Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 686, Issue -, Pages 476-483Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.05.330
Keywords
Nano zero-valent iron; Attapulgite clay; Immobilization; Heavy metals; Pakchoi
Categories
Funding
- National Natural Science Foundation of China [41877133, 41701367]
- National Key Research and Development Program of China [2017YFD0801503]
- Fundamental Research Funds for the Central Universities [PT1906]
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Nowadays, the problem of heavy metal pollution in vegetables is received wide attention. In this work, attapulgite clay (ATTP), as a cheap and readily available inorganic mineral material, was modified with nano zero-valent iron (nFe(0)@ATTP) for heavy metal immobilization in soil. Batch experiments were employed to evaluate the optimal remediation performance by ATTP before and after modified with nFe(0) through planting Pakchoi (Brassica chinesis L) in Cd, Cr, and Pb contaminated soil from Changsha. The results showed that amendments can all increase the pH value of soils, and notably decrease the concentration of extractable Cd, Cr, and Pb in soil. The germination rate and root length of Pakchoi were promoted, and the activities of peroxidase (POD), catalase (CAT), and malondialdehyde (MDA) contents were notably reduced besides superoxide dismutase (SOD) activity after treatments with ATTP and nFe(0)@ATTP. Viciafaba-rnicronucleus test indicated that the application of amendments reduced the toxicity of heavy metals on the genetic material of Vicia faba root tip cells. The nFe(0)@ATTP were found to well convert Cd, Cr, and Pb into less bioavailable state in soil, thus blocking heavy metal uptake by plants. This material could be a promising amendment for heavy metals contaminated soil. (C) 2019 Published by Elsevier B.V.
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