Academic Journal
U(VI) and Th(IV) recovery using silica beads functionalized with urea- or thiourea-based polymers – Application to ore leachate
| العنوان: | U(VI) and Th(IV) recovery using silica beads functionalized with urea- or thiourea-based polymers – Application to ore leachate |
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| المؤلفون: | Hamza, Mohammed, Wei, Yuezhou, Khalafalla, Mahmoud, Abed, Neveen, Fouda, Amr, Elwakeel, Khalid, Guibal, Eric, Hamad, Nora |
| المساهمون: | School of Nuclear Science and Technology Lanzhou (SNST), Lanzhou University, Nuclear Materials Authority Le Caire, Shanghai Jiao Tong University Shanghai, Al-Azhar University Cairo, Egypt, University of Jeddah, Port Said University, Polymères Composites et Hybrides (PCH - IMT Mines Alès), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT), Menoufia University Egypte |
| المصدر: | ISSN: 0048-9697. |
| بيانات النشر: | HAL CCSD Elsevier |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Urea and thiourea functionalization of silica beads, Uranium and thorium sorption and desorption, Sorption kinetics and isotherms, Selectivity issues, Application to acidic leachates, [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.GENI]Chemical Sciences/Chemical engineering, [SDE.IE]Environmental Sciences/Environmental Engineering |
| الوصف: | International audience ; Urea and thiourea have been successfully deposited at the surface of silica beads (through one-pot reaction with formaldehyde) for the recovery of U(VI) and Th(IV) to produce UR/SiO2 and TUR/SiO2 composites, respectively. These materials have been characterized by FTIR, titration, elemental analysis, BET, TGA, SEM-EDX for identification of structural and chemical properties, and interpretation of binding mechanisms. Based on deprotonation of reactive groups (amine, carbonyl, or thiocarbonyl) and metal speciation, the optimum pH was ~4. Uptake kinetics was fast (equilibrium within 60–90 min). Although the kinetic profiles are fitted by the pseudo-first order rate equation, the resistance to intraparticle diffusion cannot be neglected. Sorption isotherms were fitted by Langmuir equation (maximum sorption capacities: 1–1.2 mmol g−1). Thermodynamics are also investigated showing differences between the two types of functionalized groups: exothermic for TUR/SiO2 and endothermic for UR/SiO2. Metal desorption is highly effective using 0.3–0.5 M HCl solutions: total desorption occurs within 30–60 min; sorption/desorption properties are remarkably stable for at least 5 cycles. The sorbents have marked preference for U(VI) and Th(IV) over alkali-earth and base metals at pHeq ~4.8. By preliminary precipitation steps it is possible “cleaning” ore leachates of pegmatite ore, and recovering U(VI) and Th(IV) using functionalized silica beads. After elution and selective recovery by precipitation with oxalate (Th-cake) and alkaline (U-cake), the metals can be valorized. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | hal-03533835; https://imt-mines-ales.hal.science/hal-03533835; https://imt-mines-ales.hal.science/hal-03533835v1/document; https://imt-mines-ales.hal.science/hal-03533835v1/file/u-vi-et-th-iv-recovery.pdf |
| DOI: | 10.1016/j.scitotenv.2022.153184 |
| الاتاحة: | https://imt-mines-ales.hal.science/hal-03533835 https://imt-mines-ales.hal.science/hal-03533835v1/document https://imt-mines-ales.hal.science/hal-03533835v1/file/u-vi-et-th-iv-recovery.pdf https://doi.org/10.1016/j.scitotenv.2022.153184 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.66381300 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.scitotenv.2022.153184 |
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