Magnetic separation of hematite-coated Fe3O4 particles used as arsenic adsorbents

Simeonidis, K.; Gkinis, Th.; Tresintsi, Sofia; Martínez-Boubeta, C.; Vourlias, G.; Tsiaoussis, I.; Stavropoulos, George; Mitrakas, Manassis; Angelakeris, M.

doi:10.1016/j.cej.2011.01.074

Cited by 108 publications

(41 citation statements)

References 30 publications

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“…Furthermore, the maximum arsenic adsorption capacity derived from both the Langmuir and Sips models were rather consistent. These values (2.3-2.4 mg As(V)/g MGCNs) were higher than those of previously reported for nanoparticle adsorbents such as hematite coated Fe 3 O 4 particles (2.1 mg/g), 11 commercial nanomagnetite (0.20 mg/g), 16 and magnetite nanoparticles supported on Fe-hydrotalcite (1.3 mg/g). 17 The Freundlich isotherm provides an "n" value that is related with adsorption intensity.…”

Section: Resultscontrasting

confidence: 48%

“…Some of the representative examples of these types of compounds are Fe 3 O 4 @NiO hierarchical nanostructures, 8 ordered meso-porous carbon encapsulating a wide range of metal oxide nanoparticles, 9 Fe 3 O 4 and Fe 2 O 3 obtained through a precipitation method, 10 and mechanically ball-milled Fe 3 O 4 nanopowder. 11 Many methods have been developed to increase the size of magnetite nanoparticles, which would result in a fast response to the external magnetic field particles, while keeping them stably dispersed in solution. To this end, it is sometimes misunderstood that large-sized superpara-magnetic nanoparticles having negligible remanence (residual magnetism) and coercivity (the field required to reduce magnetization to zero) at room temperature is the most effective material.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Removal of Arsenic Using Magnetic Multi-Granule Nanoclusters

Lee¹,

Cha²,

Sim³

et al. 2014

Bulletin of the Korean Chemical Society

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Magnetic multi-granule nanoclusters (MGNCs) were investigated as an inexpensive means to effectively remove arsenic from aqueous environment, particularly groundwater sources consumed by humans. Various size MGNCs were examined to determine both their capacity and efficiency for arsenic adsorption for different initial arsenic concentrations. The MGNCs showed highly efficient arsenic adsorption characteristics, thereby meeting the allowable safety limit of 10 g/L (ppb), prescribed by the World Health Organization (WHO), and confirming that 0.4 g and 0.6 g of MGNCs were sufficient to remove 0.5 mg/L and 1.0 mg/L of arsenate (AsO4 3 ) from water, respectively. Adsorption isotherm models for the MGNCs were used to estimate the adsorption parameters. They showed similar parameters for both the Langmuir and Sips models, confirming that the adsorption process in this work was active at a region of low arsenic concentration. The actual efficiency of arsenate removal was then tested against 1 L of artificial arsenic-contaminated groundwater with an arsenic concentration of 0.6 mg/L in the presence of competing ions. In this case, only 1.0 g of 100 nm MGNCs was sufficient to reduce the arsenic concentrations to below the WHO permissible safety limit for drinking water, without adjusting the pH or temperature, which is highly advantageous for practical field applications.

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Section: Resultscontrasting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Arsenic Using Magnetic Multi-Granule Nanoclusters

Lee¹,

Cha²,

Sim³

et al. 2014

Bulletin of the Korean Chemical Society

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“…Recently, numerous researches have focused on adsorptive arsenic removal, in which iron oxide was considered to be an appropriate adsorbent due to its high affinity [1][2][3][4][5][6][7]. However, the As(III) adsorption is less effective than the As(V) adsorption by adsorbents in natural water.…”

Section: Introductionmentioning

confidence: 99%

“…Manganese oxides have been extensively investigated as oxidizing agents for arsenite; the reaction is written as follows [8][9][10] Accordingly, a novel binary oxide concept in which the Mn-O catalyzed the As(III) pre-oxidation to As(V) and the Fe-O functioned as adsorbent, was therefore proposed [11,12]. To our knowledge, the Mn-Fe binary oxide materials was easily prepared by the co-precipitation methods, where the Mn reduction by ferrous is dependent on the solution pH [12,13] 3 (s) + MnO 2 (s) + H + However, the powder product of micrometers in size was difficul for solid-liquid separation. Based on the perspective of Mn-Fe binary oxide for arsenic removal, this study applied a millimeter scale iron oxide (BT-3) as support and aims at the synthesis of manganese oxides on its surface through the redox of potassium permanganate + in a fluidized bed reactor (FBR).…”

Section: Introductionmentioning

confidence: 99%

Reduction and Immobilization of Potassium Permanganate on Iron Oxide Catalyst by Fluidized-Bed Crystallization Technology

Huaug

Chen

et al. 2012

Applied Sciences

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A manganese immobilization technology in a fluidized-bed reactor (FBR) was developed by using a waste iron oxide (i.e., BT-3) as catalyst which is a by-product from the fluidized-bed Fenton reaction (FBR-Fenton). It was found that BT-3 could easily reduce potassium permanganate (KMnO 4 ) to MnO 2 . Furthermore, MnO 2 could accumulate on the surface of BT-3 catalyst to form a new Fe-Mn oxide. Laboratory experiments were carried out to investigate the KMnO 4 -reduction mechanism, including the effect of KMnO 4 concentration, BT-3 dosage, and operational solution pH. The results showed that the pH solution was a significant factor in the reduction of KMnO 4 . At the optimum level, pH f 6, KMnO 4 was virtually reduced in 10 min. A pseudo-first order reaction was employed to describe the reduction rate of KMnO 4 .

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“…Ball milling is proposed as an alternative solvent-free method for the preparation of iron oxide particles but a surfactant is necessary for iron oxide nanoparticles. 8) The electrical wire explosion (EWE) method has been performed for the synthesis of non-metal nanoparticles using pure metal wire and gas in an explosion chamber.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Phases in Nanoparticles Produced by Electrical Wire Explosion on Arsenic(III) Removal

Song

Suh

et al. 2012

Mater. Trans.

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Nano-sized iron oxide particles were prepared by electrical wire explosion (EWE) for As(III) removal. The electrical explosion of Fe wire in Ar5%O 2 , Ar10%O 2 , and Ar30%O 2 produced a wide spectrum of ironoxide phases from wüstite to hematite depending on the oxygen partial pressure in the chamber. An increase in oxygen partial pressure tended to shift the iron oxides towards higher oxidation states. The major phase of the explosion product was verified as the magnetite (Fe 3 O 4 )maghemite (£-Fe 2 O 3 ) mixture through the step scan of (511) and (440) peaks. The As(III) removal capacity and saturation magnetization were found to be proportional to the amount of zero-valent iron (ZVI) in the particles. The As(III) adsorption capacity (q max , mg/g) calculated from the Langmuir isotherm was 19.7, 9.46, and 3.55 mg/g for particles synthesized in Ar5%O 2 , Ar10%O 2 , and Ar30%O 2 , respectively. The EWE process could be utilized to produce nano-sized adsorbent particles with a wide range of As(III) removal capability simply by varying the gas mixture. The eco-friendly nature of EWE process combined with the magnetic separation option would add to the list of the successful As(III) removal adsorbents.

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Magnetic separation of hematite-coated Fe3O4 particles used as arsenic adsorbents

Cited by 108 publications

References 30 publications

Efficient Removal of Arsenic Using Magnetic Multi-Granule Nanoclusters

Efficient Removal of Arsenic Using Magnetic Multi-Granule Nanoclusters

Reduction and Immobilization of Potassium Permanganate on Iron Oxide Catalyst by Fluidized-Bed Crystallization Technology

The Effect of Phases in Nanoparticles Produced by Electrical Wire Explosion on Arsenic(III) Removal

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