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천연광물 흡착제 및 고염기도 PAC를 이용한 용존성 Cs의 처리특성
김복성(Bokseong Kim),김영석(Youngsuk Kim),정윤선(Yoonsuhn Chung),강성원(Sungwon Kang),오대민(Daemin Oh),채호준(Hojun Chae) 대한환경공학회 2017 대한환경공학회지 Vol.39 No.7
응집 침전기술인 방사능 오염물질의 처리장치의 용존성 Cs 처리특성을 평가하였다. 방사능 오염물질 처리장치는 전흡착부, 고형물침전부, 후흡착부로 구성하였다. 흡착제는 천연광물 일라이트를 입자크기에 따라 LPI (Large Particle Illite), SPI (Small Particle Illite)로 구분하여 사용하였고, 응집제는 고염기도 PAC (poly aluminum chloride)을 사용하였다. 흡착제는 판상구조형태로 주로 석영, 조장석, 백운모로 구성되었으며, LPI, SPI의 Surface area는 각각 4.201 m²/g, 4.227 m²/g으로 나타났고 입자크기는 각각 197.4-840.9 μm, 3.28-53.57 μm로 나타났다. 천연광물인 일라이트의 흡착효율은 LPI는 82.8%, SPI는 85.6%로 나타났고 흡착제 회수에 대한 간접적인 지표인 탁도의 제거율은 96.4%, 98.3%로 나타났다. This study investigated removal characteristic of soluble Cs in water by RPT (Radioactivity pollutant treatment) with coagulation and sedimentation. The RPT conducted with various chemical and natural coagulants to remove the soluble Cs which consisted pre-adsorption, Sedimentation and post-adsorption. Natural absorbent included Illite and zeolite. Especially, Illite divided LPI (Large Particle Illite) and SPI (Small Particle Illite) by grain size. Also, Chemical coagulants included high basicity PAC (poly aluminum chloride). The adsorbent had a plate structure mainly composed of quartz, albite and muscovite. The surface area were 4.201 m²/g and 4.227 m²/g and the particle sizes were 197.4-840.9 μm and 3.28-53.57 μm, respectively. The adsorption efficiency of the natural Illite was 82.8% for LPI and 85.6% for SPI. The removal efficiency of turbidity, which was an indirect indicator of adsorbent recovery, was 96.4% and 98.3%, respectively.
프러시안블루의 LBL(Layer-by-Layer) 합성법에 의한 알지네이트 비드형 흡착제의 세슘 흡착 특성연구
김복성(Bok Seong Kim),강성원(Sung Won Kang) 대한환경공학회 2021 대한환경공학회지 Vol.43 No.12
목적: 원전사고나 방사능 폐기물 유출에 의한 방사성 오염물질의 수계 확산시 수중 세슘(Cs)을 선택적으로 흡착할 수 있는 비드형 흡착제를 개발하고자 하였다. 방법: 알지네이트를 지지체로 하고 PB를 고정화한 PA(prussian blue-Alginate bead) 비드와 PB를 다중고정화 방식인 Layer-by-Layer (LBL) 합성법으로 PB를 고정화된 PAL (Prussian blue-Alginate bead with LBL synthesis) 비드를 개발하였다. 결과 및 토의 : SEM (EDS) 및 TG 분석을 통해 LBL 합성법이 적용된 PAL 비드가 PA 비드와 비교하여 PB 함량이 6.31% 향상된 것을 확인하였다. 개발 흡착제의 세슘 흡착성능을 평가하였는데, PA 비드의 최대흡착량(qm)이 25.783 ㎎/g이었고 PAL 비드는 28.294 ㎎/g으로 확인되어 LBL 합성방법에 의해 Cs 흡착능이 향상된 것을 확인하였다. 또한 흡착제의 안정성을 판단하기 위해 PA 비드 및 PAL 비드의 합성 이후 세척수를 UV-vis 분석한 결과, PAL 비드의 PB 탈착이 더 낮게 나타나 LBL 합성으로 안정성도 향상된 것을 확인하였다. 결론: 본 연구에서는 수중에 존재하는 Cs을 선택적으로 흡착하기 위한 흡착제를 개발하기 위해 알지네이트 비드 내 PB를 화학적으로 고정화한 흡착제를 개발하였다. PB 고정화는 LBL 합성법을 적용하여 진행하였고 최종적으로 PAL 비드의 최대흡착량(qm)은 28.294 ㎎/g으로 나타나 방사성 세슘 오염수에 효과적이고 안정적으로 적용될 수 있을 것으로 기대된다. Objectives : The purpose of this study was to develop an adsorbent to which Prussian blue (PB) is stably immobilized to remove radioactive cesium (Cs). Methods : Prussian blue-Alginate (PA) bead and Prussian blue-Alginate with Layer-by-layer synthesis (PAL) bead were synthesized by immobilizing PB respectively. Results and Discussion : As a results of XRD and FT-IR analysis, PB was successfuuly immobilized in alginate bead and PA, PAL bead. SEM (EDS) and TG analysis data were confirmed that the PB content of the PAL bead to which the LBL synthesis method was applied was improved by 6.31%. It was confirmed that the Cs adsorption capacity was improved through the LBL assembly process. The maximum adsorption amount (qm) of PA bead was 25.783 ㎎/g, and PAL bead was ㎎/g. In addition, as a result of UV-vis analysis of washing water after synthesis of PA bead and PAL bead, it was confirmed that the PB desorption of the PAL bead was lower indicating that the stability was also improved by LBL synthesis. Conclusions : We developed an adsorbent which prussianblue immobilized on alginate bead for selective removal cesium in aqueous solution. PB was immobilized by LBL synthesis method qm of PAL beads was 28.294 ㎎/g. It was expected to applied effectively and stably to radioactive cesium contaminated water.
프러시안블루 및 유기점토 함유 하이드로겔 비드의 세슘 및 요오드 제거 특성
김복성 ( Bokseong Kim ),강성원 ( Sungwon Kang ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.6
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<sup>+</sup> and I<sup>-</sup> 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<sup>+</sup> and I<sup>-</sup> obtained using the Langmuir isotherm model was 26.4 and 3.39 mg/g, respectively. The adsorption rate of Cs<sup>+</sup> 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<sup>+</sup> 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<sup>+</sup> and I<sup>-</sup> from water simultaneously.