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Removal of Cesium Ions by Prussian Blue-Attached Nanofibers
권영진,이택승 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
A large amount of radioactive material was released in 2011 due to an accident at the Fukushima nuclear power plant. Radioactive cesium, which is contained in the released radioactive material, is harmful to humans and crops because of its long half-life. Because it is highly soluble in water, it easily pollutes the environment near the radiation leak. Therefore, radioactive cesium must be removed. Prussian blue (PB) has a very high adsorption capacity selectively for cesium ions and is used as an adsorbent. However, since PB particles form colloids in water, they can easily contaminate water. In addition, it is difficult to separate PB particles from aqueous solution. Therefore, it is necessary to attach PB particles to the nanofibers to easily separate them from aqueous solution. The nanofibers were electrospun using polyacrylonitrile (PAN) and the surfaces of the PAN nanofibers were coated with polydopamine to attach PB particles. After that, we tested the adsorption of cesium ions.
이중 페로브스카이트 촉매 PrBaMn2O5+δ의 고온전기분해조(Solid Oxide Electrolysis Cell) 연료극 촉매로 적용 가능성에 대한 연구
권영진,김동연,배중면 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.4
The hydrogen(H2) is promising energy carrier of renewable energy in the microgrid system such as small village and military base due to its high energy density, pure emission and convenient transportation. H2 can be generated by photocatalytic water splitting, gasification of biomass and water electrolysis driven by solar cell or wind turbine. Solid oxide electrolysis cells(SOECs) are the most efficient way to mass production due to high operating temperature improving the electrode kinetics and reducing the electrolyte resistance. The SOECs are consist of nickel-yttria stabilized zirconia(NiO-YSZ) fuel electrode / YSZ electrolyte / lanthanum strontium manganite-YSZ(LSM-YSZ) air electrode due to similarity to Solid Oxide Fuel Cells(SOFCs). The Ni-YSZ most widely used fuel electrode shows several problems at SOEC mode such as degradation of the fuel electrode because of Ni particle’s redox reaction and agglomeration. Therefore Ni-YSZ need to be replaced to an alternative fuel electrode material. In this study, We studied on the Double perovskite PrBrMnO5+δ(PBMO) due to its high electric conductivity, catalytic activity and electrochemical stability. PBMO was impregnated into the scaffold electrolyte La0.8Sr0.2Ga0.85Mg0.15O3-δ(LSGM) to be synthesized at low temperature for avoiding secondary phase generated when it exposed to high temperature. The Half cell test was conducted at SOECs and SOFCs modes.
첨가제와 소결방법이 EFA Dust/점토 소결체의 경량화에 미치는 영향
권영진,이기강,김유택,김영진,강승구,김정환,박명식 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.3
지정폐기물인 EAF(Electric Arc Furnace) Dust는 현재 대부분이 매립 등 부적절하게 처리되고 있어 지하수 오염 등의 환경 파괴를 일으킬 위험이 있다. EAF Dust의 자원화를 위하여 EAF Dust/점토 조성으로 세라믹 다공체의 제조 가능성을 연구하였다. 출발 원료들의 혼합은 습식 공정으로 행하였으며, 소결 방법은 급속 소결과 일반 소결을 각각 적용하였다. 소결된 시편의 비중, 기공 및 미세구조를 관찰한 결과. 시편내의 발포현상은 탄소(C)의 양과 액상 생성의 유무에 의해 결정됨이 밝혀졌다. 발포를 용이하게 발생시켜 다공체의 경량골재를 얻기 위해서는 소결 시 급열처리하는 것이 유리하였다. EAF(Electric Arc Furnace) Dust classified as special wastes containing heavy metal contaminants may cause to damage an environment such as underground water contamination if they were not treated properly. The possibility of producing the porous sintered body made from EAF Dust/clay composition system was studied. Mixing of EAF Dust and clay was carried out using wet-mixing process and two different sintering methods such as rapid and normal heat treatment were tried. By observing density, porosity and microstructure of sintered bodies, it was found that the bloating phenomenon depend on the contents of C, where the liquid phase occur or not during the sintering process. To obtain a light-aggregate of porous body due to bloating, the rapid heating was better than the normal heating at sintering process.