Active and selective removal of Cs from contaminated water by self-propelled magnetic illite microspheres

JOURNAL OF HAZARDOUS MATERIALS

卷:416

Article

Park, Chan Woo¹  Kim, Taeeun^1,2  Yang, Hee-Man¹  Lee, Yeonsoo^1,3  Kim, Hyung-Ju¹ 

[1] Korea Atom Energy Res Inst, Decommissioning Technol Res Div, Daedeok Daero 989-111, Daejeon, South Korea

[2] Chungnam Natl Univ, Dept Environm Engn, 99 Daehak Ro, Daejeon, South Korea

[3] Chungnam Natl Univ, Dept Organ Mat Engn, 99 Daehak Ro, Daejeon, South Korea

关键词: Clay;    Illite;    Micrometer;    Cesium;    Adsorbent;    Self-propulsion;   

DOI  :  10.1016/j.jhazmat.2021.126226

来源: Elsevier

【 摘 要 】

We report the fabrication of clay-mineral-based Janus microspheres that exhibit remotely steerable self-propulsion in water, facilitating their selective and active removal of radiocesium from a contaminated solution. The spray-drying of slurries of intrinsically Cs-selective illite containing iron oxide nanoparticles led to magnetic illite microspheres with superior Cs-137 adsorption capability and superparamagnetic behavior. The Janus micromotor adsorbent was prepared by depositing catalytic Pt onto the half-surface of magnetic illite microspheres. The micromotor adsorbents exhibited self-propulsion at speeds as high as similar to 265 mu m/s via asymmetric bubble generation in water containing H2O2 as a fuel. The self-propulsion of the adsorbent improved the Cs adsorption kinetics six-folds compared with the kinetics in the corresponding stationary liquid. The magnetic properties of the micromotor adsorbent enabled convenient separation and direction control of the adsorbents under an external magnetic field. In particular, the micromotor adsorbent could successfully remove more than 98.6% of Cs-137 from aqueous media containing competing ions including K+, Na+, Ca2+ and Mg2+.

【 授权许可】

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