Synthesis of layered double hydroxide/different carbon material and 90Sr2+ composites for simultaneous adsorption of 79SeO42-

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 79SeO42- and 90Sr2+ 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 SeO42- and Sr2+ was achieved in both composites using surrogates, though ion-exchange of SeO42- with NO 3- in LDH and complexation of Sr2+ with carboxyl group in carbon materials. Comparable adsorption capacities of SeO42- was observed on both composites. However, Sr2+ adsorption capacities were much larger in LDH/GO than LDH/C-dot in any cases of different carbon contents. In addition, Sr2+ 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

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)

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  • 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 79SeO42-. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.