프러시안블루 및 유기점토 함유 하이드로겔 비드의 세슘 및 요오드 제거 특성 (Removals of Radioactive Cesium and Iodide by Composite Hydrogel Beads Impregnated with Organoclay and Prussian blue)

서지정보

· 발행기관 : 한국수처리학회
· 수록지 정보 : 한국수처리학회지 / 29권 / 6호 / 33 ~ 41페이지
· 저자명 : 김복성, 강성원

초록

Radiation severely damages the environment in the event of a radioactive explosion, such as the one that occurred at the Fukushima nuclear power plant in 2011. Radioactive cesium and radioactive iodine, in particular, are known to be the main causes of environmental pollution. This study aimed to develop a composite adsorbent that can remove Cs+ and I− from a waterbody simultaneously. Prussian blue (PB) and organoclay are known to be effective in adsorbing cesium and iodide, respectively. Therefore, an organoclay–PB in alginate (OPAL) bead with layer-by-layer synthesis was developed. Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric (TG) analyses were used to determine if organoclay and PB were synthesized in the OPAL bead. According to the isothermal adsorption experimental results, the maximum adsorption capacity of Cs+ and I− obtained using the Langmuir isotherm model was 26.4 and 3.39 mg/g, respectively. The adsorption rate of Cs+ on the OPAL bead was found to be fast in a dual solute adsorption system. The adsorption capacity of the single and dual solute adsorption systems for Cs+ ions increased rapidly up to 1 h, and the adsorption equilibrium was attained 3 h later. The dual solute adsorption system had a higher adsorption rate for I− ions. This demonstrates that the developed composite adsorbent can be used to remove Cs+ and I− from water simultaneously.

영어초록

Radiation severely damages the environment in the event of a radioactive explosion, such as the one that occurred at the Fukushima nuclear power plant in 2011. Radioactive cesium and radioactive iodine, in particular, are known to be the main causes of environmental pollution. This study aimed to develop a composite adsorbent that can remove Cs+ and I− from a waterbody simultaneously. Prussian blue (PB) and organoclay are known to be effective in adsorbing cesium and iodide, respectively. Therefore, an organoclay–PB in alginate (OPAL) bead with layer-by-layer synthesis was developed. Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric (TG) analyses were used to determine if organoclay and PB were synthesized in the OPAL bead. According to the isothermal adsorption experimental results, the maximum adsorption capacity of Cs+ and I− obtained using the Langmuir isotherm model was 26.4 and 3.39 mg/g, respectively. The adsorption rate of Cs+ on the OPAL bead was found to be fast in a dual solute adsorption system. The adsorption capacity of the single and dual solute adsorption systems for Cs+ ions increased rapidly up to 1 h, and the adsorption equilibrium was attained 3 h later. The dual solute adsorption system had a higher adsorption rate for I− ions. This demonstrates that the developed composite adsorbent can be used to remove Cs+ and I− from water simultaneously.

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