논문 해외 국제전문학술지(SCI급) First Successful Synthesis of an Al-rich Mesoporous Aluminosilicate for Fast Radioactive Strontium Capture
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2023-06
- 저자명 Jeon, H., Seok, J., Ha, Y., Kim, J.-C., Cho, H. S., Yang, H.-M., and Choi, M.*
- 학술지명 Journal of Hazardous Materials
- 발행처명 Elsevier
- 발행국가 해외
- 논문언어 외국어
- 원문 링크 https://www.sciencedirect.com/science/article/abs/pii/S0304389423004181
홈페이지논문 초록 (Abstract)
Al-rich zeolites such as NaA (Si/Al = 1.00) have been widely applied to remove radioactive 90Sr2+ because of their high surface charge density enabling efficient ion-exchange of multivalent cations. However, due to the small micropore diameters of zeolites and large molecular size of strongly hydrated Sr2+, Sr2+-exchange with zeolites suffers from very slow kinetics. In principle, mesoporous aluminosilicates with low Si/Al ratios close to unity and tetrahedrally coordinated Al sites can exhibit both high capacity and fast kinetics in Sr2+-exchange. Nonetheless, the synthesis of such materials has not been realized yet. In this study, we demonstrate the first successful synthesis of an Al-rich mesoporous silicate (ARMS) using a cationic organosilane surfactant as an efficient mesoporogen. The material exhibited a wormhole-like mesoporous structure with a high surface area (851 m2 g–1) and pore volume (0.77 cm3 g–1), and an Al-rich framework (Si/Al = 1.08) with most Al sites tetrahedrally coordinated. Compared to commercially applied NaA, ARMS exhibited a dramatically improved Sr2+-exchange kinetics (>33-fold larger rate constant) in batch adsorption while showing similarly high Sr2+ capture capacity and selectivity. Due to the fast Sr2+-exchange kinetics, the material also exhibited 3.3-fold larger breakthrough volume than NaA in fixed-bed continuous adsorption.