Transport characteristics of liquid-gas interface in a capillary membrane pore

Chamani, Hooman; Matsuura, Takeshi; Rana, Dipak; Lan, Christopher Q.

doi:10.1016/j.memsci.2020.118387

Cited by 23 publications

(14 citation statements)

References 24 publications

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“…Figure shows the separation mechanism of the mushroom chitin membrane, especially for the oil/water emulsion filtration. Previous studies hinted that pore geometries play an important role in oil/water separation and pore size distribution measurements since pore geometries govern the initial liquid wetting critical for separation and pore characterization. − In this research, we also propose that the tortuous pore structures and wider pore size distribution created by freeze-thaw treatments affect the separation performance of the mushroom chitin membranes. Due to chitin’s complex pore structure and hydrophilic nature, mushroom chitin membranes show good separation performance and reusability.…”

Section: Resultsmentioning

confidence: 67%

Reusable and Biodegradable Separation Membranes Prepared from Common Mushrooms for the Removal of Oily and Particulate Contaminants from Water

Park

Kim

et al. 2023

ACS Appl. Bio Mater.

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Mushroom chitin membranes with controllable pore structures were fabricated through a simple process with naturally abundant Agaricus bisporus mushrooms. A freeze-thaw method was applied to alter the pore structures of the membranes, which consist of chitin fibril clusters within the glucan matrix. With tunable pore size and distribution, mushroom chitin membranes could effectively separate stable oil/water emulsions (dodecane, toluene, isooctane, and chili oil) with various chemical properties and concentrations and particle contaminants (carbon black and microfibers) from water. Chitin fibrils tightly pack with each other to form a dense membrane, leading to no permeation of contaminants or water. An increasing number of applied freezethaw cycles confers more tortuous pore structures throughout the mushroom chitin membranes, leading to higher flux while maintaining rejection performance. The 3D simulation constructed by the X-ray computed tomography and GeoDict software also demonstrated capturing a considerable amount of contaminants within the membranes' pores, which can be easily removed by water rinsing for further successive filtration. Furthermore, mushroom chitin membranes were almost completely biodegraded after approximately a month of being buried in the soil or kept in a lysozyme solution while possessing mechanical durability demonstrated by consistent filtration performance for repeated usage up to 15 cycles under ambient and external pressure. This research is a proof of concept that mushroom-derived chitin develops functional and biodegradable materials for environmental applications with scalability.

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Section: Resultsmentioning

confidence: 67%

Reusable and Biodegradable Separation Membranes Prepared from Common Mushrooms for the Removal of Oily and Particulate Contaminants from Water

Park

Kim

et al. 2023

ACS Appl. Bio Mater.

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“…The water contact angles of the B-PI, 6F-PI, and P-PI membranes were 103.8°, 94.0°, and 94.9°, respectively, whereas the DES contact angles of the corresponding ones were 74.3°, 68.8°, and 70.9°, respectively (Figure c). A lower contact angle generally indicates higher affinity and surface energy and a greater tendency for DES/water to wet the membrane, which might contribute to the swelling phenomena in the PI membranes. , Smaller contact angle was found in the DES than in aqueous system, indicating that the PI membranes had a better affinity to DES than water, as a result of the large amount of hydrogen bonding networks in the DES system …”

Section: Resultsmentioning

confidence: 99%

“…A lower contact angle generally indicates higher affinity and surface energy and a greater tendency for DES/water to wet the membrane, which might contribute to the swelling phenomena in the PI membranes. 43,44 Smaller contact angle was found in the DES than in aqueous system, indicating that the PI membranes had a better affinity to DES than water, as a result of the large amount of hydrogen bonding networks in the DES system. 45 The rejection and antifouling properties of the membranes are closely related to surface charge.…”

Section: Membrane Morphology and Porementioning

confidence: 99%

Acid-Resistant Polyimide Ultrafiltration Membranes for Direct Separation of Lignin from Deep Eutectic Solvents

Li,

Lu,

Sang

et al. 2023

ACS Appl. Polym. Mater.

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Direct separation of lignin from fully acidic deep eutectic solvent (DES) is challenging because of its high viscosity and acidity. In this study, three synthesized DES-resistant polyimides (PIs), namely, B-PI, 6F-PI, and P-PI based on 4′,6-diamidino-2-phenylindole (DAPI) with 4,4′-(4,4′-isopropylidenediphenoxy)bis-(phthalic anhydride) (BPADA), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and pyromellitic dianhydride (PMDA), respectively, were used to prepare ultrafiltration (UF) membranes for the direct separation of sodium lignosulfonate (LS) from its DES (choline chloride:lactic acid) solutions for the first time. The morphology, pore size, surface property, degree of swelling, LS separation performance, and long-term stability of the resulting UF membranes were investigated in detail. The average pore sizes were in the range of 3.60–5.06 nm, and the LS rejections, as well as the DES fluxes, were 44.0–66.4% and 4.71–16.55 L·m–2 h–1, respectively, both higher than those from commercial ZrO2/TiO2 membrane (25.6% and 1.91 L·m–2 h–1). Among them, the B-PI membrane had the best separation performance and excellent operating stability for 20 h due to its low fractional free volume and poor affinity with DES. Swelling and positive charges of membrane surface in the DES system decreased LS rejection. In addition, a higher degree of swelling and affinity with DES led to an increased DES flux when compared with the aqueous system. Herein the PI-based UF membranes are promising for the direct lignin separation process, especially in an acidic DES system.

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“…Various analytical methods are adopted by several researchers to determine the pore size distribution of the membranes. [50][51][52][53][54] In the present work, surface pore area distribution and pore diameter of untreated and plasma treated membranes is investigated using the Barett-Joyner-Halenda (BJH) method at 77k (Model: Quantachrome iQautosorb analyzer, Anton-Paar, India).…”

Section: Pore Characterizationmentioning

confidence: 99%

Flux enhancement of cellulose nitrate membrane through plasma assisted route for waste and mud water treatment

Hazarika,

Das,

Jose

et al. 2023

Polymers for Advanced Techs

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Fouling of polymeric membranes is a common problem due to its hydrophobic nature. Plasma assisted surface modification of polymeric membranes are immensely popular method in particular for the improvement of antifouling and adhesive properties. The effect of low‐pressure nitrogen plasma on surface morphology, hydrophilicity, structure, permeate flux and ageing effect for the cellulose nitrate polymer membrane are studied in the present work. The cylindrical Langmuir probe and optical emission spectroscopy are used to characterize the plasma. The macro void creation and pore enlargement effects have been observed from scanning electron microscopy images due to the surface etching of the membrane after plasma treatment. The atomic force microscopy analysis shows a prominent enhancement of the surface roughness of the plasma treated membrane. Wettability of membrane is studied as a function of plasma treatment time for treated and untreated membrane. From the contact angle measurement, it is found that the hydrophilicity of the plasma treated membranes increases with plasma treatment time. From gravity filtration process, the enhancement of permeate flux for both waste water and mud water are observed after plasma treatment. The ageing mechanism of the treated membranes is investigated for 30 days for different plasma treatment time. The hydrophobic recovery of plasma treated membranes is significant for initial ageing period of 7 days, after that it has shown almost stable in nature. A theoretical model is developed to study the hydrophilic recovery of plasma treated membranes. It is observed that the experimental results show a very good agreement with the theoretical results.

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Transport characteristics of liquid-gas interface in a capillary membrane pore

Cited by 23 publications

References 24 publications

Reusable and Biodegradable Separation Membranes Prepared from Common Mushrooms for the Removal of Oily and Particulate Contaminants from Water

Reusable and Biodegradable Separation Membranes Prepared from Common Mushrooms for the Removal of Oily and Particulate Contaminants from Water

Acid-Resistant Polyimide Ultrafiltration Membranes for Direct Separation of Lignin from Deep Eutectic Solvents

Flux enhancement of cellulose nitrate membrane through plasma assisted route for waste and mud water treatment

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