Hydrophilic SiC hollow fiber membranes for low fouling separation of oil-in-water emulsions with high flux

Xu, Man; Xu, Chenxi; Rakesh, K.P.; Cui, Yuge; Yin, Jun; Chen, Changlian; Chen, Bingcai; Zhu, Li

doi:10.1039/c9ra06695k

Cited by 31 publications

(7 citation statements)

References 40 publications

(48 reference statements)

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“…This finding can be explained by the hydrophilicity of the TiO 2 membrane, but also depends on the stability of the oil-in-water suspension. Even though these membranes showed similar oil removal rates, the permeability of the SiC membrane developed in this study was significantly higher than that of other SiC membranes [ 32 , 51 , 52 , 53 ], Al 2 O 3 [ 54 ], ZrO 2 -Al 2 O 3 [ 55 ], and TiO 2 [ 50 ] membranes. The enhanced permeability is beneficial for reducing investment costs and footprint of the membrane installations, two crucial aspects for the application of ceramic membranes in the treatment of oily wastewater, as in the food industry or in the enhanced recovery of oil and gas.…”

Section: Resultsmentioning

confidence: 61%

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: Resultsmentioning

confidence: 61%

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

2021

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“…Improving the hydrophilicity of ceramic membranes is a commonly used approach to reduce fouling caused by organic compounds and microorganisms in the treatment of oily wastewater. 162 One way to enhance the hydrophilicity of the surface is through modification of the ceramic membrane with nanoscale materials such as ferric oxide (Fe 2 O 3 ), GO, TiO 2 , SiO 2 , ZrO 2 , and Al 2 O 3 , which has been shown to improve fouling resistance performance. 163 Moreover, using these materials can lead to increased flux, oil rejection, and reduced fouling.…”

Section: Fouling Mitigation On the Ceramic Membrane Surfacementioning

confidence: 99%

“…This is particularly relevant for anionic surfactant-stabilized oil emulsions, which experience repulsive and attractive forces between the oil droplets and the membrane surface depending on the pH relative to the IEP. A comparative study by Xu et al 162 investigated the performance of Al 2 O 3 and SiC membranes for oil/water separation and fouling build-up on the membrane surface through the MF process. The results showed that the SiC membrane exhibited higher anti-fouling resistance and permeate flux stability due to its higher hydrophilic properties, stronger repulsion, and ability to repel oil droplets through electrostatic repulsion.…”

Section: Fouling Mitigation On the Ceramic Membrane Surfacementioning

confidence: 99%

“…This is particularly relevant for anionic surfactant‐stabilized oil emulsions, which experience repulsive and attractive forces between the oil droplets and the membrane surface depending on the pH relative to the IEP. A comparative study by Xu et al 162 . investigated the performance of Al 2 O 3 and SiC membranes for oil/water separation and fouling build‐up on the membrane surface through the MF process.…”

Section: Strategies To Mitigate the Bottlenecks Of Ceramic Membranesmentioning

confidence: 99%

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Recent progress and technical improvement strategies for mitigating ceramic membrane bottlenecks in water purification processes: A review

Omar

Othman

Tai

et al. 2023

Int J Applied Ceramic Tech

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Ceramic membranes offer considerable promise for future industrial applications due to their superior chemical, mechanical, and thermal stabilities, resistance to harsh operating conditions, and long‐term operating processes. However, several bottlenecks still limit their commercial scale‐up in filtration and separation applications, including brittleness, the high costs of conventional ceramic materials, and fouling. Despite several articles in the literature on ceramic membranes, this review focuses on recent progress, technical strategies, and methods to mitigate these limitations that significantly impact their separation and filtration performance. The use of alternative naturally occurring ceramic materials to mitigate the high costs of conventional ceramic materials is discussed, as well as strategies to improve the mechanical strength of brittle ceramic membranes by increasing sintering temperatures and using support materials. Additionally, advanced techniques to mitigate fouling accumulation and wetting in the pores and on the ceramic membrane surface, such as increasing membrane hydrophilicity and surface modification, are addressed. Despite progress in technical solutions for mitigating the bottlenecks of ceramic membranes, these limitations persist. Therefore, the present limitations and future research directions are highlighted.

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“…SiC and Si 3 N 4 materials also have a very low IEP (close to SiO 2 ) and high chemical stability. Xu et al [141] compared the performance of alumina and SiC hollow fibre membranes for MF of O/W emulsion, the results indicated that the SiC membrane had a smaller pore size, but gave a higher flux due to a higher hydrophilic surface. In addition, a better anti-fouling ability was observed for the SiC membrane owing to electrostatic repulsion to oil.…”

Section: Surface Charged Ceramic Membranementioning

confidence: 99%

State-of-the-Art Ceramic Membranes for Oily Wastewater Treatment: Modification and Application

2021

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Membrane filtration is considered to be one of the most promising methods for oily wastewater treatment. Because of their hydrophilic surface, ceramic membranes show less fouling compared with their polymeric counterparts. Membrane fouling, however, is an inevitable phenomenon in the filtration process, leading to higher energy consumption and a shorter lifetime of the membrane. It is therefore important to improve the fouling resistance of the ceramic membranes in oily wastewater treatment. In this review, we first focus on the various methods used for ceramic membrane modification, aiming for application in oily wastewater. Then, the performance of the modified ceramic membranes is discussed and compared. We found that, besides the traditional sol-gel and dip-coating methods, atomic layer deposition is promising for ceramic membrane modification in terms of the control of layer thickness, and pore size tuning. Enhanced surface hydrophilicity and surface charge are two of the most used strategies to improve the performance of ceramic membranes for oily wastewater treatment. Nano-sized metal oxides such as TiO2, ZrO2 and Fe2O3 and graphene oxide are considered to be the potential candidates for ceramic membrane modification for flux enhancement and fouling alleviation. The passive antifouling ceramic membranes, e.g., photocatalytic and electrified ceramic membranes, have shown some potential in fouling control, oil rejection and flux enhancement, but have their limitations.

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Hydrophilic SiC hollow fiber membranes for low fouling separation of oil-in-water emulsions with high flux

Abstract: The dry-wetting spinning technique involving immersion-induced phase inversion and dry-sintering was applied to prepare two types of SiC and Al2O3 hollow fiber membranes.

Cited by 31 publications

References 40 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

Recent progress and technical improvement strategies for mitigating ceramic membrane bottlenecks in water purification processes: A review

State-of-the-Art Ceramic Membranes for Oily Wastewater Treatment: Modification and Application

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