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Ceramic membranes with different pore sizes modified by silane and their oil-water separation performance

Authors： GOU Limin, Duan Lijun, KE Wei, CHEN Xianfu, QIU Minghui, FAN Yiqun

Units： 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China 2. Nanjing Membrane Material Industry Technology Institute Co., Ltd, Nanjing 211800, China

KeyWords： ceramic membrane; hydrophobic surface; silane graft; oil-water separation

ClassificationCode：TQ028.4

year,volume(issue):pagination： 2024,44(1):16-26

Abstract：

Hydrophobic ceramic membranes with low surface energy are often used for containing-water oil separation, and the improvement of flux is the key to improve the economy of membrane separation process. In this study, hydrophobic ceramic membranes were prepared through organosilane modification. The impact of silane modification on the structure and oil-water separation performance of ceramic membranes with various pore sizes of 1000 nm, 100 nm, and 10 nm was investigated. We examined the changes in membrane surface micromorphology, wettability, and permeability resistance before and after modification for each pore size category. Additionally, we evaluated the stability of modified membranes in organic solvents, acid, and alkali. Subsequently, we assessed membrane performance in separating water-in-oil emulsions with varying water contents. The results show that the silane modification significantly increased the membrane permeability resistance for smaller pore sizes. Employing a low transmembrane pressure operation mode combined with high crossflow contributed to enhanced flux for modified membranes. Regarding W/O emulsion, when water content was 1000 mg/L, all three modified membranes achieved a water rejection exceeding 93%, while maintaining a permeate side water content below 70 mg/L. Among them, the 1μm modified membrane exhibited the highest flux at 375 L·m-2·h-1. However, when the volume fraction of water reached 10vol%, severe contamination occurred on the surface of the 1000 nm modified membrane resulting in significant drop in flux to only 14.1 L·m-2·h-1. Conversely, the 100 nm modified membrane showed less contamination and higher flux.

Funds：

国家重点研发计划项目（2022YFC2105101）；国家自然科学基金（21921006,22078147）；天津市合成生物技术创新能力提升项目（TSBICIP-KJGG-002）；江苏省教育厅青蓝计划

AuthorIntro：

苟立民（1999-），男，四川省巴中市人，硕士研究生，研究方向为陶瓷膜材料及应用，E-mail：goulimin2020025293@163.com

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