Acta Phys. -Chim. Sin. ›› 2025, Vol. 41 ›› Issue (4): 100032.doi: 10.3866/PKU.WHXB202404006
Special Issue: Electrochemical Separation and Recycling
• REVIEW • Previous Articles Next Articles
Guoze Yan1, Bin Zuo1,*, Shaoqing Liu1, Tao Wang1, Ruoyu Wang1, Jinyang Bao1, Zhongzhou Zhao1, Feifei Chu1, Zhengtong Li2, Yamauchi Yusuke3,4,5, Melhi Saad6, Xingtao Xu1,*(
)
Received:2024-04-02
Revised:2024-04-30
Accepted:2024-05-07
Published:2024-12-28
Contact:
Email: zuobin@zjou.edu.cn (Bin Zuo)xingtao.xu@zjou.edu.cn (Xingtao Xu)
Supported by:Guoze Yan, Bin Zuo, Shaoqing Liu, Tao Wang, Ruoyu Wang, Jinyang Bao, Zhongzhou Zhao, Feifei Chu, Zhengtong Li, Yamauchi Yusuke, Melhi Saad, Xingtao Xu. Opportunities and Challenges of Capacitive Deionization for Uranium Extraction from Seawater[J]. Acta Phys. -Chim. Sin. 2025, 41(4), 100032. doi: 10.3866/PKU.WHXB202404006
Fig 1
Schematic diagram of CDI and their electrosorption processes. (a) A CDI cell with two porous electrodes. (b) The schematic of an MCDI cell. (c) The schematic of a FCDI cell. (d) A CDI cell used to selectively remove target ions 45. Adapted with permission from Ref. 45, Copyright 2020 Royal Society of Chemistry."
Table 1
Summary of CDI materials with different adsorbabilities derived from simulation experiments."
| Electrode material/Type | Electrosorption mechanism | Adsorption performance | Ref. | |
| Uptake capacity | Removal ratio | |||
| 3DG | EDL formation | 113.80 mg∙g−1 (at 1.8 Ⅴ) | N/A | |
| CS/GO | EDL formation and complexation | 271.2 mg∙g−1 (at 0.9 Ⅴ) | N/A | |
| CS/BC | EDL formation, ion exchange and complexation | 207.6 mg∙g−1 (at 0.9 Ⅴ and pH 4.0) | N/A | |
| PVA/GO | EDL formation and complexation | 333.0 mg∙g−1 (at 0.9 Ⅴ) | N/A | |
| RGH | EDL, extra micro electric field and complexation | N/A | 97.9% (at 1.2 Ⅴ and 4 h) | |
| HGNbP | Electro-adsorption, electro-reduction and coordination | 1340 mg∙g−1 (in 1000 mg∙L−1 U(Ⅵ) solution) | 99.9% (within 30 min in 50 mg∙L−1 U(Ⅵ) solution) | |
| WO3/C | Synergistic effect of EDLs and pseudocapacitive from WO3/C | 449.9 mg∙g−1 (at 1.2 Ⅴ) | N/A | |
| CMPC | EDLs and pseudocapacitive | 410.33 mg∙g−1 (at 1.2 Ⅴ). | 95.2% | |
| CC/PANI | Hybrid capacitive adsorption and coordination | 282.2 mg∙g−1 (at 0.9 Ⅴ and pH 4.0) | N/A | |
| GO/PPy | EDL and pseudocapacitive adsorption and complexation | 246.5 mg∙g−1 (at pH 4.0 and 0.9 Ⅴ) | N/A | |
| FCDI | Electrosorption and electroreduction | The volume of uranium-containing water was reduced from 2400 mL to 40 mL | 99% | |
| MCDI | Electrosorption | N/A | 98.9% (a groundwater source containing 50 μg∙L−1 uranium) | |
Fig 3
(a) The electrosorption mechanism for U(Ⅵ) removal by CS/BC-2 electrode 116. Adapted with permission from Ref. 116, Copyright 2021 Elsevier. (b) Possible mechanism for U(Ⅵ) electrosorption on PVA/GO-4 117. Adapted with permission from Ref. 117, Copyright 2022 Elsevier. (c) Schematic diagram of electrosorption mechanism of WO3/C electrode 124. Adapted with permission from Ref. 124, Copyright 2020 Elsevier. (d) Possible mechanism for U(Ⅵ) electrosorption on CC/PANI-2 125. Adapted with permission from Ref. 125, Copyright 2023 Elsevier."
Table 2
Summary of CDI materials with different selectivities derived from simulation experiments."
| Electrode material | Electrosorption mechanism | Performance | Ref. | |
| Uptake capacity | Comparation | |||
| NHPC | UO22+ and NHPC produce synergistic effects through coulomb interaction and reduction reaction | 152.43 mg∙g−1 | Kd = 1620.84 mL∙g−1 | |
| CMM | MXene provides a pseudocapacitance/intercalation effect and the conductive base | 582.46 mg∙g−1 (at 1.2 Ⅴ) | 92.3% multi-ionic solution | |
| Amorphous BP nanosheets | The strong coordination between P and U | In aqueous solutions ranging from 0.05 to 130 mg∙L−1, the maximum adsorption capacity is 2584 mg∙g−1. | When nine kinds of ions coexist and the concentration is 100 times, the material maintains good selectivity for uranyl ions. | |
| CSKN-15 | The redox fixation of U(Ⅵ) | 78.34 mg∙g−1 in seawater | SU/M is higher than 120. | |
| HGP hydrogel | The physi-, chemi-, and electro-sorption simultaneously took effect | 545.7 mg∙g−1 (at 1.2 Ⅴ and pH 5.0) | SU/M values for each cation are far above 1. | |
Fig 4
(a) Schematic diagram of electroadsorption mechanism of CMM electrode 139. Adapted with permission from Ref. 139, Copyright 2022 Elsevier. (b) Diagram of faradic reaction and electroadsorption process occurring at CSKN-15 electrode 140. Adapted with permission from Ref. 140, Copyright 2023 Elsevier. (c) Illustration of electrosorption mechanism of HGP electrode 143. Adapted with permission from Ref. 143, Copyright 2019 Elsevier."
Table 3
Basic cost analysis of four UES technologies derived from simulation experiments (US$ per kg of uranium)."
| Technologies | Raw material cost | Working cost | Site and system maintenance cost | Total cost |
| Chemical reduction | $20 to $41 | $20 to $100 | $40 to $120 | $80 to $261 |
| Microbial reduction | $20 to $41 | $50 to $130 | $30 to $56 | $100 to $227 |
| Photocatalytic reduction | $20 to $41 | $23 to $30 | $$30 to $60 | $73 to $131 |
| CDI | $40 to $80 | $0.74 to $1.75 | $10 to $80 | $50.74 to $161.75 |
Fig 6
(a) SEM image of 3DG electrode material 114. Adapted with permission from Ref. 114, Copyright 2019 Springer International Publishing. (b) Structure legend of HGP hydrogel electrode 143. Adapted with permission from Ref. 143, Copyright 2019 Elsevier. (c) Comparison of equilibrium adsorption capacity (qe) in the environment of a single competitive metal ion solution and multiple competitive metal ion solutions 95. Adapted with permission from Ref. 95, Copyright 2020 Elsevier."
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