Self-assembled sandwich-like SA–GO/PAN membranes with high-performance for pervaporative desalination of salt solutions

Bao, Cun; Yuan, Haikuan; Huang, Fuqing; Shi, Jianghuan; Hao, Ruiran; Zhang, Yadi; Chen, Xinyi; Lü, Jie

doi:10.1007/s13726-023-01202-8

Cited by 3 publications

(6 citation statements)

References 67 publications

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“…It confirms the covalent cross-linking reaction, presented in Figure 12. NMR spectra of 23 Na and 13 C nuclei of the membranes studied are shown in Figure 13. NMR spectra of 23 Na and 13 C nuclei of the membranes studied are shown in Figure 13.…”

Section: Investigation Of Membranes By Spectroscopic Methodsmentioning

confidence: 99%

“…The NMR spectra of 23 Na nuclei for all membranes have one visible line around −9.5 ppm (Figure 13a), which corresponds to sodium ions of SA. It can be noted that the spectrum for the SA-5 membrane is noticeably narrowed and shifted.…”

Section: Investigation Of Membranes By Spectroscopic Methodsmentioning

confidence: 99%

“…Based on the results obtained by the computational experiment, such a shift may be explained by the formation of sodium coordination clusters, where the sodium atom acts as a coordination center between the Figure 13. The NMR spectra for (a) 23 Na and (b) 13 C nuclei.…”

Section: Investigation Of Membranes By Spectroscopic Methodsmentioning

confidence: 99%

“…To investigate 13 C nuclei, a Larmor frequency of 100.64 MHz and tetramethylsilane (TMS) as an external reference were applied. For 23 Na nuclei, a Larmor frequency of 105.87 MHz and liquid 1M•D 2 O NaCl as an external reference were applied.…”

Section: Nuclear Magnetic Resonance Spectroscopy (Nmr)mentioning

confidence: 99%

“…Two-dimensional (2D) materials such as GO are attracting growing interest as modifiers in membrane separations for the dehydration of organics [20]. GO and its derivatives have been actively used to modify alginate-based membranes for pervaporation desalination [23,24] and dehydration of alcohols [25][26][27][28][29][30], where it showed potential for use. The modification of SA and PEC-based membranes with carbon nanoparticles of GO would significantly change the morphology of the polymer matrix, the surface hydrophilicity of a membrane, and the free volume between the chains of polymers.…”

Section: Introductionmentioning

confidence: 99%

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Pervaporation Membranes Based on Polyelectrolyte Complex of Sodium Alginate/Polyethyleneimine Modified with Graphene Oxide for Ethanol Dehydration

Dmitrenko,

Mikhailovskaya,

Dubovenko

et al. 2024

Polymers

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Pervaporation is considered the most promising technology for dehydration of bioalcohols, attracting increasing attention as a renewable energy source. In this regard, the development of stable and effective membranes is required. In this study, highly efficient membranes for the enhanced pervaporation dehydration of ethanol were developed by modification of sodium alginate (SA) with a polyethylenimine (PEI) forming polyelectrolyte complex (PEC) and graphene oxide (GO). The effect of modifications with GO or/and PEI on the structure, physicochemical, and transport characteristics of dense membranes was studied. The formation of a PEC by ionic cross-linking and its interaction with GO led to changes in membrane structure, confirmed by spectroscopic and microscopic methods. The physicochemical properties of membranes were investigated by a thermogravimetric analysis, a differential scanning calorimetry, and measurements of contact angles. The theoretical consideration using computational methods showed favorable hydrogen bonding interactions between GO, PEI, and water, which caused improved membrane performance. To increase permeability, supported membranes without treatment and cross-linked were developed by the deposition of a thin dense layer from the optimal PEC/GO (2.5%) composite onto a developed porous substrate from polyacrylonitrile. The cross-linked supported membrane demonstrated more than two times increased permeation flux, higher selectivity (above 99.7 wt.% water in the permeate) and stability for separating diluted mixtures compared to the dense pristine SA membrane.

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