Preparation of alumina based tubular asymmetric membranes incorporated with coal fly ash by centrifugal casting

Rocha, Melissa Rodrigues de la; Virginie, Mirella; Khodakov, Andreï Y.; Pollo, Liliane Damaris; Marcílio, Nilson Romeu; Tessaro, Isabel Cristina

doi:10.1016/j.ceramint.2020.09.296

Cited by 25 publications

(4 citation statements)

References 22 publications

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“… Porosity (∼34.36–39.0 %), pore size (∼0.65–1.81 μm) flexural strength (∼10–30 mpa) [ 83 ] SiC-Coal fly ash ceramic membranes dry pressing method Polyvinyl alcohol Graphite- pore former Porosity 54.46 % exhibited good, mechanical properties [ 79 ] Coal fly ash ceramic membrane extrusion method Dolomite used as a pore-forming Carboxymethyl cellulose (cmc) used as a binder Glycerin used as a plasticizer , Large particles reduced mechanical strength of fly ash based membranes while increasing porosity. [ 104 ] Lumina based tubular asymmetric membranes incorporated with coal fly ash Centrifugalcasting technique – Increased porosity and enhanced water permeability coincide with reduced mechanical strength and diminished linear shrinkage [ 105 ] High-aluminum coal fly ash ceramic membrane supports Uniaxial cold-pressing PVA solution as organic binder CaCO 3 pore forming agent Mechanical strengths 34–90 MPa [ 86 ] Coal fly ash-based tubular ceramic membrane Extrusion Dextrin as pore-forming agent CMC, as organic binder Glycerin, to improve the plasticity Porosity 38.9−45.9 % Mechanical strength 14.8−36.0 MPa [ 84 ] Fly ash cenosphere ceramic membrane uniaxial pressing organic binder PVA- CaCO 3 - pore forming agent Porosity 59.25 % Mechanical strength 70 ± 2.58 MPa [ 81 ] Tubular supported ceramic microfiltration membranes from fly ash Slip- casting Dispersant lomar-d Binder dsx 3290 ...…”

Section: Synthesis Of Coal Fly Ash Based Ceramic Membranesmentioning

confidence: 99%

Application of coal fly ash based ceramic membranes in wastewater treatment: A sustainable alternative to commercial materials

Sawunyama,

Olatunde,

Oyewo

et al. 2024

Heliyon

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Section: Synthesis Of Coal Fly Ash Based Ceramic Membranesmentioning

confidence: 99%

Application of coal fly ash based ceramic membranes in wastewater treatment: A sustainable alternative to commercial materials

Sawunyama,

Olatunde,

Oyewo

et al. 2024

Heliyon

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“…A preparação de membranas poliméricas também pode ser realizada por outros métodos além dos citados até agora no texto, sobretudo pelo método da extrusão, alongamento, gravação em trilha, sinterização, lixiviação por molde (template), revestimento por imersão, processo sol-gel, eletrofiação, impressão/moldagem suave, impressão 3D e outros. 66,81,82…”

Section: Outros Processosunclassified

Membranas Poliméricas

Costa¹,

Vermeersch²,

Paranhos³

et al. 2022

Nanotecnologia Aplicada a Polímeros

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Os processos de separação são absolutamente indispensáveis no contexto econômico, ambiental e social. No contexto econômico, por exemplo, inúmeros processos industriais se baseiam em reações químicas, que convertem matérias-primas em produtos valorados. Durante o processo em si, diversos subprocessos permitem a purificação, seleção, reciclagem e rejeição. Em todas essas etapas, os processos de separação se fazem presente. Do ponto de vista ambiental, os processos de separação contribuem enormemente para a remediação ambiental, principalmente no tratamento de água, esgoto e efluentes e na mitigação da poluição atmosférica e do solo. Mais recentemente, os processos de separação também são empregados na área da saúde, em dispositivos para hemodiálise, oxigenação extracorpórea, na esterilização de insumos farmacêuticos e em dispositivos para liberação controlada de fármacos. 1,2 A partir da década de 1950, os processos de separação utilizando membranas, ou processos de separação por membrana (PSM) ganharam atenção. O surgimento de novos polímeros, com propriedades físico-químicas superiores, contribuiu para a ob-

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“…The thin top layer is responsible for separating components; the porous ceramic support provides the necessary mechanical strength to the membrane top layer to withstand the stress induced by the pressure difference applied over the entire membrane, offering, at the same time, a low resistance to the filtrate flow. The most common supports fabrication processes used for membrane systems include extrusion [36,37], tape casting [38], dry pressing, slip casting [39], and centrifugal casting [40][41][42][43]. Amongst them, slip casting, centrifugal casting, and dry pressing methods are widely used in laboratories, while the preferred method in industry is extrusion.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Zircon Microfiltration Membrane for Culture Medium Sterilization

et al. 2023

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Multilayer ceramic membranes to be used for bacteria removal by filtration were prepared from ceramic materials. They consist of a macro-porous carrier, an intermediate layer and a thin separation layer at the top. Tubular and flat disc supports were prepared from silica sand and calcite (natural raw materials), using extrusion and uniaxial pressing methods, respectively. Making use of the slip casting technique, the silica sand intermediate layer and the zircon top-layer were deposited on the supports, in this order. The particle size and the sintering temperature for each layer were optimized to achieve a suitable pore size for the deposition of the next layer. Morphology, microstructures, pore characteristics, strength and permeability were also studied. Filtration tests were conducted to optimize the permeation performance of the membrane. Experimental results show that the total porosity and average pore size of the porous ceramic supports sintered at different temperatures within the range (1150–1300 °C), and lie in the ranges of 44–52% and 5–30 μm, respectively. For the ZrSiO4 top-layer, after firing at 1190 °C, a typical average pore size of about 0.3 μm and a thickness of about 70 μm were measured, while water permeability is estimated to a value of 440 lh−1m−2bar−1. Finally, the optimized membranes were tested in the sterilization of a culture medium. Filtration results show the efficiency of the zircon-deposited membranes for bacteria removal; indeed, the growth medium was found to be free of all microorganisms.

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Preparation of alumina based tubular asymmetric membranes incorporated with coal fly ash by centrifugal casting

Cited by 25 publications

References 22 publications

Application of coal fly ash based ceramic membranes in wastewater treatment: A sustainable alternative to commercial materials

Application of coal fly ash based ceramic membranes in wastewater treatment: A sustainable alternative to commercial materials

Membranas Poliméricas

Fabrication of a Zircon Microfiltration Membrane for Culture Medium Sterilization

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