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Journal Articles

Cesium adsorption ability and stability of metal hexacyanoferrates irradiated with $$gamma$$-rays

Arisaka, Makoto; Watanabe, Masayuki; Ishizaki, Manabu*; Kurihara, Masato*; Chen, R.*; Tanaka, Hisashi*

Journal of Radioanalytical and Nuclear Chemistry, 303(2), p.1543 - 1547, 2015/02

 Times Cited Count:12 Percentile:70.84(Chemistry, Analytical)

The influence of irradiation with $$gamma$$-rays to metal hexacyanoferrate (MHCF: M = Fe, Cu or Ni), which is known as an adsorbent for selective adsorption of cesium (Cs) ion in solution, on Cs adsorption ability and stability was investigated in HNO$$_{3}$$ solutions. Under the adsorbed dose conditions (50-300 kGy), it was found that the MHCF is fully stable although the radiolytic decomposition of MHCF was slightly observed with an increase of the total adsorbed dose, which was confirmed by an increment of Fe, Cu or Ni concentration in HNO$$_{3}$$ solution after the irradiation. The weight percent of the metal in the solution to initial weight of MHCF was less than unity. Moreover, no change in composition of carbon, hydrogen and nitrogen in MHCF was observed. On the other hand, the distribution coefficients of Cs to the irradiated MHCF were independent of the total adsorbed dose. This indicates that the Cs adsorption ability was maintained under $$gamma$$-ray irradiation.

Journal Articles

Proton-exchange mechanism of specific Cs$$^{+}$$ adsorption $$via$$ lattice defect sites of Prussian blue filled with coordination and crystallization water molecules

Ishizaki, Manabu*; Akiba, Sae*; Otani, Asako*; Hoshi, Yuji*; Ono, Kenta*; Matsuba, Mayu*; Togashi, Takanari*; Kanaizuka, Katsuhiko*; Sakamoto, Masatomi*; Takahashi, Akira*; et al.

Dalton Transactions, 42(45), p.16049 - 16055, 2013/12

 Times Cited Count:165 Percentile:99.56(Chemistry, Inorganic & Nuclear)

We have revealed the fundamental mechanism of specific Cs$$^{+}$$ adsorption into Prussian blue (PB) in order to develop high-performance PB-based Cs$$^{+}$$ adsorbents in the wake of the Fukushima nuclear accident. We compared two types of PB nanoparticles with formulae of Fe$$^{III}$$$$_{4}$$[Fe$$^{II}$$(CN)$$_{6}$$]3$$cdot$$xH$$_{2}$$O (x = 10-15) (PB-1) and (NH$$_{4}$$)0.70Fe$$^{III}$$1.10[Fe$$^{II}$$(CN)$$_{6}$$]$$cdot$$1.7H$$_{2}$$O (PB-2) with respect to the Cs$$^{+}$$ adsorption ability. The synthesised PB-1, by a common stoichiometric aqueous reaction between 4Fe$$^{3+}$$ and 3[Fe$$^{II}$$(CN)$$_{6}$$]$$^{4-}$$, showed much more efficient Cs$$^{+}$$ adsorption ability than did the commercially available PB-2.

Oral presentation

Partial improvement of helium compressor V-ring device in JRR-3

Ishizaki, Katsuhiko; Ota, Kazunori; Takeuchi, Masaki; Imahashi, Masaki; Fukushima, Manabu

no journal, , 

no abstracts in English

Oral presentation

Radiolytic stability of metal hexacyanoferrate as adsorbent for recovery of cesium ion

Arisaka, Makoto; Watanabe, Masayuki; Ishizaki, Manabu*; Kurihara, Masato*; Chen, R.*; Tanaka, Hisashi*

no journal, , 

The influence of irradiation with $$gamma$$-rays to MHCF on stability and Cs adsorption ability in HNO$$_{3}$$ solutions was investigated. First, the radiolytic degradation of MHCF was evaluated by determination of the amount of M (= Fe, Cu) in HNO$$_{3}$$ solution, which is separated from the sample by filtration after $$gamma$$-ray irradiation. The amount of Fe and Cu in the solutions to initial weight of MHCF increased slightly with an increase of the total absorbed dose. Under the condition in this study, the weight percent of Fe and Cu in the solutions to initial weight of MHCF was less than 0.05%. Moreover, the composition of carbon, nitrogen and hydrogen in MHCF is constant independent of the total absorbed dose. The adsorption experiment for Cs was performed using the irradiated MHCF as the adsorbent. The distribution coefficients of Cs onto MHCF were constant independent of the total absorbed dose. From the viewpoint of usage for a long period, it suggests that the MHCF is fully stable.

Oral presentation

Influence of coexisting ions to cesium adsorption electrode of nanoparticle copper hexacyanoferrate

Tanaka, Hisashi*; Chen, R.*; Asai, Miyuki*; Fukushima, Chikako*; Kawamoto, Toru*; Ishizaki, Manabu*; Kurihara, Masato*; Arisaka, Makoto; Nankawa, Takuya; Watanabe, Masayuki

no journal, , 

Hexacyanoferrate metal Complex (MHCF) is well-known as adsorption materials for Cesium ion. We have developed the effective processing method by making MHCF of nano particle ink. In this paper, we investigated the effect of the presence of other metal cations on electrochemical adsorption and desorption of cesium.

Oral presentation

Compact Cs separation by electrochemical adsorption/desorption using copper hexacyanoferrate film in a column system

Chen, R.*; Tanaka, Hisashi*; Fukushima, Chikako*; Asai, Miyuki*; Kawamoto, Toru*; Kurihara, Masato*; Ishizaki, Manabu*; Arisaka, Makoto; Nankawa, Takuya; Watanabe, Masayuki

no journal, , 

Transition metal hexacyanoferrates (MHCFs) are preferred to be competitive ion exchangers over other materials due to their selectivity and high capacity. CuHCF$$^{III}$$ has been much used as precipitants for alkali metal cations, especially cesium, to remove them from aqueous radioactive wastes. Instated of the conventional adsorption by using copper hexacyanoferrate powder, we developed and coated the CuHCF$$^{III}$$ nanoparticles on the electrode substance, and then performed Cs removal in an electrochemical column System. The objective of this study was to develop a nanoparticle film of CuHCF$$^{III}$$ for Cs removal and to suggest a promising column technology for sequential removal of actual radiocesium wastewater.

Oral presentation

Radiolytic stability of metal hexacyanoferrate film as adsorbent for recovery of cesium ion

Arisaka, Makoto; Watanabe, Masayuki; Ishizaki, Manabu*; Kurihara, Masato*; Chen, R.*; Tanaka, Hisashi*

no journal, , 

Recently, we reported an electrochemical application of MHCF (M = Fe, Cu or Ni) film for Cs recovery from nitric acid (HNO$$_{3}$$) solutions. It was found that Cs loading and unloading can be easily controlled by modulating the film potential. In this study, the influence of irradiation with $$gamma$$-rays to MHCF films on stability in HNO$$_{3}$$ solutions was investigated.

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