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Hamza MF, Wei Y, Khalafalla MS, Abed NS, Fouda A, Elwakeel KZ, Guibal E, Hamad NA. U(VI) and Th(IV) recovery using silica beads functionalized with urea- or thiourea-based polymers - Application to ore leachate. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 821:153184. [PMID: 35051487 DOI: 10.1016/j.scitotenv.2022.153184] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 12/15/2021] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
Urea and thiourea have been successfully deposited at the surface of silica beads (through one-pot reaction with formaldehyde) for designing new sorbents for U(VI) and Th(IV) recovery (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.
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Affiliation(s)
- Mohammed F Hamza
- School of Nuclear Science and Technology, University of South China, Heng Yang 421001, China; Nuclear Materials Authority, POB 530, El-Maadi, Cairo, Egypt.
| | - Yuezhou Wei
- School of Nuclear Science and Technology, University of South China, Heng Yang 421001, China; School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.
| | | | - Neveen S Abed
- Nuclear Materials Authority, POB 530, El-Maadi, Cairo, Egypt.
| | - Amr Fouda
- Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt.
| | - Khalid Z Elwakeel
- University of Jeddah, College of Science, Department of Chemistry, Jeddah, Saudi Arabia; Environmental Science Department, Faculty of Science, Port-Said University, Port-Said, Egypt.
| | - Eric Guibal
- Polymers Composites and Hybrids (PCH), IMT Mines Ales, Alès, France.
| | - Nora A Hamad
- Faculty of Science, Menoufia University, Shebine El-Koam, Egypt.
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Banerjee S, Kundu A, Dhak P. Bioremediation of uranium from waste effluents using novel biosorbents: a review. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08304-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Fan M, Wang X, Song Q, Zhang L, Ren B, Yang X. Review of biomass-based materials for uranium adsorption. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-08003-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Enhancement of U(VI) biosorption by Trichoderma harzianum mutant obtained by a cold atmospheric plasma jet. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07615-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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