Inorganic-Organic Magnetic Nanocomposites for use in Preventive Medicine: A Rapid and Reliable Elimination System for Cesium

Namiki, Yoshihisa; Namiki, Tamami; Ishii, Yudo; Koido, Shigeo; Nagase, Yuki; Tsubota, Akihito; Tada, Norio; Kitamoto, Yoshitaka

doi:10.1007/s11095-011-0628-x

Cited by 59 publications

(17 citation statements)

References 36 publications

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“…Especially, the radioactive wastes, appearing from the power nuclear reactors and the application of radionuclides such as medicine, agricultures, industry and research are a major concern to human health if they enter the environment. Since the major nuclear accident at Fukushima, Japan in 2011, 630,000-777,000 TBq (tetrabecquerels) of radioactive nuclides such as Sr, Se, I and Cs were released into water, soil and air [1,2]. Among radionuclides, 137 Cs has a long half-life of (t 1/2 =30.17 years) and poses serious environmental threat because of its high solubility and mobility with aqueous media in the subsurface [3].…”

Section: Introductionmentioning

confidence: 99%

Removal of cesium ions from waste solution using sericite incorporated into nickel hexacyanoferrate

Jeon

Cha

2015

Korean J. Chem. Eng.

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To increase adsorption capacity and selectivity for cesium ions from waste solution, sericite was chemically modified by means of nickel hexacyanoferrate (NiHCF) with a high selectivity trap agent for cesium. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy were used for the characteristic analysis of surface onto the NiHCF-sericite. The adsorption capacity of cesium ions for the NiHCF-sericite increased about 2.5 times, as compared with natural sericite at initial pH 5.0 of waste solution. Adsorption equilibrium was investigated by Langmuir and Freundlich isotherm model, respectively. Maximum adsorption capacity was estimated as 16.583 mg/g, and the Langmuir isotherm fits the adsorption data better than Freundlich model. The adsorption process was determined as an exothermic reaction and all adsorption was completed in 30 min. In addition, the adsorption capacity of cesium ions was not greatly affected by ionic strength (~0.1 M NaCl concentration) and other metals in mixed waste solution.

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Section: Introductionmentioning

confidence: 99%

Removal of cesium ions from waste solution using sericite incorporated into nickel hexacyanoferrate

Jeon

Cha

2015

Korean J. Chem. Eng.

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“…Initially, to eliminate radioactive cesium from the fly ash slurry, we tested the applicability of the previously developed Prussian blue-coated iron oxide nanoparticles (PB-IO) that we had used to effectively remove cesium from seawater6. PB-IO (40 mg) was able to eliminate 95.4% of radioactive cesium from 400 mL of the solid-liquid-separated supernatant (828.45 Bq/kg) of the fly ash slurry after neutralization (pH 7.0); however, after direct mixing with fly ash slurry (fly ash: 40 g; DW: 400 mL), PB-IO (2 g) and the fly ash particles became strongly bonded with one another, and their magnetic separation was difficult.…”

Section: Resultsmentioning

confidence: 99%

Hybrid micro-particles as a magnetically-guidable decontaminant for cesium-eluted ash slurry

Namiki

Ueyama²,

Yoshida³

et al. 2014

Sci Rep

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Decontamination of the radioactive cesium that is widely dispersed owing to a nuclear power station accident and concentrated in fly ash requires an effective elimination system. Radioactive fly ash contains large amounts of water-soluble cesium that can cause severe secondary contamination and represents a serious health risk, yet its complete removal is complicated and difficult. Here it is shown that a new fine-powder formulation can be magnetically guided to eliminate cesium after being mixed with the ash slurry. This formulation, termed MagCE, consists of a ferromagnetic porous structure and alkaline- and salt-resistant nickel ferrocyanide. It has potent cesium-adsorption- and magnetic-separation-properties. Because of its resistance against physical and chemical attack such as with ash particles, as well as with the high pH and salt concentration of the ash slurry, MagCE simplifies the decontamination process without the need of the continued presence of the hazardous water-soluble cesium in the treated ash.

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“…Initially magnetic nanoparticles were modified with cationic polymer, poly (diaryldimethylammonium chloride) (PDDA). Then anionic Prussian blue was bound to PDDA-modified magnetic nanoparticles and Prussian blue-coated magnetic nanoparticles were obtained (7). Sequentially, using the combination of this magnetic nanoparticles and neodymium magnets, we have investigated the degree of magnetic elimination of contaminated cesium from sea water, serum, milk and fly ashes.…”

Section: Methodsmentioning

confidence: 99%

Rapid and Reliable Elimination System for Radioactive Cesium Using Magnetic Nanocomposites

Namiki

2014

J. Jpn. Soc. Powder Powder Metallurgy

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We have devised the rapid elimination system for the contaminated radioactive cesium using magnetic nanocomposites. The Great East Japan Earthquake hit caused a serious meltdown of the overheated fuel rods and the release of radioactive chemicals into the environment. Until now, fuel rods have been cooled using seawater to control its temperature, therefore huge amount of waste water containing high concentrations of radioactive cesium have been continuously generated. On the other hand, radioactive cesium is easily condensed in the fly ash originating from incineration of garbage. The garbage incineration plant is overflowing with the fly ash which cannot be discarded (when the radioactivity of fly ash exceeds 8000 Bq/kg, we cannot discard it as a usual manner). Prussian blue is known as an effective eliminator of radioacitive cesium from seawater and fly ash slurry, however complete and rapid collection of Prussian blue dispersed in water is very difficult. Recently, we have developed a novel form of magnetically guidable Prussian blue coated magnetic nanocomposite clusters via the application of nanotechnology for drug delivery system. Using this type of nanocomposites under magnetic field, we have confirmed that 99.9% and over 80% of cesium were rapidly removed from seawater and fly ash, respectively.

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Inorganic-Organic Magnetic Nanocomposites for use in Preventive Medicine: A Rapid and Reliable Elimination System for Cesium

Abstract: Under a magnetic field, Prussian blueberry was able to rapidly eliminate cesium from seawater and from biological matrices such as serum and milk.

Cited by 59 publications

References 36 publications

Removal of cesium ions from waste solution using sericite incorporated into nickel hexacyanoferrate

Removal of cesium ions from waste solution using sericite incorporated into nickel hexacyanoferrate

Hybrid micro-particles as a magnetically-guidable decontaminant for cesium-eluted ash slurry

Rapid and Reliable Elimination System for Radioactive Cesium Using Magnetic Nanocomposites

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