Ultraefficient Li + /Mg 2+ Separation with Mxene/Cnt Membranes Under Electric Field Assistance
SSRN, ISSN: 1556-5068
2023
- 113Usage
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
Similar physicochemical properties render the separation of Li+/Mg2+ from salt lake brine difficult for two-dimensional (2D) membranes. Herein, ultraefficient Li+/Mg2+ separation was achieved under the influence of an electric field using MXene/carbon nanotube (CNT) membranes developed on tubular ceramic substrates via thermal crosslinking. Crosslinking reactions between CNTs and MXene yielded well–intercalated CNTs between MXene nanosheets, forming antiswelling MXene/CNT membranes (MCMs) (interlayer spacing: 8.04 Å) suitable for Li+/Mg2+ separation. At 2.8 V applied voltage, the MCMs exhibited Li+ flux of 0.0491 mol m−2 h−1 and high Li+/Mg2+ selectivity of 54.5, which outperform existing state–of–the–art 2D membranes. Specifically, under a positive electric field, Li+ with a small hydration diameter and low hydration energy permeated through the membrane nanochannels more easily than Mg2+, increasing and decreasing Li+ and Mg2+ flux, respectively. Additionally, Mg2+ retention was enhanced via the complexation of enriched Mg2+ with hydroxyl groups on the MXene membrane surface. The MXene membrane surface was thus reconfigured to be positively charged, inducing effective Mg2+ rejection. This study offers a novel and practical approach for efficiently separating Li+/Mg2+ as well as monovalent/multivalent ions.
Bibliographic Details
Elsevier BV
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