Electrochemical removal and recovery of uranium: Effects of operation conditions, mechanisms, and implications

Ye, Yin; Fan, Beilei; Qin, Zemin; Tang, Xin; Feng, Yanyue; Lv, Miao; Miao, Shiyu; Li, Hongwan; Chen, Yanlong; Chen, Fan; Wang, Yuheng

doi:10.1016/j.jhazmat.2022.128723

Cited by 37 publications

(11 citation statements)

References 61 publications

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“…This was attributed to the outstanding electrocatalytic performance of the A-TNTAs/Ti mesh electrode and further demonstrated that the A-TNTAs/Ti mesh electrode could significantly reduce the energy consumption of U(VI) removal. In addition, the energy consumption of electroreduction methods using the A-TNTAs/Ti mesh electrode was much lower than that of some other U(VI) electrochemical removal methods. , …”

Section: Resultsmentioning

confidence: 93%

“…In addition, the energy consumption of electroreduction methods using the A-TNTAs/Ti mesh electrode was much lower than that of some other U(VI) electrochemical removal methods. 22,23 One other challenge of U(VI) removal using the electrochemical method is the low removal efficiency in the presence of low concentrations of U(VI). In the previous study, the electrochemical removal efficiency of U(VI) using the Ti plate and the UO 2 /Ti electrodes significantly decreased when the initial U(VI) concentration was lower than 0.5 μM at the potential of −0.6 V. 14 However, when the A-TNTAs/Ti mesh electrode was used for the electroremoval of low-concentration U(VI) (0.15−0.5 μM), the U(VI) concentration decreased rapidly and reached the detection limit (0.0042 μM) within 30 min even at a higher reduction potential (−0.4 V) (Figure 2D).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Lin

Liu

Qie

et al. 2022

Environ. Sci. Technol.

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Groundwater containing naturally occurring uranium is a conventional drinking water source in many countries. Removal of low concentrations of uranium complexes in groundwater is a challenging task. Here, we demonstrated that the TiO2 nanotube arrays/Ti (TNTAs/Ti) mesh electrode could break through the concentration limit and efficiently remove low concentrations of uranium complexes from both simulated and real groundwater. U(VI) complexes in groundwater were electro-reduced to UO2 and deposited on the TNTAs/Ti mesh electrode surface. The adsorption rate and electron transfer rate of the anatase TNTAs/Ti mesh electrode were twice that of the rutile TNTAs/Ti mesh electrode. Therefore, the anatase TNTAs/Ti mesh electrode exhibited excellent electrocatalytic activity toward the electrochemical removal of U(VI), which could work at a higher potential and significantly reduce the energy consumption of U(VI) removal. The U(VI) adsorption capacity on the anatase TNTAs/Ti mesh electrode was limited due to the low U(VI) concentration. However, the anatase TNTAs/Ti mesh electrode displayed a huge U(VI) removal capacity using the electroreduction method, where adsorption and reduction of U(VI) were mutually promoted and induced continuous accumulation of UO2 on the electrode. The accumulated UO2 can be easily recovered in dilute HNO3, and the electrode can be used repeatedly.

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Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Lin

Liu

Qie

et al. 2022

Environ. Sci. Technol.

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“…17 The reduction of soluble uranyl ions to U(IV) precipitation followed by solid−liquid separation is an effective strategy for U removal from aqueous solutions. 18,19 A series of reduction methods, such as chemical reagent reduction, 20 reductive solid materials, 21 electrochemical reduction, 22,23 microbial-assisted reduction, 24 and photocatalytic reduction have been explored. Heterogeneous photocatalytic reduction is considered to be an environmentally friendly and economic method among them, especially the visible light-driven photocatalytic reduction.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the field of nuclear energy and wastewater treatment, the removal and recovery of valuable uranium resources from wastewater containing soluble U(VI) is necessary to the sustainable development of nuclear energy , and considering the biotoxicity and radioactivity of U, the concentration of U in wastewater discharged into the environment must be reduced to a safe level, typically no more than 20 ppb of U (EPA Water Quality Standard) . The reduction of soluble uranyl ions to U(IV) precipitation followed by solid–liquid separation is an effective strategy for U removal from aqueous solutions. , A series of reduction methods, such as chemical reagent reduction, reductive solid materials, electrochemical reduction, , microbial-assisted reduction, and photocatalytic reduction have been explored. Heterogeneous photocatalytic reduction is considered to be an environmentally friendly and economic method among them, especially the visible light-driven photocatalytic reduction. − However, several shortcomings of traditional photocatalysts limit their further applications, for example, the narrow band gap of TiO 2 and g-C 3 N 4 resulted in the weak utilization of visible light, high power Hg or Xe lamps are required in photocatalysis; otherwise, it usually leads to slow catalytic reduction rate U(VI). − Efficient photocatalytic reduction of uranyl by COF materials has also been reported.…”

Section: Introductionmentioning

confidence: 99%

Amide Linkages in Pyrene-Based Covalent Organic Frameworks toward Efficient Photocatalytic Reduction of Uranyl

Kang

Hang

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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The bond linkages in covalent organic frameworks (COFs) partly determine its physical and chemical properties, thus affecting the photoreactive activity by influencing the generation of photoelectrons and the separation of excitons. Herein, pyrenebased amide COF 4,4′,4″,4‴-(pyrene-1,3,6,8-tetrayl)tetrabenzaldehyde−3,8-diamino-6-phenylphenanthridine (TFPPy−DP) was synthesized by postsynthetic modification of imine COFs. Due to the introduction of oxygen atoms into the framework and the change in polarity, an increased number of photogenerated electrons and a wide band gap for amide COFs were found, hydrophilicity and dispersibility were prompted as well. Both imine and amide COF TFPPy−DP were applied in the photocatalytic reduction and removal of toxic U(VI) under visible light, the catalytic reduction equilibrium (91% removal percentage of 238 ppm U at pH 3) was achieved by imine COFs with 10 h of irradiation, while amide COFs only took 2 h of irradiation (82% removal percentage). The much faster photocatalytic reduction rate of U(VI) can be attributed to the fact that amide COF TFPPy−DP retained crystallinity and permanent porosity and exhibited lower electrochemical impedance and enhanced charge separation and accumulation. Further electronic excitation analysis based on time-dependent density functional theory calculations revealed that the intramolecular charge-transfer effect in amide TFPPy−DP enhanced its photocatalytic rate.

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“…[17][18][19] Electrochemical reduction has a high efficiency in uranium extraction. [20,21] However, posttreatment is required after electrical extraction as photocatalytic reduction. [22,23] Therefore, it is an urgent need to develop a simple and effective uranium extraction method.…”

mentioning

confidence: 99%

Bi‐Functional Co/Al Modified 1T‐MoS₂/rGO Catalyst for Enhanced Uranium Extraction and Hydrogen Evolution Reaction in Seawater

Jian

Kang

et al. 2023

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of uranium. [5] Therefore, research on the rapid and selective recovery of uranium element from seawater is of great impor tance for the sustainable development of the nuclear industry. [6][7][8] Currently, the common methods used to extract uranium from seawater include the adsorption, membrane separation, photocatalytic reduction, and electro chemical reduction. [9][10][11][12][13] Adsorption and membrane separation methods, as simple physical methods, have been studied a lot, but the efficiency of uranium extraction is low and more influenced by various complex factors in seawater. [14][15][16] Photo catalytic reduction is a lowcost, non polluting method but it is less efficient and requires posttreatment to separate uraniumcontaining precipitates from the electrode material after electrical extrac tion. [17][18][19] Electrochemical reduction has a high efficiency in uranium extraction. [20,21] However, posttreatment is required after electrical extraction as photocatalytic reduction. [22,23] Therefore, it is an urgent need to develop a simple and effective uranium extraction method.Recently, an electrochemical uranium extraction technique has been proposed to achieve high efficiency uranium extrac tion performance through pH changes around the electrode caused by HER. For example, Wang at al. have proved that a functionalized reduced graphene oxide foam is used as a HER catalyst material to achieve high uranium extraction perfor mance. [24] However, its HER performance is still low, leading to an insufficient uranium extraction performance, and post treatment is required after electrical extraction. Therefore, it is critical to design and develop a highperformance HER catalyst for rapid extraction and recovery of uranium from seawater. It is worth noting that MoS 2 has been widely used as HER catalyst due to its moderate hydrogen adsorption free energy. However, the practical application of MoS 2 in electrocatalysis is hindered by its weak conductivity. [25][26][27] In comparison, reduced gra phene oxide (rhas high charge mobility and large surface area, being effectively used in functional composites as an ideal sup port component. Combining MoS 2 with rGO substrates could enhance the charge transfer between MoS 2 . [28,29] At the same time, modification of various metals has also been used to improve the electrocatalytic activity in MoS 2 . [30][31][32] Compared to Uranium is a key element in the preparation of nuclear fuel. An electrochemical uranium extraction technique is proposed to achieve high efficiency uranium extraction performance through HER catalyst. However, it is still a challenge to design and develop a high-performance hydrogen evolution reaction (HER) catalyst for rapid extraction and recovery of uranium from seawater. Herein, a bi-functional Co, Al modified 1T-MoS 2 /reduced graphene oxide (CA-1T-MoS 2 /rGO) catalyst, showing a good HER performance with a HER overpotential of 466 mV at 10 mA cm −2 in simulated seawater, is first developed. Benefiting from the high HER performance of CA-1T-...

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Electrochemical removal and recovery of uranium: Effects of operation conditions, mechanisms, and implications

Cited by 37 publications

References 61 publications

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Amide Linkages in Pyrene-Based Covalent Organic Frameworks toward Efficient Photocatalytic Reduction of Uranyl

Bi‐Functional Co/Al Modified 1T‐MoS₂/rGO Catalyst for Enhanced Uranium Extraction and Hydrogen Evolution Reaction in Seawater

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Electrochemical removal and recovery of uranium: Effects of operation conditions, mechanisms, and implications

Cited by 37 publications

References 61 publications

Electrocatalytic Removal of Low-Concentration Uranium Using TiO2 Nanotube Arrays/Ti Mesh Electrodes

Electrocatalytic Removal of Low-Concentration Uranium Using TiO2 Nanotube Arrays/Ti Mesh Electrodes

Amide Linkages in Pyrene-Based Covalent Organic Frameworks toward Efficient Photocatalytic Reduction of Uranyl

Bi‐Functional Co/Al Modified 1T‐MoS2/rGO Catalyst for Enhanced Uranium Extraction and Hydrogen Evolution Reaction in Seawater

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Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Bi‐Functional Co/Al Modified 1T‐MoS₂/rGO Catalyst for Enhanced Uranium Extraction and Hydrogen Evolution Reaction in Seawater