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Journal Articles

Removal of cesium ions from contaminated seawater in closed area using adsorptive fiber

Someya, Takaaki*; Asai, Shiho; Fujiwara, Kunio*; Sugo, Takanobu*; Umeno, Daisuke*; Saito, Kyoichi*

Nihon Kaisui Gakkai-Shi, 69(1), p.42 - 48, 2015/02

A large amount of seriously contaminated sea water with radioactive Cs has been reserved in semi-enclosed coastal sea area which is separated by silt fences and embankments. Insoluble cobalt ferrocyanide (Co-FC) microparticles-impregnated fiber was developed for removing Cs from the contaminated sea water. The resultant Co-FC-impregnated fiber was immersed in either nonradioactive or radioactive Cs solution. The adsorption isotherm well correlated with a Langmuir-type equation. In addition, mass-transfer capacity coefficients were determined by fitting the experimental data of the rate of Cs adsorption onto the Co-FC-impregnated fiber to theoretical adsorption curves based on the Cs concentration difference between the bulk and the interface in seawater as a driving force of the overall adsorption rate. Decontamination factors as functions of fiber weight and the contact time required for the removal of cesium ions from the contaminated seawater in a closed area were estimated.

Journal Articles

Simple method for high-density impregnation of Aliquat 336 onto porous sheet and binding performance of resulting sheet for palladium ions

Tanaka, Ryota*; Ishihara, Ryo*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*; Asai, Shiho; Yamada, Shinsuke*; Hirota, Hideyuki*

Separation Science and Technology, 49(1), p.154 - 159, 2014/01

 Times Cited Count:4 Percentile:19.55(Chemistry, Multidisciplinary)

Journal Articles

Determination of mole percentages of brush and root of polymer chain grafted onto porous sheet

Uchiyama, Shoichiro*; Ishihara, Ryo*; Umeno, Daisuke*; Saito, Kyoichi*; Yamada, Shinsuke*; Hirota, Hideyuki*; Asai, Shiho

Journal of Chemical Engineering of Japan, 46(6), p.414 - 419, 2013/06

 Times Cited Count:7 Percentile:30.41(Engineering, Chemical)

Journal Articles

Crosslinked-chelating porous sheet with high dynamic binding capacity of metal ions

Wada, Go*; Ishihara, Ryo*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*; Asai, Shiho; Yamada, Shinsuke*; Hirota, Hideyuki*

Solvent Extraction and Ion Exchange, 31(2), p.210 - 220, 2013/02

 Times Cited Count:2 Percentile:13.98(Chemistry, Multidisciplinary)

A crosslinked chelating porous sheet was prepared by cografting ethylene glycol dimethacrylate (EGDMA) with glycidyl methacrylate onto an electron-beam-irradiated porous polyethylene sheet, followed by the introduction of an iminodiacetate group. At a molar percentage of EGDMA of 1.0 mol%, the sheet exhibited a maximum dynamic binding capacity for copper ions of 0.93 mmol/g, while the equilibrium binding capacity remained the same (1.2 mmol/g) as that of a non-crosslinked chelating porous sheet. The crosslinking of the grafted chain causes copper ions to lower their diffusion rate along the sheet thickness driven by the gradient of the amount of copper ions adsorbed.

Journal Articles

Dependence of lanthanide-ion binding performance on HDEHP concentration in HDEHP impregnation to porous sheet

Ishihara, Ryo*; Asai, Shiho; Otosaka, Shigeyoshi; Yamada, Shinsuke*; Hirota, Hideyuki*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*

Solvent Extraction and Ion Exchange, 30(2), p.171 - 180, 2012/02

 Times Cited Count:6 Percentile:28.68(Chemistry, Multidisciplinary)

Journal Articles

Removal of cesium using cobalt-ferrocyanide-impregnated polymer-chain-grafted fibers

Ishihara, Ryo*; Fujiwara, Kunio*; Harayama, Takato*; Okamura, Yusuke*; Uchiyama, Shoichiro*; Sugiyama, Mai*; Someya, Takaaki*; Amakai, Wataru*; Umino, Satoshi*; Ono, Tsubasa*; et al.

Journal of Nuclear Science and Technology, 48(10), p.1281 - 1284, 2011/10

AA2011-0190.pdf:0.45MB

 Times Cited Count:41 Percentile:95.7(Nuclear Science & Technology)

Journal Articles

Effect of chelating group density of crosslinked graft chain on dynamic binding capacity for metal ions

Wada, Go*; Ishihara, Ryo*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*; Asai, Shiho; Yamada, Shinsuke*; Hirota, Hideyuki*

Nihon Ion Kokan Gakkai-Shi, 22(2), p.47 - 52, 2011/01

no abstracts in English

Journal Articles

Development of novel ion-exchange membranes for electrodialysis of seawater by electron-beam-induced graft polymerization, 4; Polymeric structures of cation-exchange membranes based on nylon-6 film

Miyazawa, Tadashi*; Asari, Yuki*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*; Nagatani, Takeshi*; Yoshikawa, Naohito*; Motokawa, Ryuhei; Koizumi, Satoshi*

Nihon Kaisui Gakkai-Shi, 64(6), p.360 - 365, 2010/12

Journal Articles

Modification of a hydrophobic-ligand-containing porous sheet using tri-$$n$$-octylphosphine oxide, and its adsorption/elution of bismuth ions

Tanaka, Ryota*; Ishihara, Ryo*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*; Asai, Shiho; Yamada, Shinsuke*; Hirota, Hideyuki*

Reactive and Functional Polymers, 70(12), p.986 - 990, 2010/12

 Times Cited Count:7 Percentile:31.92(Chemistry, Applied)

Journal Articles

Preparation of extractant-impregnated porous sheets for high-speed separation of radionuclides

Ishihara, Ryo*; Umeno, Daisuke*; Saito, Kyoichi*; Asai, Shiho; Sakurai, Satoshi; Shinohara, Nobuo; Sugo, Takanobu*

Nihon Ion Kokan Gakkai-Shi, 18(4), p.480 - 485, 2007/10

Oral presentation

Preparation of extractant-impregnated porous sheet for high-speed separation of metal ion

Ishihara, Ryo*; Asai, Shiho; Yamashiro, Kohei*; Umeno, Daisuke*; Saito, Kyoichi*; Sugo, Takanobu*

no journal, , 

no abstracts in English

Oral presentation

Preparation of ampholite-immobilized interface by radiation-induced grafting

Iwanade, Akio*; Umeno, Daisuke*; Saito, Kyoichi*; Katakai, Akio; Tamada, Masao

no journal, , 

no abstracts in English

Oral presentation

Preparation of extractant-impregnated porous sheet for preconcentration of rare earth elements

Ishihara, Ryo*; Asai, Shiho; Sakurai, Satoshi; Shinohara, Nobuo; Umeno, Daisuke*; Saito, Kyoichi*; Sugo, Takanobu*

no journal, , 

no abstracts in English

Oral presentation

Preparation of access-restricted separation material for analysis of bio-samples

Shibahara, Ryuji*; Asai, Shiho; Hagiwara, Kyohei*; Takami, Michiko*; Shiraishi, Kunio*; Umeno, Daisuke*; Shinohara, Nobuo; Sugo, Takanobu*; Saito, Kyoichi*

no journal, , 

no abstracts in English

Oral presentation

High-speed recovery of metal ions using extractant-impregnated porous sheet

Tanaka, Ryota*; Asai, Shiho; Ishihara, Ryo*; Umeno, Daisuke*; Saito, Kyoichi*; Shinohara, Nobuo

no journal, , 

no abstracts in English

Oral presentation

Impregnation of Aliquat 336 to carboxydecanyl-thiol-group-containing polymer chain grafted onto a porous sheet

Tanaka, Ryota*; Ishihara, Ryo*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*; Asai, Shiho; Yamada, Shinsuke*; Hirota, Hideyuki*

no journal, , 

A basic extractant Aliquat 336 dissolved in a mixture of ethanol and NaOH aqueous solution was impregnated to carboxydecanyl-thiol (CDT) group containing polymer chains grafted onto a porous sheet. The CDT group was introduced into the graft chain by a reaction of the epoxy group of poly-glycidyl methacrylate (GMA) chain grafted onto the porous sheet with 11-mercaptoundecanoic acid. The electrostatic interaction between the carboxyl moiety of the CDT group and the quaternary ammonium group of Aliquat 336 gave rise to a high-density impregnation of Aliquat 336. Palladium chloride (50 mg-Pd/L) in 1 M HCl was forced to permeate through the pores of the Aliquat 336-impregnated porous sheet. The binding efficiency, defined as the ratio of number of moles of palladium adsorbed to half the number of moles of impregnated Aliquat 336, was found to be 64%.

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