Preparation of water and alkali durable porous glass membrane coated on porous alumina tubing by sol-gel method

Yazawa, Tetsuo; Tanaka, Hiroshi; Nakamichi, Hiroshi; Yokoyama, Takuji

doi:10.1016/s0376-7388(00)81542-2

Cited by 31 publications

(14 citation statements)

References 6 publications

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“…In the figure, L from p inorganic reverse-osmosis membranes, whose pore diameters are estimated to be smaller than NF membranes, is also indi- L is normalized with that at 20ЊC for M3 and at 25ЊC p for M1 and M2, respectively; data relative to membrane Y Ž . was taken from Yazawa et al 1991 . Ž . cated Yazawa et al, 1991 .…”

Section: Temperature Dependency Of Nanofiltration Performancesmentioning

confidence: 99%

Temperature effect on transport performance by inorganic nanofiltration membranes

et al. 2000

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Section: Temperature Dependency Of Nanofiltration Performancesmentioning

confidence: 99%

Temperature effect on transport performance by inorganic nanofiltration membranes

et al. 2000

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“…Sol is coated on the outer surface or inner surface of a porous support tube, which has a large pore size, and becomes a gel after drying. By the conventional sol-gel method, which involves deposition of particulate sol and calcination at a relatively high temperature (above 573 K), it is difficult to obtain a porous membrane with pore size less than 2 nm [3].However, we found that microporous xerogel membrane with pore diameter less than 1 nm coated on porous glass support could be obtained by a novel sol-gel method. This xerogel, prepared by evaporation of solvent from wet gel, is distinguished from ordinary porous ceramic green bodies by its small pore size and correspondingly enormous surface area.…”

mentioning

confidence: 83%

Highly selective separation of CO2 and He by xerogel coated porous glass membrane

1996

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For the past decade, active research on inorganic membranes has been carried out. Inorganic membranes have many advantages compared with organic membranes due to their chemical and thermal stability and high mechanical strength.Almost all asymmetric membranes are made by the sol-gel method [1]. This method is based on the hydrolysis, condensation and polymerization of metal alkoxides following sintering [2]. Sol is coated on the outer surface or inner surface of a porous support tube, which has a large pore size, and becomes a gel after drying. By the conventional sol-gel method, which involves deposition of particulate sol and calcination at a relatively high temperature (above 573 K), it is difficult to obtain a porous membrane with pore size less than 2 nm [3].However, we found that microporous xerogel membrane with pore diameter less than 1 nm coated on porous glass support could be obtained by a novel sol-gel method. This xerogel, prepared by evaporation of solvent from wet gel, is distinguished from ordinary porous ceramic green bodies by its small pore size and correspondingly enormous surface area. This method is peculiar in its application of low water content and low heat treatment temperature. The gas selectivity factor (ratio of the permeation rate) of the membrane attained about 20 for the He/N 2 system and about 50 for the CO2/Na system at 298 K.In this letter, we report the preparation of this novel microporous xerogel membrane and its gas separation characteristics.Xerogel layer was prepared using the sol-gel method. The silicate sol composition was tetraethoxysilane (TEOS):C2HsOH:H20:HC1 = 1:20:2:0.01 in molar ratio. Commercially available reagent grade chemicals were used. The mixture was stirred for several hours at room temperature to obtain homogeneous sol. Porous glass tubes with pore diameter of 4 nm, outer diameter of 5 mm, inner diameter of 4 mm and length of approximately 12 cm were used as the support. Support tubes, with one end closed, were dipped in the sol, withdrawn at a rate of 3 mlTIS -1, then dried at room temperature. After the dip-coating procedure had been repeated three times, the tubes were heated to 423 K at a rate of 0.5 Kmin -I and maintained at that temperature for 2 h, then cooled to room temperature. These coating and heating procedures were repeated twice and final specimens were obtained. The membrane were stored 0261-8028

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“…This contrasts with other silica membranes. According to Yazawa et al [44], after reflux for 48 h in water, a porous glass membrane (pure silica) showed about 60% of SiO 2 elution by dissolving into water. It is clear that the porous glass (pure silica) membranes used in that study exhibited no thermal stability in aqueous solutions.…”

Section: Thermal Stability and Regeneration Of Btese Reverse Osmosis mentioning

confidence: 99%

“…The water flux dropped approximately 50% after 30 min and salt rejection decreased from 96.4% to 70.3%. The decrease in rejection was ascribed to the hydrophilic surface of the pure silica membrane while the drop in flux was probably because of the build-up of salt within the membrane pores due to pore wetting and subsequent evaporation [44].…”

Section: Thermal Stability and Regeneration Of Btese Reverse Osmosis mentioning

confidence: 99%

Robust organosilica membranes for high temperature reverse osmosis (RO) application: Membrane preparation, separation characteristics of solutes and membrane regeneration

Ibrahim

Nagasawa

Kanezashi

et al. 2015

Journal of Membrane Science

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a b s t r a c tA pore network of bis(triethoxysilyl)ethane (BTESE) organosilica membranes was controlled by adjusting the molar ratios of BTESE/H 2 O/acid ¼ 1/x/0.2 (x ¼3 and 240). The mechanisms for solute transport in the BTESE RO membrane were investigated using three different aqueous solutions of sodium chloride (NaCl), ethanol (EtOH) and isopropanol (IPA). The pressure and temperature were varied from 0.4 to 1 MPa and from 25 to 80°C, respectively. Water flux and rejection increased for both alcohols and electrolyte with an increase in the applied pressure. It was noteworthy that the rejection of alcohols decreased with an increase in the RO operating temperature, while the electrolyte rejection remained almost constant. The BTESE membranes exhibited high thermal robustness under the long-term testing conditions, delivering salt rejections 498% until the end of the testing period (50 h). The BTESE membranes could also be regenerated after use in the gas and RO experiments, thus demonstrating robust properties.

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Preparation of water and alkali durable porous glass membrane coated on porous alumina tubing by sol-gel method

Cited by 31 publications

References 6 publications

Temperature effect on transport performance by inorganic nanofiltration membranes

Temperature effect on transport performance by inorganic nanofiltration membranes

Highly selective separation of CO2 and He by xerogel coated porous glass membrane

Robust organosilica membranes for high temperature reverse osmosis (RO) application: Membrane preparation, separation characteristics of solutes and membrane regeneration

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