Tailoring asymmetric Al2O3 membranes by combining tape casting and phase inversion

Coelho, Leticya Lais; Luccio, Marco Di; Hotza, Dachamir; Moreira, Regina de Fátima Peralta Muniz; Moreira, Anderson Camargo; Fernandes, Celso Peres; Rezwan, Kurosch; Wilhelm, Michaela

doi:10.1016/j.memsci.2021.119056

Cited by 20 publications

(6 citation statements)

References 38 publications

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“…On the contrary, good chemical, thermal, and mechanical stability, long working lifespan, and low fouling tendencies of ceramic membranes make them ideal for several water and wastewater treatment applications, which cannot be operated efficiently by the polymeric membranes [ 3 , 4 , 5 ]. In this context, silicon carbide (SiC) membranes have gained special attention as an attractive porous material among the other ceramic membranes such as alumina [ 6 ], titania [ 7 ], and zirconia [ 8 ]. The main advantages of SiC membranes are directly related with to their outstanding chemical, thermal, and mechanical properties under harsh conditions and high flux.…”

Section: Introductionmentioning

confidence: 99%

Ceramic Processing of Silicon Carbide Membranes with the Aid of Aluminum Nitrate Nonahydrate: Preparation, Characterization, and Performance

2021

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The development of a low-cost and environmentally-friendly procedure for the fabrication of silicon carbide (SiC) membranes while achieving good membrane performance is an important goal, but still a big challenge. To address this challenge, herein, a colloidal coating suspension of sub-micron SiC powders was prepared in aqueous media by employing aluminum nitrate nonahydrate as a sintering additive and was used for the deposition of a novel SiC membrane layer onto a SiC tubular support by dip-coating. The sintering temperature influence on the structural morphology was studied. Adding aluminum nitrate nonahydrate reduced the sintering temperature of the as-prepared membrane compared to conventional SiC membrane synthesis. Surface morphology, pore size distribution, crystalline structure, and chemical and mechanical stability of the membrane were characterized. The membrane showed excellent corrosion resistance in acidic and basic medium for 30 days with no significant changes in membrane properties. The pure water permeance of the membrane was measured as 2252 L h−1 m−2 bar−1. Lastly, the final membrane with 0.35 µm mean pore size showed high removal of oil droplets (99.7%) in emulsified oil-in-water with outstanding permeability. Hence, the new SiC membrane is promising for several industrial applications in the field of wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Ceramic Processing of Silicon Carbide Membranes with the Aid of Aluminum Nitrate Nonahydrate: Preparation, Characterization, and Performance

2021

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“…Such porous ceramics by PT have an oriented and gradient pore structure, which could be mainly divided into two parts: the very thin skin layer with small pores and the much thicker finger-like voids layer with large straight pores. 28 In this present study, we report the successful preparation of a series of porous cheap metal (including Ni, Cu and stainless steel) plates by the PT method as membrane electrodes for HER in alkaline water electrolysis. The gradient holes and nitriding treatment of the membrane could contribute to the improvements of both the effective area and active sites of the HER electrode.…”

Section: ■ Introductionmentioning

confidence: 90%

Boosting the Alkaline Hydrogen Evolution Reaction at High Current Density by Porous Cheap Metal Membrane Electrodes

Pi,

Wang,

Yang

et al. 2023

Ind. Eng. Chem. Res.

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Developing an economical, efficient, and durable electrode with a customized size that performs well at high current density is highly demanded to satisfy large-scale hydrogen production via electrochemical water splitting. Accordingly, porous cheap metal (for example, Ni, Cu and stainless steel) membrane electrodes have been fabricated by a facile phase inversion tape casting (PT) and atmosphere heat-treatment (reducing in 5%H2–Ar or NH3) technique to electrocatalyze the hydrogen evolution reaction (HER) in alkaline media. The optimal Ni(R)-PT-N membrane electrode requires a low HER overpotential of only 286 mV to reach a high current density of 200 mA cm–2, outperforming commercial Ni foam. The excellent HER activity of a metallic Ni-based membrane electrode could be attributed to its unique large straight finger-like open pores and abundant active sites derived from the introduction of nanocrystalline Ni or a nitriding process, thus boosting the mass transport as well as the charge transfer kinetics during the alkaline HER process. This work represents an important step in the development of cheap-metal-based membrane electrodes to promote the energy-related reactions such as HER.

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“…73,76 Durante esse processo ocorre um mecanismo termodinâmico complexo de desmistura líquido-líquido. 77 Nesse processo de inversão de fase, chamado de via úmida, o solvente é transferido da solução casting para o banho utilizado, no entanto, de forma contrária, o não solvente é transferido a partir do banho para a solução casting, por conta do gradiente de concentração existente entre as duas fases. 78 Finalmente, após esse processo ocorre a formação da estrutura porosa na membrana polimérica preparada, sobretudo após os processos de precipitação e secagem do polímero 79 (Figura 7.15b).…”

Section: Processo De Inversão De Faseunclassified

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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Tailoring asymmetric Al2O3 membranes by combining tape casting and phase inversion

Cited by 20 publications

References 38 publications

Ceramic Processing of Silicon Carbide Membranes with the Aid of Aluminum Nitrate Nonahydrate: Preparation, Characterization, and Performance

Ceramic Processing of Silicon Carbide Membranes with the Aid of Aluminum Nitrate Nonahydrate: Preparation, Characterization, and Performance

Boosting the Alkaline Hydrogen Evolution Reaction at High Current Density by Porous Cheap Metal Membrane Electrodes

Membranas Poliméricas

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