Abstract
ABSTRACT Finding an efficient method, which may decrease the pollution of soil by heavy metals, is of significance. It has been rarely determined that nano-iron particles (Fe), can contribute to the efficient removal of heavy metals from the soil under different temperature and moisture conditions. Accordingly, the objective of the present research was to investigate the effects of Fe including zero-valent iron (nZVI = Fe0) and magnetite (nFe3O4 = Fe1), at 0.5 (N1), 1.0 (N2) and 2.0% (N3) on Cr removal from a contaminated soil affected by different times (24 (T1), 48 (T2) and 72 h (T3)), temperatures (15 (Te1), 25 (Te2) and 35°C (Te3)) and moisture treatments (saturated (M1), 60 (M2), and 100% (M3) of field capacity). According to the analysis of variance the experimental treatments (Fe, N, Te and M) and their interactions (Fe*N; Fe*N*Te and Fe*T*M) significantly affected Cr removal from the contaminated soil. The results indicated, for both nano sources, N1 was the most effective treatment on Cr removal, followed by N2 and N3. The significant differences between the two nano sources affecting Cr removal from the soil was marginal (P = .0513). The significant interaction of Fe*N indicates the effects of the nano sources on Cr removal may be different at each N rate. Temperature also significantly affected Cr removal from the contaminated soil as its single and its interaction effects with the rate (N) and source of nano (Fe) were significant. Te1 and Te3, compared with Te2, and M2 and M3, compared with M1, were the most efficient ones for Cr removal. Although time single effect was not significant on Cr removal, its interaction with nano source and moisture was significant indicating a longer time and moisture level may affect the efficiency of Cr removal from the contaminated soil by Fe nano sources.
Published Version
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