Dehydroxylation-assisted self-crosslinking of MXene-based pervaporation membranes for treating high-salinity water
Fareed H. Jang K. Lee W. Kim I.S. Han S.
25 March 2023Korean Society of Industrial Engineering Chemistry
Journal of Industrial and Engineering Chemistry
2023#119506 - 515 pp.
In this study, an additive-free self-crosslinking technique was optimized to prepare pervaporation desalination membranes for brine treatment. MXene-coated membranes that were about 100 nm thick were synthesized using the facile vacuum filtration technique. The MXene nanosheets were then crosslinked at different temperatures from 25 °C to 180 °C, inspired by weight loss through thermogravimetric analysis. The MXene membrane self-crosslinked at 140 ℃ (M140) proved to be the optimal membrane in terms of the permselectivity of brine with a stable d-spacing of 1.43 nm in distilled water and 1.48 nm in a 10 wt% NaCl solution. Fourier-transformed infrared spectroscopy and X-ray photoelectron spectroscopy revealed Ti[sbnd]O[sbnd]Ti bond formation induced by reverse hydrolysis of MXene, leading to increased surface roughness and decreased swelling tendency. M140 generated a permeation flux of 70 kg m-2h−1 with salt rejection up to 99.9 % for 100 g/L of NaCl solution at a feed temperature of 70 °C. Furthermore, M140, tested with simulated brine for a 48 h operation test, showed successful suppression of salt transport on the permeate side, while maintaining ∼ 50 kg m-2h−1 flux and 99.9 % salt rejection. M140 is recommended for pervaporation desalination, where a high salinity feed is expected.
Brine treatment , Desalination , MXene , Pervaporation , Self-crosslinking , Swelling
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School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, South Korea
Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals (Inn-ECOSysChem), Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, South Korea
Global Desalination Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, South Korea
Department of Civil and Environmental Engineering, National Lab. Astana, Nazarbayev University, 53 Kabanbay Batyr Ave., Nur-Sultan, 020000, Kazakhstan
School of Earth Sciences and Environmental Engineering
Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals (Inn-ECOSysChem)
Global Desalination Research Center
Department of Civil and Environmental Engineering
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