Air-sintered silicon (Si)-bonded silicon carbide (SiC) hollow fiber membranes for oil/water separation

Bessa, Lidiane Pereira; Ferreira, Eduardo de Paulo; Cardoso, Vicelma Luiz; Reis, Miria Hespanhol Miranda

doi:10.1016/j.jeurceramsoc.2021.08.025

Cited by 21 publications

(7 citation statements)

References 41 publications

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“…The water permeation study of the porous SiC membrane in this work is compared with literature data as summarized in Table 4. [28][29][30]32,[49][50][51] The results of this work are comparable to or even better than literature data. However, based on the operating parameters performance of the membrane at best optimum operating conditions need to be evaluated.…”

Section: Permeation Characteristics Of the Membranessupporting

confidence: 86%

“…The pure water‐specific permeability (SP) value of the membrane prepared without pore former MSC2 was found to be 3690 Lm −2 h −1 bar −1 which was increased to 5165 and 6560 Lm −2 h −1 bar −1 respectively with increase of porosity of the membrane by the addition of 10 and 20% graphite powder. The water permeation study of the porous SiC membrane in this work is compared with literature data as summarized in Table 4 28–30,32,49–51 . The results of this work are comparable to or even better than literature data.…”

Section: Resultssupporting

confidence: 58%

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Influence of additive contents on the properties of SiC ceramic membranes and their performance in oil‐water separation

Das

Kayal

2023

Int J Applied Ceramic Tech

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The high processing cost is the key challenge for the economic industrial use of SiC membrane The aim of this research was to fabricate mullite bonded porous SiC ceramic membrane at low temperature from novel combinations of fly ash and alumina (FA) in weight ratio 44.5:55.5 as sintering additives. The influences of FA and pore former content on the porosity, morphology, crystalline phase composition, mechanical performance, permeability properties were investigated. The membrane prepared at 1300 • C using 20 wt% FA showed pure water permeability 3690 Lm −2 h −1 bar −1 and exhibited high oil removal efficiency of ∼ 98% from the synthetic oil-water emulsion having oil concentration of 1000 mg/L. The corrosion behaviour of silicon carbide membrane in the strong acid and alkali solution and its mechanism were investigated. The utilization of fly ash successfully reduced the raw material cost and sintering temperature and the use of alumina reduced the amount of oxidation of SiC as well as increased the amount of mullite bond phase which resulted excellent mechanical strength to the final ceramics.

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Section: Permeation Characteristics Of the Membranessupporting

confidence: 86%

Section: Resultssupporting

confidence: 58%

Influence of additive contents on the properties of SiC ceramic membranes and their performance in oil‐water separation

Das

Kayal

2023

Int J Applied Ceramic Tech

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“…While using Al 2 O 3 as the binder, porous fibrous ceramics possess a relatively high compressive strength (2.78–3.40 MPa) and the highest bulk density (0.69–1.17 g·cm –3 ) simultaneously, whereas the bulk density also significantly increases. Hence, compared to porous fibrous ceramics bonded with different binders, − the synthesized CLPFCs bonded with mullite-SiO 2 possess a unique integration of low bulk density (0.48 g·cm –3 ) and excellent compressive strength (4.54 MPa). Furthermore, high-temperature compressive strength tests of porous fibrous ceramics are still lacking in most of the previously published studies, whereas the high-temperature compressive strength of CLPFCs in this work is investigated and has been enhanced up to 3.45 MPa at 1300 °C as illustrated in Figure .…”

Section: Results and Discussionmentioning

confidence: 99%

“…On the other hand, the lamellas of the CLPFCs actually should be regarded as the binder with a specific structure that has significant influences on the microstructure and mechanical properties of the porous fibrous ceramic. Among diverse binders that have been utilized to fabricate porous fibrous ceramics, SiO 2 is one of the most common high-temperature binders and has been widely applied in porous fibrous ceramics. , The introduction of other binders like B 2 O 3 , and Al 2 O 3 ,, has been confirmed to be beneficial to reinforcing the porous fibrous ceramics. However, the low melting point of SiO 2 and B 2 O 3 tremendously limits their tolerance capacity and service life in the extremely high temperature environment.…”

Section: Introductionmentioning

confidence: 99%

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

Zhang

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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Porous fiber-based ceramics have been widely applied in various fields because of their excellent thermal insulation property and high thermal stability property. However, designing porous fibrous ceramics with enhanced comprehensive performances, such as low density, low thermal conductivity, and high mechanical properties at both room temperature and high temperature, is still a challenge and the future development trend. Hence, based on the lightweight cuttlefish bone that possesses a “wall-septa” structure with excellent mechanical performance, we design and fabricate a novel porous fibrous ceramic with the unique fiber-based dual structure of lamellas by the directional freeze-casting method and systematically investigate the effects of lamellar components on the microstructure and mechanical performances of the product. For the desired cuttlefish-bone-structure-like lamellar porous fiber-based ceramics (CLPFCs), the porous framework formed by the overlapping of transversely arranged fibers helps to reduce the density and thermal conductivity of the product, and the longitudinally arranged lamellar structure replaces traditional binders and plays an important role in improving the mechanical properties in the direction parallel to the X–Z plane. Compared with traditional porous fibrous materials reported in the literature, the CLPFCs with an Al2O3/SiO2 molar ratio of 1:2 in the lamellar component exhibits prominent comprehensive performances, such as low density, excellent thermal insulation property, and outstanding mechanical performances at both room temperature and high temperature (3.46 MPa at 1300 °C), indicating that the CLPFCs are a promising candidate for applications in high-temperature thermal insulation systems.

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“…6(a). The microvoids were formed due to the viscous ngering phenomenon and/or the interfacial instabilities described by the Rayleigh-Taylor theory (Lee et al 2015;Bessa et al 2022). Pure solvent was used as internal bore uid and, therefore, the microvoids were formed from the ber outer surface since the ber nascent was in direct contact with the water coagulation bath.…”

Section: Characteristics Of the Supported Catalystmentioning

confidence: 99%

Well-dispersed titanium dioxide and silver nanoparticles on external and internal surfaces of asymmetric alumina hollow fibers for enhanced chromium (VI) photoreductions

Costa

Ribeiro

Nascimento

et al. 2023

Environ Sci Pollut Res

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Silver (Ag)-decorated titanium dioxide (TiO 2 ) catalysts were produced under ultrasound irradiation at different loadings of Ag nanoparticles (from 5 to 50 wt%). Then, the catalysts were supported on internal and external surfaces of alumina hollow bers with asymmetric pore size distribution. The produced catalysts were considered for Cr(VI) photoreductions. The ultrasound-assisted process potentialized the distribution of Ag nanoparticles on the TiO 2 surface. The loading of Ag nanoparticles at concentrations greater than 5 wt% was necessary to improve the TiO 2 activity for Cr(VI) photoreduction. The loading of Ag nanoparticles at 30 wt% improved the Cr(VI) photoreduction of the single TiO 2 catalyst from 40.49 ± 0.98 to 55.00 ± 0.83% after 180 min of reaction. Suspended and supported Ag-decorated TiO 2 catalysts achieved total Cr(VI) photoreduction after 21 h of reaction. The adjusted reaction rate constant with the externally supported Ag-TiO 2 catalyst was 3.57x10 -3 ± 0.18 x10 -3 min -1 . Similar reaction rate constants were achieved with suspended and internally supported catalysts (approximately 2.70x10 -3 min -1 ). After 10 sequential reuses, all catalysts presented similar Cr(VI) photoreductions of approximately 66%.Nevertheless, the use of the externally supported catalyst is suggested for Cr(VI) photoreductions due to its superior catalyst activity at least in the rst reuse cycles. HighlightsProduction and decoration of Ag nanoparticles on TiO 2 by ultrasound irradiation Cr(VI) photoreduction is favored by the increase in Ag nanoparticle loading Supporting of Ag-decorated TiO2 catalysts on alumina hollow bers Externally supported catalysts presented superior reaction rate for Cr(VI) reduction

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Air-sintered silicon (Si)-bonded silicon carbide (SiC) hollow fiber membranes for oil/water separation

Cited by 21 publications

References 41 publications

Influence of additive contents on the properties of SiC ceramic membranes and their performance in oil‐water separation

Influence of additive contents on the properties of SiC ceramic membranes and their performance in oil‐water separation

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

Well-dispersed titanium dioxide and silver nanoparticles on external and internal surfaces of asymmetric alumina hollow fibers for enhanced chromium (VI) photoreductions

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