A metrics-based approach to preparing sustainable membranes: application to ultrafiltration

Prézélus, Flavie; Chabni, Dihia; Tiruta-Barna, Ligia; Guigui, Christelle; Rémigy, Jean-Christophe

doi:10.1039/c9gc01178a

Cited by 25 publications

(18 citation statements)

References 67 publications

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“… 5 In their detailed review, several solvents were evaluated as promising candidates to replace these harmful solvents; however, most of the alternatives come with their own downsides. Specifically, some of the alternatives are unable to dissolve the desired polymers at high concentrations; 6 others are expensive (e.g., ionic liquids), are produced by using limited natural resources (e.g., solvents containing phosphorus), or have problematic hazardous properties (e.g., ionic liquids and dimethyl sulfoxide). 5 Finally, the solvents should ideally be recyclable and should thus be easy to separate from the nonsolvent water after membrane formation.…”

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Durmaz

Baig

Willott

et al. 2020

ACS Appl. Polym. Mater.

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Polymeric membranes are used on very large scales for drinking water production and kidney dialysis, but they are nearly always prepared by using large quantities of unsustainable and toxic aprotic solvents. In this study, a water-based, sustainable, and simple way of making polymeric membranes is presented without the need for harmful solvents or extreme pH conditions. Membranes were prepared from water-insoluble polyelectrolyte complexes (PECs) via aqueous phase separation (APS). Strong polyelectrolytes (PEs), poly(sodium 4-styrenesulfonate) (PSS), and poly(diallyldimethylammonium chloride) (PDADMAC) were mixed in the presence of excess of salt, thereby preventing complexation. Immersing a thin film of this mixture into a low-salinity bath induces complexation and consequently the precipitation of a solid PEC-based membrane. This approach leads to asymmetric nanofiltration membranes, with thin dense top layers and porous, macrovoid-free support layers. While the PSS molecular weight and the total polymer concentrations of the casting mixture did not significantly affect the membrane structure, they did affect the film formation process, the resulting mechanical stability of the films, and the membrane separation properties. The salt concentration of the coagulation bath has a large effect on membrane structure and allows for control over the thickness of the separation layer. The nanofiltration membranes prepared by APS have a low molecular weight cutoff (<300 Da), a high MgSO 4 retention (∼80%), and good stability even at high pressures (10 bar). PE complexation induced APS is a simple and sustainable way to prepare membranes where membrane structure and performance can be tuned with molecular weight, polymer concentration, and ionic strength.

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Section: Introductionmentioning

confidence: 99%

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Durmaz

Baig

Willott

et al. 2020

ACS Appl. Polym. Mater.

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“…1,2 Recently, increasing attention has been given to making membrane production processes more sustainable. The use of alternative solvents has been discussed in great detail, [3][4][5] where toxic organic solvents are replaced with greener alternatives with much of this research focused on the effect of these alternative solvents on membrane structure. More recently, the Aqueous Phase Separation (APS) approach has been introduced in which polymeric membranes are formed in aqueous media, with the aim of completely eliminating the use of the organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Tuning the charge of polyelectrolyte complex membranes preparedviaaqueous phase separation

et al. 2021

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“…The contribution of solvent fabrication to fossil depletion can be related to the petrochemical origin of NMP, which is obtained from the reaction between gamma-butyrolactone and methylamine [31]. Opportunities for a biosourced solvent such as, for example, methyl lactate [7] could be considered to reduce fossil depletion. The ReCiPe endpoint score also concerns climate change related to both the ecosystem quality and rates, fluid temperatures and electric power of devices were measured.…”

Section: Total Impacts For 1 M 2 Membranementioning

confidence: 99%

“…The industrial process can be divided into three stages: hollow fiber spinning, module preparation and module testing [2]. Although research on the understanding of phase inversion mechanisms dates back to the 1960s [3,4], environmental concerns related to membrane fabrication is still in its recent years and research efforts are essentially focused on substituting toxic solvents [5][6][7] and petrochemical-based polymers [8][9]. As fleshed out in the followings, a comprehensive and rigorous approach to determine the influence of operating conditions and raw materials on the induced environmental impacts is missing in the literature.…”

Section: Introductionmentioning

confidence: 99%

A generic process modelling – LCA approach for UF membrane fabrication: Application to cellulose acetate membranes

Prézélus

Tiruta-Barna

Guigui

et al. 2021

Journal of Membrane Science

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The purpose of the research is to elaborate and implement a decision-making tool for greener membrane fabrication. The scientific novelty put forth in this study is the generic process modelling -LCA approach applied to the field. The resulting parameterized model allows to obtain material and energy flows as a function of operating conditions for ultrafiltration hollow fibers prepared by non-solvent induced phase separation. Its modular configuration allows for flexibility and adaptation to various membrane materials and industrial practices. Contributions of inputs on environmental impacts can be assessed, as well as the influence of operating conditions. Results for cellulose acetate membranes show major contributions of NMP (i.e. solvent) and glycerol (i.e. pre-conditioning liquid). Improvement strategies for environmental mitigation include acting on glycerolrelated operating conditions and are to be considered within the geographic context of membrane fabrication; further technical and economic feasibility studies would embed these strategies in a full eco-design approach. Such a methodology and results should be taken into account for the elaboration of "green membranes" whatever the application and coupled with the impact of membrane use and end-of-life.

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A metrics-based approach to preparing sustainable membranes: application to ultrafiltration

Abstract: Developing a metrics-based methodological approach that considers technical, environmental, health and safety issues to assess sustainability of membrane fabrication.

Cited by 25 publications

References 67 publications

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Tuning the charge of polyelectrolyte complex membranes preparedviaaqueous phase separation

A generic process modelling – LCA approach for UF membrane fabrication: Application to cellulose acetate membranes

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