Mechanism of δ-FeOOH Formation by Oxygen Oxidizing Fe(OH)2 Suspension with EDTA Used as Cofactor

Abstract

Abstract: At room temperature and in the presence of trace EDTA, the formation of δ-FeOOH was studied by the rapid oxidation of Fe(OH)₂ suspension with O₂. The structural and morphological changes were characterized by various techniques such as XRD, FTIR and TEM. γ-FeOOH and (δ-FeOOH) formed simutaneously in the early period of oxidation. But as the rate of mass transfer was in equilibrium, trace (γ-FeOOH) vanished gradually. Accordingly, pure phase δ-FeOOH was obtained. At the same time, critical amount ratio K of EDTA to Fe^²⁺ was verified. The experiments show that the reactivity, rate of the oxidizing agent and pH of the initial medium were important factors for the formation of pure phase (δ-FeOOH). Under the auxiliary effect of EDTA, the reactivity of O₂ was nearly improved to that of H₂O₂. And the process of the oxidation that Fe(OH)₂ suspension was oxidized by O₂ under that condition was discussed.

Key words: δ-FeOOH, EDTA, Fe(OH)₂, Oxidation

CLC Number:

O614

TrendMD:

WEI Yu, MENG Zhe, JIA Zhen-Bin, MA Zi-Chuan . Mechanism of δ-FeOOH Formation by Oxygen Oxidizing Fe(OH)₂ Suspension with EDTA Used as Cofactor[J]. Chem. J. Chinese Universities, 2005, 26(5): 945.

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Mechanism of δ-FeOOH Formation by Oxygen Oxidizing Fe(OH)₂ Suspension with EDTA Used as Cofactor

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