Al-DTPA microfiber assisted formwork construction technology for high-performance SiC membrane preparation

Qiao, Hao; Feng, Shasha; Low, Ze Xian; Chen, Jiarui; Zhang, Feng; Zhong, Zhaoxiang; Xing, Weihong

doi:10.1016/j.memsci.2019.117464

Cited by 23 publications

(12 citation statements)

References 29 publications

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“…The majority of the low melting point sintering additives promote densification process through liquid phase by modifying grain boundaries and surface energies. In the literature, SiC ceramics were prepared using various metal oxides sintering additives such as Al 2 O 3 [ 15 , 23 ], Y 2 O 3 [ 24 , 25 , 26 ], ZrO 2 [ 27 , 28 ], CaO [ 27 , 29 ], and MgO [ 30 ] at temperatures ranging from 2000 to 1300 °C. Moreover, some studies showed that the sintering temperature of the SiC ceramics can be further decreased.…”

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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“…7 However, restricted by the traditional membrane fabrication methods such as brush coating, spray coating, spin coating, screen printing, foaming coating, dip coating, etc., slurry may infiltrate and plug the pores of the support under the effect of capillary forces, finally leading to an undesired transition layer embedded in the support, which may increase the filtration resistance of the membrane. 6 Introducing a temporary transition layer is the most effective way to avert penetration of slurry/particles into the support. For example, Wei et al 7 used SiC whiskers as the transition layer to prevent membrane suspension (SiC particles) from being infiltrated in the large-pore (15 μm) SiC support.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The resulted SiC membrane retained 25.5% of gas permeance compared to the SiC support. Qiao et al 6 adopted aluminum-diethylenetriamine pentaacetic acid (Al-DTPA) microfibers as the sacrificial layer to fabricate SiC membrane on the SiC support. The membrane gas permeation showed about 60% reduction compared to the original SiC support.…”

Section: ■ Introductionmentioning

confidence: 99%

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Steric Configuration-Controllable Carbon Nanotubes-Integrated SiC Membrane for Ultrafine Particles Filtration

Yuan

Feng

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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Airborne fine particles have severe effects on abating the duration and efficiency of filters due to their high penetration probability. One-dimensional (1D) nanomaterials-constructed filters show great promise in efficient removal of fine particles. In this work, in situ growth of 1D nanostructure membrane without introducing a transition or sacrificial layer on large-pore SiC support was creatively developed. The controllable growth of carbon nanotubes (CNTs) via chemical vapor deposition (CVD) can bridge a loose structure on the neighbored SiC particles. This CNTs-constructed hierarchical structure can significantly ameliorate the large pores of the SiC support (SiC pore size ∼32.9 μm, CNTs/SiC membrane pore size ∼15 μm). By adjusting the CVD parameters, different configurations of CNT membranes were controllably prepared, in which the special structure of the CNT membrane (S-CNTs/SiC) showed a comparatively higher gas permeance of ∼450 m3/(m2·h·kPa) and fine particle removal efficiency (99.48%). In addition, the S-CNTs/SiC membrane also showed a good long-term filtration performance for fine particles. This work provides a new insight into the preparation of a 1D nanostructure membrane on large-pore ceramic supports high-efficient removal of fine particles.

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“…Recently, SiC-based porous supports with high gas permeability were developed [19][20][21][22][23][24]. In these porous supports with large pore size, it is difficult to suppress both the decreasing of permeability and the formation of membrane defects due to the penetration of sol-gel solution into large pores.…”

Section: Introductionmentioning

confidence: 99%

Gas Permeation Property of Silicon Carbide Membranes Synthesized by Counter-Diffusion Chemical Vapor Deposition

2020

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An amorphous silicon carbide (SiC) membrane was synthesized by counter-diffusion chemical vapor deposition (CDCVD) using silacyclobutane (SCB) at 788 K. The SiC membrane on a Ni-γ-alumina (Al2O3) α-coated Al2O3 porous support possessed a H2 permeance of 1.2 × 10−7 mol·m−2·s−1·Pa−1 and an excellent H2/CO2 selectivity of 2600 at 673 K. The intermittent action of H2 reaction gas supply and vacuum inside porous support was very effective to supply source gas inside mesoporous intermediate layer. A SiC active layer was formed inside the Ni-γ-Al2O3 intermediate layer. The thermal expansion coefficient mismatch between the SiC active layer and Ni-γ-Al2O3-coated α-Al2O3 porous support was eased by the low decomposition temperature of the SiC source and the membrane structure.

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Al-DTPA microfiber assisted formwork construction technology for high-performance SiC membrane preparation

Cited by 23 publications

References 29 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

Steric Configuration-Controllable Carbon Nanotubes-Integrated SiC Membrane for Ultrafine Particles Filtration

Gas Permeation Property of Silicon Carbide Membranes Synthesized by Counter-Diffusion Chemical Vapor Deposition

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