Direct extraction of U(VI) from alkaline solution and seawater via anion exchange by metal-organic framework
| Autor: | Le Zhang, Chang Sheng Yan, Jian Qiang Li, Le Le Gong, Heng Ya Gao, Yang Yang Xiong, Hui Qiong Wu, Xue Feng Feng, Feng Luo |
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| Rok vydání: | 2017 |
| Předmět: |
Ion exchange
Chemistry General Chemical Engineering Inorganic chemistry Extraction (chemistry) Cationic polymerization chemistry.chemical_element 02 engineering and technology General Chemistry Uranium 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Adsorption Environmental Chemistry Seawater Metal-organic framework 0210 nano-technology Selectivity |
| Zdroj: | Chemical Engineering Journal. 316:154-159 |
| ISSN: | 1385-8947 |
| Popis: | Directly extracting uranium from alkaline solution and seawater through an effective and economical method is still a challenging task. In this work, we for the first time propose a method of anionic exchange, based on a cationic MOF (metal-organic framework) adsorbent, namely Co-SLUG-35, to directly extract U(VI) from alkaline solution and seawater (South China Sea). The U(VI) adsorption experiments indicates that the EDS2− anions in Co-SLUG-35 can be completely replaced by U(VI) ions in an anionic manner, leading to an adsorption capability of 118 mg/g from alkaline U(VI) solution and excellent extraction efficiency of 1.05 mg/g from 1 L actual seawater in the concentration of 5.35 ppb. Most importantly, unlike other MOFs where degassing is primarily needed, however the use of present MOF need not any pretreatment. Moreover, ultrahigh selectivity towards U(VI) ions even over CrO42− and Cl− ions is also observed in Co-SLUG-35, suggesting its superior potential in extraction of uranium from seawater. |
| Databáze: | OpenAIRE |
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