Synthesis of layered double hydroxide/different carbon material and 90Sr2+ composites for simultaneous adsorption of 79 SeO 4 2-

Yuta Kamura, Paulmanickam Koilraj, Tsuyoshi Hirajima, Keiko Sasaki

Research output: Contribution to conferencePaper

Abstract

After the Fukushima Daiichi Nuclear Power Plant accident, a variety of radionuclides has been treated by Advanced Liquid Processing System including different adsorbents. This work aims to synthesize layered double hydroxide (LDH)/different carbon materials composites for simultaneous adsorption of radioactive anion and cation, where 79 SeO 4 2- and 90 Sr 2+ have been selected as targets for removal. As carbon materials, carbon-dot and graphene oxide (GO) were synthesized to modify LDH, in which the presence of carboxylic groups was confirmed by FTIR. TEM observation revealed the sizes of C-dot and LDH particles are 3-5 nm and around 100 nm, respectively, while the size of GO has been reported 1-2 mm. Simultaneous adsorption of SeO 4 2- and Sr 2+ was achieved in both composites using surrogates, though ion-exchange of SeO 4 2- with NO 3 - in LDH and complexation of Sr 2+ with carboxyl group in carbon materials. Comparable adsorption capacities of SeO 4 2- was observed on both composites. However, Sr 2+ adsorption capacities were much larger in LDH/GO than LDH/C-dot in any cases of different carbon contents. In addition, Sr 2+ adsorption capacities in mmol/g-GO were much larger in LDH/GO composites than pure GO. Zeta potential of LDH/GO was +31.0 mV closer to LDH, while that of LDH-C-dot was -16.4 mV closer to C-dot. These observation suggests there is a clear contrast between two composites. That is, the composite of LDH/GO consists of coverage of larger sheets of GO with smaller sheets of LDH, while the composite of LDH/C-dot consists of coverage of larger sheets of LDH with nano-sized C-dot. Accordingly it is promising to customize the ratio of LDH/GO in the composite considering the different radioactive waste water compositions to treat in various stages.

Original languageEnglish
Publication statusPublished - Jan 1 2017
Event14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 - Sapporo, Hokkaido, Japan
Duration: Sep 26 2017Sep 29 2017

Conference

Conference14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017
CountryJapan
CitySapporo, Hokkaido
Period9/26/179/29/17

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hydroxide
adsorption
carbon
oxide
material
nuclear power plant
complexation
radioactive waste
accident
radionuclide
transmission electron microscopy
anion
ion exchange
cation

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)

Cite this

Kamura, Y., Koilraj, P., Hirajima, T., & Sasaki, K. (2017). Synthesis of layered double hydroxide/different carbon material and 90Sr2+ composites for simultaneous adsorption of 79 SeO 4 2- . Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.

Synthesis of layered double hydroxide/different carbon material and 90Sr2+ composites for simultaneous adsorption of 79 SeO 4 2- . / Kamura, Yuta; Koilraj, Paulmanickam; Hirajima, Tsuyoshi; Sasaki, Keiko.

2017. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.

Research output: Contribution to conferencePaper

Kamura, Y, Koilraj, P, Hirajima, T & Sasaki, K 2017, ' Synthesis of layered double hydroxide/different carbon material and 90Sr2+ composites for simultaneous adsorption of 79 SeO 4 2- ' Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan, 9/26/17 - 9/29/17, .
Kamura Y, Koilraj P, Hirajima T, Sasaki K. Synthesis of layered double hydroxide/different carbon material and 90Sr2+ composites for simultaneous adsorption of 79 SeO 4 2- . 2017. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.
Kamura, Yuta ; Koilraj, Paulmanickam ; Hirajima, Tsuyoshi ; Sasaki, Keiko. / Synthesis of layered double hydroxide/different carbon material and 90Sr2+ composites for simultaneous adsorption of 79 SeO 4 2- Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.
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abstract = "After the Fukushima Daiichi Nuclear Power Plant accident, a variety of radionuclides has been treated by Advanced Liquid Processing System including different adsorbents. This work aims to synthesize layered double hydroxide (LDH)/different carbon materials composites for simultaneous adsorption of radioactive anion and cation, where 79 SeO 4 2- and 90 Sr 2+ have been selected as targets for removal. As carbon materials, carbon-dot and graphene oxide (GO) were synthesized to modify LDH, in which the presence of carboxylic groups was confirmed by FTIR. TEM observation revealed the sizes of C-dot and LDH particles are 3-5 nm and around 100 nm, respectively, while the size of GO has been reported 1-2 mm. Simultaneous adsorption of SeO 4 2- and Sr 2+ was achieved in both composites using surrogates, though ion-exchange of SeO 4 2- with NO 3 - in LDH and complexation of Sr 2+ with carboxyl group in carbon materials. Comparable adsorption capacities of SeO 4 2- was observed on both composites. However, Sr 2+ adsorption capacities were much larger in LDH/GO than LDH/C-dot in any cases of different carbon contents. In addition, Sr 2+ adsorption capacities in mmol/g-GO were much larger in LDH/GO composites than pure GO. Zeta potential of LDH/GO was +31.0 mV closer to LDH, while that of LDH-C-dot was -16.4 mV closer to C-dot. These observation suggests there is a clear contrast between two composites. That is, the composite of LDH/GO consists of coverage of larger sheets of GO with smaller sheets of LDH, while the composite of LDH/C-dot consists of coverage of larger sheets of LDH with nano-sized C-dot. Accordingly it is promising to customize the ratio of LDH/GO in the composite considering the different radioactive waste water compositions to treat in various stages.",
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