首页|Synergistic Bilayer-modified Electrode and Pulse Electrochemistry for Efficient Uranium Extraction from Seawater
Synergistic Bilayer-modified Electrode and Pulse Electrochemistry for Efficient Uranium Extraction from Seawater
Peng, Ms. Jian-Yi Chen, Ms. Qin Chen, Ms. Xiao-Mei Zhu, Ms. Zi-Yue He, Ms. Jing Fan, Ms. Qin-Qin Jiang, Dr. Zhen-Ju Wang, Dr. Yu Feng, Dr. Jing
Synergistic Bilayer-modified Electrode and Pulse Electrochemistry for Efficient Uranium Extraction from Seawater
Synergistic Bilayer-modified Electrode and Pulse Electrochemistry for Efficient Uranium Extraction from Seawater
摘要
The extraction of uranium from seawater is crucial for sustainable nuclear energy but remains challenging due to low concentration, carbonate competition, and energy-intensive processes. Herein, this study developed and systematically evaluated a novel electrode material, CF@MTPN, coupled with the energy-efficient double potential step technique (DPST) for the highly efficient extraction of uranium from seawater. CF@MTPN was fabricated through sequential self-assembly of iron-tannic acid (Fe-TA) network and an iron-phytic acid (Fe-PA) complex on carbon felt. In simulated seawater (5 mg L -1 uranyl, 2 mM Na 2 CO 3 , pH 8.1), CF@MTPN achieved rapid uranium removal efficiencies of 90.3% (potentiostatic technique, PST) and 93.3% (DPST) within 15 min, with corresponding extraction capacities of 96.12 and 99.31 mg g -1 d -1 , respectively. Notably, during the DPST process (0 V/-1.3 V), current oscillations led to the detachment of the Fe-PA layer from the control electrode CF@MPN, alongside progressive oxidation of the bare CF surface. In contrast, the introduction of an inner Fe-TA layer in CF@MTPN effectively resolved these stability issues, allowing CF@MPN to maintain its structural integrity throughout an extended DPST operation. Moreover, DPST dramatically enhanced the Faradaic efficiency by 430% over PST by effectively suppressing the competing hydrogen evolution reaction. Practical viability was confirmed through a continuous-flow experiment with 20 L of natural seawater, achieving a uranium recovery of 60.0 μg and a high extraction capacity of 3.62 mg g -1 d -1 over 5 h. This work presents a synergistic material and process solution for efficient, stable, and energy-conscious uranium extraction from seawater.
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