Low-temperature cross-linking fabrication of sub-nanoporous SiC-based membranes for application to the pervaporation removal of methanol

Wang, Qing; Xu, Nong; Li, Qiao; Dong, Qiang; Nagasawa, Hiroki; Kanezashi, Masakoto; Zhou, Rongfei; Tsuru, Toshinori

doi:10.1016/j.memsci.2022.121008

Cited by 17 publications

(13 citation statements)

References 45 publications

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“…20 nm). SiC membranes with average pore sizes at the level of nanometers exist, but they are fabricated by using costly, pre-ceramic polymer polycarbosilanes (PCS) at a laboratory scale [ 5 ]; other SiC membranes derived from PCS or polytitanocarbosilane (TiPCS) are dense membranes that are suitable for gas separation (GS) [ 6 , 7 , 8 , 9 , 10 ] and pervaporation (PV) [ 11 , 12 ] applications, but are not ideal for water UF applications. Thus, industry-oriented fabrication of SiC membranes with a smaller average pore size that is suitable for UF applications is highly needed.…”

Section: Introductionmentioning

confidence: 99%

SiO2 Modification of Silicon Carbide Membrane via an Interfacial In Situ Sol–Gel Process for Improved Filtration Performance

Shi,

Jian,

Fang

et al. 2023

Membranes

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Silicon carbide (SiC) membrane has emerged as a promising class of inorganic ceramic membranes with many advantageous attributes and has been used for a variety of industrial microfiltration (MF) processes. The state-of-the-art industrial manufacturing of SiC membranes based on the particle sintering method can only achieve an average pore size that ranges from 40 nm to a few micrometers, which is still unsatisfactory for ultrafiltration (UF) applications. Thus, the pore size control of SiC membranes remains a focus of continuing study. Herein, we provide an in situ sol–gel modification strategy to tailor the pore size of SiC membranes by a superficial deposition of SiO2 onto the membrane surface and membrane pore channels. Our in situ sol–gel modification method is simple and effective. Furthermore, the physical characteristics and the filtration performance of the membrane can easily be controlled by the in situ reaction time. With an optimal in situ reaction time of 30 min, the average pore size of the membrane can be reduced from macropores (400 nm) to mesopores (below 20 nm), and the retention ability for 20 nm fluorescent PS microspheres can be improved from 5% to 93%; the resultant SiC/SiO2 composite membranes are imparted with water permeance of 77 L·m−2·h−1·bar−1, improved anti-protein-fouling properties, excellent performance, and anti-acid stabilities. Therefore, modified SiC/SiO2 membranes based on the in situ sol–gel process have great potential as UF membranes for a variety of industrial processes.

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Section: Introductionmentioning

confidence: 99%

SiO2 Modification of Silicon Carbide Membrane via an Interfacial In Situ Sol–Gel Process for Improved Filtration Performance

Shi,

Jian,

Fang

et al. 2023

Membranes

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“…It is very difficult to separate MTBE from the MeOH/MTBE mixtures at azeotropic concentrations (14.3 wt % MeOH and 85.7 wt % MTBE). 4,5 In factories, the common separation method for MeOH/ MTBE mixtures is multiple distillation, 6 and this distillationrecovery-redistillation operation is expensive and highly energy consuming. In recent years, membrane separation technology has attracted a great deal of attention by virtue of its environmental friendliness, low energy consumption, high efficiency, and simple operation and has been widely used in chemical, biological, food, medical, and other research areas.…”

Section: Introductionmentioning

confidence: 99%

“…However, MTBE and MeOH form an azeotropic mixture at atmospheric pressure. It is very difficult to separate MTBE from the MeOH/MTBE mixtures at azeotropic concentrations (14.3 wt % MeOH and 85.7 wt % MTBE). , In factories, the common separation method for MeOH/MTBE mixtures is multiple distillation, and this distillation-recovery-redistillation operation is expensive and highly energy consuming. In recent years, membrane separation technology has attracted a great deal of attention by virtue of its environmental friendliness, low energy consumption, high efficiency, and simple operation and has been widely used in chemical, biological, food, medical, and other research areas. , Pervaporation, one of the representative methods of membrane separation technology, is a promising alternative for the separation of MeOH/MTBE azeotropic mixtures because of its energy efficiency, high accuracy, and ease of construction. − Therefore, the key point for separating MeOH/MTBE mixtures by pervaporation is to find appropriate materials and develop the corresponding preparation strategies to obtain stable, high-quality membranes.…”

Section: Introductionmentioning

confidence: 99%

Induced Synthesis of an Al-Based CAU-10 Tubular Membrane for the Highly Efficient Separation of MeOH/MTBE by Pervaporation

Zhao,

Gao,

Zhu

et al. 2023

Ind. Eng. Chem. Res.

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The preparation of stable metal−organic framework tubular membranes for liquid mixture separation has always been a tough problem. Herein, a flexibly prepared, continuous, and stable Al-based CAU-10 membrane with ceramic tubes as support was developed by a thin γ-Al 2 O 3 layer induction method and employed for the first time in the separation of MeOH/MTBE azeotropic mixtures through pervaporation. The γ-Al 2 O 3 layer introduced on the tube by the dip-coating technique not only facilitated the crystal nucleation and continuous growth of CAU-10 membranes but also reinforced the membrane stability by acting as anchoring sites between the membrane and the substrate. The as-prepared CAU-10 tubular membrane exhibited excellent separation performance for MeOH/MTBE mixtures owing to its suitable pore size and good hydrophilicity. For the separation of 14.3 wt % MeOH/MTBE azeotropic mixtures, the membrane displayed a permeation flux of 1.76 kg/(m 2 h) and a high separation factor of 2041 at 50 °C, which is better than most of the membranes reported for the pervaporation separation of MeOH/MTBE mixtures. More excitedly, the CAU-10 tubular membrane continued to be tested for more than 7 days without any obvious change in pervaporation performance, demonstrating its outstanding operational and hydrothermal stability. Accordingly, the CAU-10 tubular membrane would be a promising alternative to separate the MeOH/MTBE azeotropic mixtures due to its easy preparation, high performance, and excellent stability.

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“…Various membrane materials, such as polymer membranes [5,6], zeolite membranes [3,7,8], metal-organic framework (MOF) membranes [9,10], mixed matrix membranes [11,12], and silicon carbide membranes [13][14][15], have been explored for separation. Among them, zeolites have become promising candidates for high-performance membranes in separation processes, catalytic membranes, and sensors considering their well-defined pore sizes, molecular sieving performance, high thermal stability, and high mechanical strength [16].…”

Section: Introductionmentioning

confidence: 99%

High-Performance FAU Zeolite Membranes Derived from Nano-Seeds for Gas Separation

Wang,

Chen,

et al. 2023

Membranes

Self Cite

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In this study, high-performance FAU (NaY type) zeolite membranes were successfully synthesized using small-sized seeds of 50 nm, and their gas separation performance was systematically evaluated. Employing nano-sized NaY seeds and an ultra-dilute reaction solution with a molar composition of 80 Na2O: 1Al2O3: 19 SiO2: 5000H2O, the effects of synthesis temperature, crystallization time, and porous support (α-Al2O3 or mullite) on the formation of FAU membranes were investigated. The results illustrated that further extending the crystallization time or increasing the synthesis temperature led to the formation of a NaP impurity phase on the FAU membrane layer. The most promising FAU membrane with a thickness of 2.7 µm was synthesized on an α-Al2O3 support at 368 K for 8 h and had good reproducibility. The H2 permeance of the membrane was as high as 5.34 × 10−7 mol/(m2 s Pa), and the H2/C3H8 and H2/i-C4H10 selectivities were 183 and 315, respectively. The C3H6/C3H8 selectivity of the membrane was as high as 46, with a remarkably high C3H6 permeance of 1.35 × 10−7 mol/(m2 s Pa). The excellent separation performance of the membrane is mainly attributed to the thin, defect-free membrane layer and the relatively wide pore size (0.74 nm).

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Low-temperature cross-linking fabrication of sub-nanoporous SiC-based membranes for application to the pervaporation removal of methanol

Cited by 17 publications

References 45 publications

SiO2 Modification of Silicon Carbide Membrane via an Interfacial In Situ Sol–Gel Process for Improved Filtration Performance

SiO2 Modification of Silicon Carbide Membrane via an Interfacial In Situ Sol–Gel Process for Improved Filtration Performance

Induced Synthesis of an Al-Based CAU-10 Tubular Membrane for the Highly Efficient Separation of MeOH/MTBE by Pervaporation

High-Performance FAU Zeolite Membranes Derived from Nano-Seeds for Gas Separation

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