Selective separation of lithium from high Mg/Li ratio brine using single-stage and multi-stage selective electrodialysis processes

Charge-governed ion transport is of significant importance to industrial development, and advanced membrane materials with fast and selective ionic transport are essential components. In cell membranes, ionic transport is mainly determined by the charge-governed protein channels, representing an architecture with functional differentiation. Inspired by this, a novel class of membranes was developed by ionically crosslinking sulfonated (poly[ether ether ketone]) and quaternized poly (2,6-dimethyl-1,4-phenylene oxide) to construct the cationic conductive biomimetic nanochannels. Ionic crosslinking was tailored to realize nanophase separation and efficient ion transport mainly based on surface chemistry without altering the scaffold feature of polymeric pore channels. The best-performing ionic crosslinking membrane exhibited a high ionic permeation (2.23 molÁm À2 Áh À1 for K + ) and high cationic selectivity (7.91 for K + /Mg 2+ ), which were comparable with the commercial monovalent cation permselective CIMS membrane, owing to the negligent surface resistance toward monovalent cations but strong positively charged repulsion against divalent cations.

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“…The current efficiency (

normalη

) was calculated as follows 41 :

η goodbreak= F \sum ((), z_{i} goodbreak\times J_{i}) / I goodbreak\times 100 %,

where z i is the charge number; I and F are the ED current (141 mA) and Faraday constant (96,485 C·mol −1 ), respectively.…”

Section: Methodsmentioning

confidence: 99%

Highly efficient monovalent ion transport enabled by ionic crosslinking‐induced nanochannels

et al. 2022

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“…Compared to the AHA membrane, the ASV membrane with a highly cross-linked layer has higher monovalent anion selectivity, which can be used to separate ions with different hydrated radii. 28 The main properties of the ion exchange membranes are listed in Table S1. Deionized water (Milli-Q, Merck Millipore) was used in all experiments.…”

Section: Methodsmentioning

confidence: 99%

Recovery of Fluoride-Rich and Silica-Rich Wastewaters as Valuable Resources: A Resource Capture Ultrafiltration–Bipolar Membrane Electrodialysis-Based Closed-Loop Process

Qiu

Ren

Xia

et al. 2022

Environ. Sci. Technol.

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Traditional technologies such as precipitation and coagulation have been adopted for fluoride-rich and silica-rich wastewater treatment, respectively, but waste solid generation and low wastewater processing efficiency are still the looming concern. Efficient resource recovery technologies for different wastewater treatments are scarce for environment and industry sustainability. Herein, a resource capture ultrafiltration–bipolar membrane electrodialysis (RCUF-BMED) system was designed into a closed-loop process for simultaneous capture and recovery of fluoride and silica as sodium silicofluoride (Na2SiF6) from mixed fluoride-rich and silica-rich wastewaters, as well as achieving zero liquid discharge. This RCUF-BMED system comprised two key parts: (1) capture of fluoride and silica from two wastewaters using acid, and recovery of the Na2SiF6 using base by UF and (2) UF permeate conversion for acid/base and freshwater generation by BMED. With the optimized RCUF-BMED system, fluoride and silica can be selectively captured from wastewater with removal efficiencies higher than 99%. The Na2SiF6 recovery was around 72% with a high purity of 99.1%. The aging and cyclic experiments demonstrated the high stability and recyclability of the RCUF-BMED system. This RCUF-BMED system has successfully achieved the conversion of toxic fluoride and silica into valuable Na2SiF6 from mixed wastewaters, which shows great application potential in the industry–resource–environment nexus.

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“…Therefore, the use of highly selective membranes in ED requires to determine the value of the limiting current density in operando to check that the current density is always lower than the limiting current density. Monitoring the ionic conductivity in the diluate is then not sufficient and the main challenge is therefore to monitor the limiting current over time [23][24][25].…”

Section: Initial Composition Of Thementioning

confidence: 99%

Application of Electrodialysis for the Selective Lithium Extraction Towards Cobalt, Nickel and Manganese from Leach Solutions Containing High Divalent Cations/Li Ratio

Gmar

Chagnes

Lutin³

et al. 2022

Recycling

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The present work aims at investigating the potentialities of implementation of electrodialysis for the recycling of spent lithium-ion batteries. In this work, the use of highly-selective membrane toward lithium(I) in electrodialysis was investigated to recover selectively lithium(I) toward cobalt(II), nickel(II) and manganese(II) by means of monovalent ion-selective membranes. It was shown that the presence of divalent cations in the leach solution is responsible for a significant decrease of the limiting current despite an increase in ionic conductivity. Therefore, monitoring the ionic conductivity was not sufficient to operate electrodialysis under optimal conditions, especially when highly selective membranes were used. Furthermore, it was demonstrated that the current has to be lower than the limiting current to avoid metal hydroxide precipitation into the membrane porosity by monitoring the limiting current over time.

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Selective separation of lithium from high Mg/Li ratio brine using single-stage and multi-stage selective electrodialysis processes

Cited by 57 publications

References 48 publications

Highly efficient monovalent ion transport enabled by ionic crosslinking‐induced nanochannels

Highly efficient monovalent ion transport enabled by ionic crosslinking‐induced nanochannels

Recovery of Fluoride-Rich and Silica-Rich Wastewaters as Valuable Resources: A Resource Capture Ultrafiltration–Bipolar Membrane Electrodialysis-Based Closed-Loop Process

Application of Electrodialysis for the Selective Lithium Extraction Towards Cobalt, Nickel and Manganese from Leach Solutions Containing High Divalent Cations/Li Ratio

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