₄ had low efficiency for As stabilization in soils, certain environmental risks remained after stabilization treatment. Therefore, in the actual remediation process, the environmental risk of As induced by the phase transition of nano-zero-valent iron needs attention.
- nano-zero-valent iron,
- agglomeration oxidation,
- arsenic pollution,
- phytotoxicity,
- environmental risk

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References(23)

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