Effective adsorption and collection of cesium from aqueous solution using graphene oxide grown on porous alumina

多孔質アルミナ上酸化グラフェンによる水溶液からの効果的なセシウム吸着と回収

圓谷 志郎*; 本田 充紀   ; 下山 巖   ; Li, S.*; 楢本 洋*; 矢板 毅; 境 誠司*

Entani, Shiro*; Honda, Mitsunori; Shimoyama, Iwao; Li, S.*; Naramoto, Hiroshi*; Yaita, Tsuyoshi; Sakai, Seiji*

Graphene oxide (GO) with a large surface area was synthesized by the direct growth of GO on porous alumina using chemical vapor deposition to study the Cs adsorption mechanism in aqueous solutions. Electronic structure analysis employing in situ near-edge X-ray absorption fine structure spectroscopy and X-ray photoelectron spectroscopy measurements clarifies the Cs atoms bond via oxygen functional groups on GO in the aqueous solution. The Cs adsorption capacity was found to be as high as 650-850 mg g, which indicates that the GO/porous alumina acts as an effective adsorbent with high adsorption efficiency for radioactive nuclides in aqueous solutions.