Radiation synthesis of ionic liquid–functionalized silica-based adsorbents: a preliminary investigation on its application for removal of ReO4− as an analog for TcO4−
Autor: | Long Zhao, Kangjun Xie, Zhen Dong |
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Rok vydání: | 2021 |
Předmět: |
Fission products
Chemistry Health Toxicology and Mutagenesis General Medicine Human decontamination 010501 environmental sciences 01 natural sciences Pollution Chloride Solvent chemistry.chemical_compound Adsorption Wastewater Ionic liquid medicine Environmental Chemistry Surface modification 0105 earth and related environmental sciences medicine.drug Nuclear chemistry |
Zdroj: | Environmental Science and Pollution Research. 28:17752-17762 |
ISSN: | 1614-7499 0944-1344 |
Popis: | The decontamination of radioactive TcO4- from nuclear wastes is becoming increasingly crucial for spent nuclear fuel reprocessing and environmental remediation. In this work, a series of ionic liquid-immobilized silica-based adsorbents (SVIL-Cn, n = 1, 4, 8) were newly synthesized using the radiation-induced grafting of 4-vinylbenzyl chloride onto silanized silica and subsequent functionalization with 1-methylimidazole, 1-butylimidazole, or 1-octylimidazole. The synthesis conditions such as the solvent, absorbed dose, and monomer concentration were investigated in detail, and the resulting adsorbents were characterized by elemental analysis, FT-IR, SEM, and TGA. In batch experiments, the adsorbents exhibited a high ReO4- (a nonradioactive surrogate of TcO4-) removal efficiency over a wide pH range (3 ~ 8), and SVIL-C1 showed a maximum adsorption capacity of 70.62 mg g-1 towards ReO4-. In addition, their adsorption performance barely changed after 800 kGy radiation. The column experiments for treating simulated radioactive wastewater showed that the SVIL-Cn adsorbents could selectively separate TcO4-/ReO4- from a variety of fission products, and they could be recycled four times with negligible capacity loss. Lastly, XPS and FT-IR analysis confirmed that the adsorption proceeded via an ion-exchange mechanism. The results showed that these adsorbents are suitable for the efficient removal of TcO4-/ReO4- from radioactive wastewater with complex compositions. |
Databáze: | OpenAIRE |
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