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

Yuta Kamura, Paulmanickam Koilraj, Tsuyoshi Hirajima, Keiko Sasaki

研究成果: Contribution to conferencePaper査読

抄録

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.

本文言語英語
出版ステータス出版済み - 1 1 2017
イベント14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 - Sapporo, Hokkaido, 日本
継続期間: 9 26 20179 29 2017

会議

会議14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017
国/地域日本
CitySapporo, Hokkaido
Period9/26/179/29/17

All Science Journal Classification (ASJC) codes

  • 環境科学(全般)

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「Synthesis of layered double hydroxide/different carbon material <sub>and 90Sr2+</sub> composites for simultaneous adsorption of <sup>79</sup>SeO<sub>4</sub><sup>2-</sup>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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