Reactive sintering and particle morphology control of β″-alumina-based water purification filters

Fukui, Kazuki; Suzuki, Yoshikazu

doi:10.1007/s10853-017-1599-z

Cited by 10 publications

(5 citation statements)

References 36 publications

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“…The characteristics of ceramic supports are largely determined by the shape, dimension, and distribution of powder particles in the starting materials, and the processing temperature. − Macroporous ceramic supports are generally composed of coarse ceramic particles, the stacking of which results in the large pores . An increase in particle size will correspondingly enlarge the mean pore size of the ceramic membrane support, which then improves the permeability.…”

Section: Resultsmentioning

confidence: 99%

Overcoming the Trade-off between Water Permeation and Mechanical Strength of Ceramic Membrane Supports by Interfacial Engineering

Kotobuki

Kirk

et al. 2021

ACS Appl. Mater. Interfaces

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Porous ceramic membrane supports with high mechanical strength and permeation are required for highly permeable ceramic membranes. The water permeation of a ceramic membrane support is largely dependent on its level of open porosity, which can be however generally detrimental to the mechanical strength. In this work, low-cost kaolin nanoflakes were rationally composited with coarse alumina particles, and multichannel flat-sheet ceramic supports were successfully fabricated by extrusion and subsequent partial sintering. The macroscopic properties, microstructure characteristics, permeability, and mechanical strength of the ceramic membrane supports were systematically established and comprehensively studied. The incorporation of kaolin nanoflakes effectively reduced the sintering temperature to about 1200 °C. An interesting evolution of the pore structure was evidenced with the increase in sintering temperature. Interestingly, the porous ceramic supports prepared at 1400 °C with a nominal pore size of 1.47 μm showed the highest water permeability of 9911.9 ± 357.5 LMHB, and at the same time the flexural strength reached 109.6 ± 4.6 MPa. The much improved permeability was attributed to the unique multilevel pore structures, and the enhanced flexural strength mainly originated from the strongly interfacial bonding, as evidenced by the trans-granular fracture behavior. Also, the ceramic membrane supports exhibited excellent chemical resistance and good removal efficiency for oily wastewater. This work highlights the significant role of interfacial engineering in simultaneously improving the water permeation and mechanical strength, thereby overcoming their trade-off in porous ceramic membrane supports.

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Section: Resultsmentioning

confidence: 99%

Overcoming the Trade-off between Water Permeation and Mechanical Strength of Ceramic Membrane Supports by Interfacial Engineering

Kotobuki

Kirk

et al. 2021

ACS Appl. Mater. Interfaces

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“…The initial amount of sodium of 13.4 mol-% (or 8.63 wt.-%) is based on the ideal structural formula of Na-β”-alumina (Na 2 O·5.33Al 2 O 3 ) and is limited by the solubility in the methanol-water solvent mixture [ 15 , 22 ]. The largest sodium loss (−6.23 wt.-%) occurs during sol-gel synthesis.…”

Section: Resultsmentioning

confidence: 99%

“…Only a few other publications are available on porous Na-β-alumina. For instance, Fukui et al [22] prepared a porous Na-β-alumina disc with a diameter of 15 mm via a solid-state reactive sintering process. The disc has a modal pore size of 630 nm with a pore volume of 0.20 cm 3 •g −1 , and total porosity of up to 58%.…”

Section: Introductionmentioning

confidence: 99%

“…The Na2O content is independent of the initial PEO content. PEO is virtually completely combusted during calcination, and the final carbon content amounts to only 0.22 wt.-% (±0.10%).The initial amount of sodium of 13.4 mol-% (or 8.63 wt.-%) is based on the ideal structural formula of Na-β"-alumina (Na2O•5.33Al2O3) and is limited by the solubility in the methanol-water solvent mixture[15,22]. The largest sodium loss (−6.23 wt.-%) occurs during sol-gel synthesis.…”

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Sodium Solid Electrolytes: NaxAlOy Bilayer-System Based on Macroporous Bulk Material and Dense Thin-Film

et al. 2021

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A new preparation concept of a partially porous solid-state bilayer electrolyte (BE) for high-temperature sodium-ion batteries has been developed. The porous layer provides mechanical strength and is infiltrated with liquid and highly conductive NaAlCl4 salt, while the dense layer prevents short circuits. Both layers consist, at least partially, of Na-β-alumina. The BEs are synthesized by a three-step procedure, including a sol-gel synthesis, the preparation of porous, calcined bulk material, and spin coating to deposit a dense layer. A detailed study is carried out to investigate the effect of polyethylene oxide (PEO) concentration on pore size and crystallization of the bulk material. The microstructure and crystallographic composition are verified for all steps via mercury intrusion, X-ray diffraction, and scanning electron microscopy. The porous bulk material exhibits an unprecedented open porosity for a NaxAlOy bilayer-system of ≤57% with a pore size of ≈200–300 nm and pore volume of ≤0.3 cm3∙g−1. It contains high shares of crystalline α-Al2O3 and Na-β-alumina. The BEs are characterized by impedance spectroscopy, which proved an increase of ionic conductivity with increasing porosity and increasing Na-β-alumina phase content in the bulk material. Ion conductivity of up to 0.10 S∙cm−1 at 300 °C is achieved.

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“…Ultrafiltration (³10 nm < d < ³100 nm, d: pore diameter) and nanofiltration (³1 nm < d < ³10 nm), which are utilized for the separation of polymers and proteins, are indispensable techniques in recent industries. 6)10) We have made a variety of ceramic membranes composed of pseudobrookite-type Al 2 TiO 5 11) and MgTi 2 O 5 , 12)14) ¢-Al 2 O 3 , 15) Al 2 O 3 /3Y-ZrO 2 composite, 16) and MgAl 2 O 4 spinel. 17)20) Recently, we have reported on the separation/ condensation of a water-soluble polymer, polyethylene oxide (PEO) with molecular weight of ³110,000, using MgAl 2 O 4 spinel membrane filter.…”

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confidence: 99%

Ultrafiltration for bovine serum albumin protein by all alumina porous membranes

Tanuma

Suzuki

2023

J. Ceram. Soc. Japan

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In this study, three types of Al 2 O 3 powders were used as raw materials to fabricate and evaluate the performance of all-alumina multi-layer filters, and an attempt was made to fabricate an ultrafiltration filter that separates and removes proteins. When bovine serum albumin (BSA, molecular weight 66,000) was used as the protein, a very high rejection rate of 91.9 % was obtained even under mild conditions with a differential pressure of 1 atm or less.

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Reactive sintering and particle morphology control of β″-alumina-based water purification filters

Cited by 10 publications

References 36 publications

Overcoming the Trade-off between Water Permeation and Mechanical Strength of Ceramic Membrane Supports by Interfacial Engineering

Overcoming the Trade-off between Water Permeation and Mechanical Strength of Ceramic Membrane Supports by Interfacial Engineering

Sodium Solid Electrolytes: NaxAlOy Bilayer-System Based on Macroporous Bulk Material and Dense Thin-Film

Ultrafiltration for bovine serum albumin protein by all alumina porous membranes

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