Unprecedented preparation of porous Matrimid® 5218 membranes

Russo, Francesca; Castro-Muñoz, Roberto; Galiano, Francesco; Figoli, Alberto

doi:10.1016/j.memsci.2019.05.036

Cited by 71 publications

(35 citation statements)

References 43 publications

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“…This BTDA-DAPI, also known as Matrimid R 5218, is a commercialized PI obtained by polycondensation polymerization of 3,3 ′ ,4,4 ′ -benzophenone tetracarboxylic dianhydride (BTDA) and a mixture of two cycloaliphatic monomers such as 5,6-amino-1-(4 ′ -aminophenyl)-1,3,3trimethylindane, producing BTDA-DAPI (Guiver et al, 2002). Thanks to its high chemical resistance, excellent adhesion, high solubility in many organic solvents, and good thermal stability (T g around 305-315 • C), Matrimid R is so far the most explored polymer for GS (Castro-Muñoz et al, 2018d) and some other applications in the membrane technology area, such as ultrafiltration (Russo et al, 2019), pervaporation (Castro-Muñoz et al, 2018a, 2019b, and membrane distillation (Xu et al, 2012).…”

Section: Toward the Tuning Of Chemical Properties Of Fillers In Pi-bamentioning

confidence: 99%

Tuning of Nano-Based Materials for Embedding Into Low-Permeability Polyimides for a Featured Gas Separation

2020

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Several concepts of membranes have emerged, aiming at the enhancement of separation performance, as well as some other physicochemical properties, of the existing membrane materials. One of these concepts is the well-known mixed matrix membranes (MMMs), which combine the features of inorganic (e.g., zeolites, metal-organic frameworks, graphene, and carbon-based materials) and polymeric (e.g., polyimides, polymers of intrinsic microporosity, polysulfone, and cellulose acetate) materials. To date, it is likely that such a concept has been widely explored and developed toward low-permeability polyimides for gas separation, such as oxydianiline (ODA), tetracarboxylic dianhydride-diaminophenylindane (BTDA-DAPI), m-phenylenediamine (m-PDA), and hydroxybenzoic acid (HBA). When dealing with the gas separation performance of polyimide-based MMMs, these membranes tend to display some deficiency according to the poor polyimide-filler compatibility, which has promoted the tuning of chemical properties of those filling materials. This approach has indeed enhanced the polymer-filler interfaces, providing synergic MMMs with superior gas separation performance. Herein, the goal of this review paper is to give a critical overview of the current insights in fabricating MMMs based on chemically modified filling nanomaterials and low-permeability polyimides for selective gas separation. Special interest has been paid to the chemical modification protocols of the fillers (including good filler dispersion) and thus the relevant experimental results provoked by such approaches. Moreover, some principles, as well as the main drawbacks, occurring during the MMM preparation are also given.

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Section: Toward the Tuning Of Chemical Properties Of Fillers In Pi-bamentioning

confidence: 99%

Tuning of Nano-Based Materials for Embedding Into Low-Permeability Polyimides for a Featured Gas Separation

2020

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“…The exposure of the cast film to a humid environment promoted the formation of a more porous structure on the surface while, along the cross-section, it favored the formation a spongy architecture. The porogen effect of humidity is a quite well studied phenomenon and it is related to the adsorption, by the cast film, of water molecules from the humid air, which delays the phase-inversion process, fostering the creation of a porous and sponge-like structure [ 25 , 62 , 63 , 64 , 65 ].…”

Section: Resultsmentioning

confidence: 99%

Polyvinylidene Fluoride-Graphene Oxide Membranes for Dye Removal under Visible Light Irradiation

et al. 2020

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In this study, polyvinylidene fluoride (PVDF)-graphene oxide (GO) membranes were obtained by employing triethyl phosphate (TEP) as a solvent. GO nanosheets were prepared and characterized in terms of scanning and transmission electron microscopy (SEM and TEM, respectively), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), chemical analysis and inductively coupled plasma mass spectroscopy (ICP). Two different phase inversion techniques, Non-Solvent Induced Phase Separation (NIPS) and Vapour-Induced Phase Separation (VIPS)/NIPS, were applied to study the effect of fabrication procedure on the membrane structure and properties. Membranes were characterized by SEM, AFM, pore size, porosity, contact angle and mechanical tests, and finally tested for photocatalytic methylene blue (MB+) degradation under visible light irradiation. The effect of different pH values of dye aqueous solutions on the photocatalytic efficiency was investigated. Finally, the influence of NaCl salt on the MB+ photodegradation process was also evaluated.

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“…As reported in Table 2 , molecular sieving, based on the difference of size and molecular weight, is recognized as the main separation mechanism in these processes. However, the membrane pore size is not the only parameter that influences on the performance of a membrane, there are also other factors that play an important role in the operation of a membrane process, as follows: Asymmetry properties of a membrane : In the case of polymer membranes, phase inversion technique is commonly used for the preparation of porous membranes [ 20 ]. Such a fabrication protocol often, depending on the type of method and conditions, generates asymmetric properties on the resulting membranes, which means that the membrane does not present a uniform pore size over the membrane structure.…”

Section: Principles Of Membrane-based Processes and Factors Influencing Their Performancementioning

confidence: 99%

“…Asymmetry properties of a membrane : In the case of polymer membranes, phase inversion technique is commonly used for the preparation of porous membranes [ 20 ]. Such a fabrication protocol often, depending on the type of method and conditions, generates asymmetric properties on the resulting membranes, which means that the membrane does not present a uniform pore size over the membrane structure.…”

Section: Principles Of Membrane-based Processes and Factors Influencing Their Performancementioning

confidence: 99%

Membrane-Based Harvesting Processes for Microalgae and Their Valuable-Related Molecules: A Review

Castro-Muñoz

García‐Depraect

2021

Membranes

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The interest in microalgae production deals with its role as the third generation of feedstock to recover renewable energy. Today, there is a need to analyze the ultimate research and advances in recovering the microalgae biomass from the culture medium. Therefore, this review brings the current research developments (over the last three years) in the field of harvesting microalgae using membrane-based technologies (including microfiltration, ultrafiltration and forward osmosis). Initially, the principles of membrane technologies are given to outline the main parameters influencing their operation. The main strategies adopted by the research community for the harvesting of microalgae using membranes are subsequently addressed, paying particular attention to the novel achievements made for improving filtration performance and alleviating fouling. Moreover, this contribution also gives an overview of the advantages of applying membrane technologies for the efficient extraction of the high added-value compounds in microalgae cells, such as lipids, proteins and carbohydrates, which together with the production of renewable biofuels could boost the development of more sustainable and cost-effective microalgae biorefineries.

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Unprecedented preparation of porous Matrimid® 5218 membranes

Cited by 71 publications

References 43 publications

Tuning of Nano-Based Materials for Embedding Into Low-Permeability Polyimides for a Featured Gas Separation

Tuning of Nano-Based Materials for Embedding Into Low-Permeability Polyimides for a Featured Gas Separation

Polyvinylidene Fluoride-Graphene Oxide Membranes for Dye Removal under Visible Light Irradiation

Membrane-Based Harvesting Processes for Microalgae and Their Valuable-Related Molecules: A Review

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