Pohang University of Science and Technology · Engineering
우용엄 교수의 연구실은 고준위 원자력 폐기물의 안정적 고립을 위한 첨단 재료 및 화학적 처리 기반 기술 개발에 중점을 두고 있습니다. 특히 테크네티움-99와 유기우라늄 등 장기 방사성 폐기물의 환원 및 고정 메커니즘을 규명하고, 철 산화물 기반 고형물과 나노복합재료를 활용한 고체화 기술을 연구하고 있습니다. 또한, 방사성 오염수에서 이odor, 세렌, 스트론티움 등의 이동성 높은 뉴클리드를 효과적으로 제거할 수 있는 선택적 흡착제 개발에도 기여하고 있습니다.
Figures are computed from collected data and may differ slightly.
During the nuclear waste vitrification process volatilized (99)Tc will be trapped by melter off-gas scrubbers and then washed out into caustic solutions, and plans are currently being contemplated for the disposal of such secondary waste. Solutions containing pertechnetate [(99)Tc(VII)O(4)(-)] were mixed with precipitating goethite and dissolved Fe(II) to determine if an iron (oxy)hydroxide-based waste form can reduce Tc(VII) and isolate Tc(IV) from oxygen. The results of these experiments demon
The immobilization of long-lived radionuclide wastes generated from nuclear power plants (NPPs) during NPP operation, fuel reprocessing, and decommissioning of nuclear reactors is of great environmental concern. Designing suitable matrices with high durability, stability, and resistivity to various physical and chemical conditions (temperature, pressure, radiation, acidity/alkalinity, etc.) are required for the safe disposal and effective immobilization of radioactive wastes. In this review, we
Technetium (Tc) remains a priority remediation concern due to persistent challenges, including mobilization due to rapid reoxidation of immobilized Tc, and competing comingled contaminants, e.g., Cr(VI), that inhibit Tc(VII) reduction and incorporation into stable mineral phases. Here Fe(OH)<sub>2</sub>(s) is investigated as a comprehensive solution for overcoming these challenges, by serving as both the reductant, (Fe(II)), and the immobilization agent to form Tc-incorporated magnetite (Fe<sub>
Bismuth-functionalized graphene oxide (Bi-GO) was successfully synthesized and showed both high iodide and iodate removal efficiencies from radioactive wastewater. Batch experiments for kinetic and selectivity tests were performed, respectively. Additional SEM, XRD, FT-IR, and XPS analyses were performed for characterization of a sorbent and bismuth on the GO surface and this confirmed that bismuth on the GO surface reacted with iodine species by surface complexation (or precipitation). Dominant
Abstract A series of batch sorption and column experiments was conducted to investigate sorption and transport behavior of 99 Tc, 129 I, 79 Se, and 90 Sr on and through borehole sediments collected from the proposed low-level radioactive waste disposal facility at the Hanford Site (200 East Area). Batch sorption experiments were conducted on Hanford sediment using uncontaminated Hanford groundwater and simulated glass leachates spiked with individual radionuclides. Strongest sorption occurred fo
Macroscopic and spectroscopic investigations (XAFS, XRF, and TRLIF) on Hanford contaminated vadose zone sediments from the U-tank farm showed that U(VI) exists as different surface phases as a function of depth below ground surface (bgs). Secondary precipitates of U(VI) silicate precipitates (boltwoodite and uranophane) were present dominantly in shallow-depth sediments (15-16 m bgs), while adsorbed U(VI) phases and polynuclear U(VI) surface precipitates were considered to dominate in intermedia
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