(PPT) SẮC KY LỚP MỎNG | Tien Vo

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Đánh Giá Biến Đổi Của Sét Núi Nưa Trong Môi Trường Kiềm Nhằm Cô Lập Rác Thải Có Tính Phóng XạVân Thảo

KỶ YẾU HỘI THẢO CAREES 2019 NGHIÊN CỨU CƠ BẢN TRONG LĨNH VỰC KHOA HỌC TRÁI ĐẤT VÀ MÔI TRƯỜNG, 2019

Clay from Nui Nua area (Co Dinh valley, Thanh Hoa province) characterized by mainly Fesmectite was used to study short-term alteration in high-alkaline solutions of 1M NaOH and KOH. Starting material and treated products were carried out by XRD, FT-IR, and TEM-EDX methods to identify changes in structure and chemical composition of smectite particles. The yielded results all showed changes in the structure of Nui Nua Fe-smectite: from Ca-dominating interlayer in the starting material into Na-dominating or K-dominating interlayer in the products. Therefore, a process of ion exchange has happened. Besides, dissolution of a part of Fe-smectite particles also worked in such high-alkaline solution. Both processes resulted in illitization and consequently, the expandability and self-sealing ability of the clay reduced. With this finding, the isolation capacity of the Nui Nua clay for radioactive is limited in such high-alkaline solution.

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