Extent and mechanism of metal ion incorporation into precipitated ferrites

Klas, Sivan; Dubowski, Yael; Pritosiwi, Gumelar; Gerth, Joachim; Calmano, Wolfgang; Lahav, Ori

doi:10.1016/j.jcis.2011.02.046

Cited by 10 publications

(1 citation statement)

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“…The results showed that negligible amounts of Fe (0.002-0.05%) and Nb (0.01-0.05%) remained unreacted, while in the case of Mo, it was very high (6-46%), which showed that the incorporation maxima of Mo into magnetite was much less than Nb. The maxima incorporation value for number of transition metals from the fourth row of the periodic table 29 has been determined, but in the case of other transition metals has been poorly addressed in the literature. The generated oxygen vacancies in the samples were mainly from the cationic deciency in their structure and adjustments for structural dislocations.…”

Section: Characterization Of Fe 3àxày Nb X Mo Y O 4 Samplesmentioning

confidence: 99%

Effects of niobium and molybdenum impregnation on adsorption capacity and Fenton catalytic activity of magnetite

2015

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In the present study, a number of modified magnetite samples were prepared by impregnating magnetite with Nb and Mo (Fe 3-x-y Nb x Mo y O 4 , x + y = 0.2). The characteristics of the samples in terms of durability, crystalline phase, morphology, size, surface area and composition and magnetic property were determined. Subsequently, the effect of Nb and Mo incorporation on adsorption capacity of magnetite and its activity in heterogeneous Fenton oxidation of methylene blue was investigated. The amount of MB adsorbed on the synthetized samples increased considerably mainly due to the increase in their specific surface area. In addition, the presence of Nb and Mo significantly improved degradation of MB, especially at higher contents of Nb+Mo.About 90% of MB (100 mg L −1 ) and 46% of TOC were removed under the studied condition.MB adsorption and Fenton degradation using synthetized samples were well described by pseudo-second-order and pseudo-first-order equations in kinetics, respectively. The samples demonstrated a good durability and insignificant loss of performance in three consecutive experiments. The obtained results verified that Nb and Mo co-incorporation could effectively improve magnetite properties towards higher adsorption and remarkable activity in heterogeneous Fenton process at neutral condition.

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Section: Characterization Of Fe 3àxày Nb X Mo Y O 4 Samplesmentioning

confidence: 99%