Green solvents for membrane manufacture: Recent trends and perspectives

Kim, Dooli; Nunes, Suzana Pereira

doi:10.1016/j.cogsc.2020.100427

Cited by 55 publications

(35 citation statements)

References 48 publications

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“…Some alternative solvents have been proposed to substitute DMF (by dimethyl sulfoxide) and 1,4-dioxane (by acetone) [30]. Green solvents, like methyl/ethyl lactate [31], ionic liquids [32][33][34], triethyl phosphate [35] and 𝛾-butyrolactone [36] have been proposed to substitute conventional solvents in phase inversion.…”

Section: Chemicalsmentioning

confidence: 99%

γ-Valerolactone as Bio-Based Solvent for Nanofiltration Membrane Preparation

Rasool

Vankelecom

2021

Membranes

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γ-Valerolactone (GVL) was selected as a renewable green solvent to prepare membranes via the process of phase inversion. Water and ethanol were screened as sustainable non-solvents to prepare membranes for nanofiltration (NF). Scanning electron microscopy was applied to check the membrane morphology, while aqueous rose Bengal (RB) and magnesium sulphate (MgSO4) feed solutions were used to screen performance. Cellulose acetate (CA), polyimide (PI), cellulose triacetate (CTA), polyethersulfone (PES) and polysulfone (PSU) membranes were fine-tuned as materials for preparation of NF-membranes, either by selecting a suitable non-solvent for phase inversion or by increasing the polymer concentration in the casting solution. The best membranes were prepared with CTA in GVL using water as non-solvent: with increasing CTA concentration (10 wt% to 17.5 wt%) in the casting solution, permeance decreased from 15.9 to 5.5 L/m2·h·bar while RB rejection remained higher than 94%. The polymer solubilities in GVL were rationalized using Hansen solubility parameters, while membrane performances and morphologies were linked to viscosity measurements and cloudpoint determination of the casting solutions to better understand the kinetic and thermodynamic aspects of the phase inversion process.

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Section: Chemicalsmentioning

confidence: 99%

γ-Valerolactone as Bio-Based Solvent for Nanofiltration Membrane Preparation

Rasool

Vankelecom

2021

Membranes

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“…are some of the ecologically promising technologies that have positively motivated the researchers. [ 15 ]…”

Section: Introductionmentioning

confidence: 99%

The Journey of Water Remediation through Biomimetic Strategies: A Mechanistic Insight

Gupta

Padmavathy

Bose

2021

Advanced Sustainable Systems

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Nature‐driven designs for water crisis have shown much interest in energy‐efficient water treatment. This review discusses four different bioinspired systems, aquaporin membranes, mussel‐inspired amine‐based membranes, supramolecular architectures, and cactus/mangrove desalination. The authors have also delineated their contributions and mechanisms toward forming water pathways for effective desalination. The discussion is mainly channelized toward constructing generic approaches based on membranes with diverse shapes and dimensions, including hierarchically structured membranes. The separation properties of these bioinspired systems stem from their chemical and physical structures imparting selectivity in the separation of ions, pollutants, etc. Further, this review covers the practical methodologies for next‐generation energy‐efficient membranes and outlines the perspectives regarding the upcoming developments in water technology.

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“…As of yet, a significant amount of research has already been performed toward using alternative safer and more sustainable solvents for membrane preparation [11][12][13]. This research partially focused on using less toxic solvents, for instance, dimethyl sulfoxide [14] and ionic liquids [15,16], but also on more sustainable solvents such as methyl lactate [17], and newly designed synthetic solvents [18,19].…”

Section: Introductionmentioning

confidence: 99%

Solvent and pH Stability of Poly(styrene-alt-maleic acid) (PSaMA) Membranes Prepared by Aqueous Phase Separation (APS)

2021

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In the single-polyelectrolyte aqueous phase separation (APS) approach, membranes are prepared by precipitating a weak polyelectrolyte from a concentrated aqueous solution using a pH switch. This has proven to be a versatile and more sustainable method compared to conventional approaches as it significantly reduces the use of organic solvents. Poly(styrene-alt-maleic acid) (PSaMA) is a polymer that has been extensively investigated for APS and has been the basis for both open and dense membranes with good performances. These membranes are chemically crosslinked and, in this work, we further investigated ultrafiltration (UF) and nanofiltration (NF) membranes prepared with PSaMA for their stability in various organic solvents and under different pH conditions. It was shown that these membranes had stable performances in both isopropanol (IPA) and toluene, and a slightly reduced performance in N-methyl-2-pyrollidone (NMP). However, PSaMA did not perform well as a selective layer in these solvents, indicating that the real opportunity would be to use the UF-type PSaMA membranes as solvent-stable support membranes. Additionally, the membranes proved to be stable in an acidic-to-neutral pH regime (pH 2–7); and, due to the pH-responsive nature of PSaMA, for the NF membranes, a pH-dependent retention of Mg2+ and SO42− ions was observed and, for the UF membranes, a strong responsive behavior was observed, where the pH can be used to control the membrane permeability. However, long-term exposure to elevated pH conditions (pH 8–10) resulted in severe swelling of the NF membranes, resulting in defect formation, and compaction of the UF membranes. For the UF membranes, this compaction did prove to be reversible for some but not all of the membrane samples measured. These results showed that in aqueous systems, membranes prepared with PSaMA had interesting responsive behaviors but performed best at neutral and acidic pH values. Moreover, the membranes exhibited excellent stability in the organic solvents IPA and toluene

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Green solvents for membrane manufacture: Recent trends and perspectives

Cited by 55 publications

References 48 publications

γ-Valerolactone as Bio-Based Solvent for Nanofiltration Membrane Preparation

γ-Valerolactone as Bio-Based Solvent for Nanofiltration Membrane Preparation

The Journey of Water Remediation through Biomimetic Strategies: A Mechanistic Insight

Solvent and pH Stability of Poly(styrene-alt-maleic acid) (PSaMA) Membranes Prepared by Aqueous Phase Separation (APS)

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