Micro-structural optimization of supported γ-alumina membranes

Kuzniatsova, T.; Mottern, Matthew L.; Shqau, Krenar; Yu, Di; Verweij, H.

doi:10.1016/j.memsci.2007.11.047

Cited by 34 publications

(31 citation statements)

References 29 publications

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“…The number of comprehensive studies describing the design/characterization/stabilization of mesoporous cAl 2 O 3 membrane pore structures as well as their gas transport properties has increased significantly with the synthesis of stable boehmite sols over the past three decades [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The pore structure characteristics, molecular properties of gaseous species and their interactions with the pore walls are some of the important factors for gaseous transport through porous membranes.…”

Section: Introductionmentioning

confidence: 99%

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Sol–gel derived mesoporous and microporous alumina membranes

Topuz

Çiftçioğlu

2010

J Sol-Gel Sci Technol

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Stable polymeric and colloidal boehmite sols were prepared by sol-gel process through controlled hydrolysis/condensation reactions. The particle sizes of the colloidal sols were in the 12-25 nm range depending on the process parameters and about 2 nm for polymeric sols. The presence of a significant increase in the microporosity content of the heat treated polymeric membranes relative to the mesoporous colloidal membranes might make the design of thermally stable microporous alumina membranes with controlled pore structures possible. The phase structure evolution in the 600-800°C range had shown that the crystallization of the gamma alumina in the amorphous matrix starts at about 800°C. This indicated that the pore structure stability may be enhanced through processing up to this relatively high temperature in polymeric alumina derived unsupported membranes. The permeance values of the two and three layered colloidal alumina membranes were observed to be independent of pressure which implies that the dominant gas transport mechanism is Knudsen diffusion in these structures. This was also supported by the 2.8 nm BJH pore sizes of the colloidal membranes. The Knudsen diffusion equation derived permeances of the polymeric alumina membranes with thicknesses of about 300 nm were determined to be very close to the experimentally determined permeance values.

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Section: Introductionmentioning

confidence: 99%

“…Kuzniatsova et al [12] compared the microstructural integrity of alumina membranes derived from unpurified and purified boehmite sols. Different techniques have been employed for the purification of sols including high speed centrifugation and ultrasound-assisted screening.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel derived mesoporous and microporous alumina membranes

Topuz

Çiftçioğlu

2010

J Sol-Gel Sci Technol

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“…As mentioned before, the c-alumina membrane is considered potentially interesting for CO 2 separation. 2 The ratio of two pure gas permeabilities measured at the same temperature is the selectivity (or ideal separation factor) given by Selectivity i,j~P ermeability i Permeability j (2) Results and discussion…”

Section: Characterisationmentioning

confidence: 99%

“…1 A mesoporous (MEP) (2 nm,pore size,50 nm) calumina membrane has interesting characteristics in ion retention in aqueous solutions as well as in gas separation applications, making it a suitable membrane material. 2 However, the mesoporous c-alumina membrane has been used mainly for nanofiltration applications for the treatment of process, drinking and waste water streams so far. [3][4][5] For gas separation applications, mesoporous c-alumina membrane has been mostly used for Knudsen separation of isotopes and also as a supporting structure for thin gas purification microporous (0?5 nm,pore size,2 nm) membranes.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] For gas separation applications, mesoporous c-alumina membrane has been mostly used for Knudsen separation of isotopes and also as a supporting structure for thin gas purification microporous (0?5 nm,pore size,2 nm) membranes. 2 There are three major gas transport mechanisms through inorganic membranes, namely, Knudsen diffusion, molecular sieving and surface diffusion. In the Knudsen diffusion mechanism, gas molecules progress only by collisions with the pore wall after diffusing into the membrane pores.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, strength and CO₂separation characteristics ofα-alumina supportedγ-alumina thin film membrane

Abedini¹,

Parvin²,

Ashtari³

et al. 2013

Advances in Applied Ceramics

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In this work, a mesoporous c-Al 2 O 3 membrane was synthesised on an a-Al 2 O 3 substrate by a solgel dip coating process. The membranes were characterised using SEM, field emission SEM, Xray diffractometry and N 2 adsorption/desorption measurements (Brunauer-Emmett-Teller analyses). The characterisation results revealed that a flawless c-alumina membrane layer with 3?5 mm thickness and 2?1 nm average pore size was achieved. Subsequent separation tests indicated that CO 2 could be separated from N 2 by the mesoporous c-Al 2 O 3 membrane. In spite of the difficulties of the separation, the optimised microstructure achieved for the prepared membrane led to desirable and regular permeation behaviour. It was also observed that separation could be more efficient in high pressure permeation conditions. The prepared substrate fulfilled the required strength and permeability for the thin c-Al 2 O 3 membrane film under these conditions. Accordingly, an optimised completely ceramic membrane structure, applicable for CO 2 separation applications, was achieved.

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Intermittent ultrasound‐assisted ceramic membrane fouling control in ultrafiltration

2020

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Ultrafiltration is one of the most promising membrane technologies for liquid purification due to its high economic efficiency in the industries. However, it has been faced with a critical problem, called fouling. The contaminants in feed solution tend to accumulate on the membrane surface, hindering permeate solution to pass through the porous spaces. Among the various solutions, application of ultrasound has been considered as the most popular method since it does not suffer a disadvantage of downtime and the filtration process does not need to be stopped for the removal of foulants. In this study, control of ceramic membrane fouling by an on-line intermittent

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Micro-structural optimization of supported γ-alumina membranes

Cited by 34 publications

References 29 publications

Sol–gel derived mesoporous and microporous alumina membranes

Sol–gel derived mesoporous and microporous alumina membranes

Microstructure, strength and CO₂separation characteristics ofα-alumina supportedγ-alumina thin film membrane

Intermittent ultrasound‐assisted ceramic membrane fouling control in ultrafiltration

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Micro-structural optimization of supported γ-alumina membranes

Cited by 34 publications

References 29 publications

Sol–gel derived mesoporous and microporous alumina membranes

Sol–gel derived mesoporous and microporous alumina membranes

Microstructure, strength and CO2separation characteristics ofα-alumina supportedγ-alumina thin film membrane

Intermittent ultrasound‐assisted ceramic membrane fouling control in ultrafiltration

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Product

Resources

About

Microstructure, strength and CO₂separation characteristics ofα-alumina supportedγ-alumina thin film membrane