용존 6가 우라늄 및 실리카 표면 흡착 6가 우라늄 화학종 분포 연구

• 영문명: Study on the Species Distributions of Dissolved U(VI) and Adsorbed U(VI) on Silica Surface
• 발행기관: 한국방사성폐기물학회
• 저자명: 정의창 김태형 조용흠 김희경 조혜륜 차완식 백민훈 윤종일
• 간행물 정보: 『Journal of Nuclear Fuel Cycle and Waste Technology (JNFCWT)』Vol.18 No.1, 63~72쪽, 전체 10쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2020.03.30

국문 초록

Dissolved hexavalent uranium can exist in the form of several different chemical species. Furthermore, species distributions depend on the pH value of the aqueous solution. Representatively, UO22+, UO2OH+, (UO2)2(OH)22+, and (UO2)3(OH)5+ species coexist in solutions at acidic and circumneutral pH values. When amorphous silica particles are suspended in an aqueous solution, the dissolved chemical species are easily adsorbed onto silica surfaces. In this study, it was examined whether the species distribution of the adsorbed U(VI) on a silica surface followed that of the dissolved U(VI) in an aqueous solution. Time-resolved luminescence spectra of three different dissolved species(UO22+, UO2OH+, and (UO2)3(OH)5+) and two different adsorbed species (≡SiO2UO2, ≡SiO2(UO2)OH–, or ≡SiO2(UO2)3(OH)5–) were measured in the pH range 3.5−7.5. The spectral shapes of these chemical species were compared by changing the pH value; consequently, it was confirmed that the species distribution of the adsorbed U(VI) species was different from that of the dissolved U(VI) species.

키워드

Luminescence Hexavalent uranium Dissolved uranium Adsorbed uranium Silica