膜科学与技术

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Superhydrophobic modification of the surface of porous SiC ceramics and its performance towards oil-solid separation

Authors： SU Hang, XIE Zixuan, QI Hong

Units： Membrane Science and Technology Research Center, Nanjing Tech University, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 210009, China

KeyWords： porous ceramics; SiC; superhydrophobicity; ZnO; oil-solid separation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(2):8-15

Abstract：

In this paper, using zinc acetate dihydrate and ammonia as raw materials, ZnO nanoflower (NF) structure was fabricated on the surface of porous SiC ceramics with an average pore size of 250 nm by chemical bath deposition, and then grafted with n-octyltriethoxysilane. Effects of Zn2+ concentration, reaction temperature and reaction time on the morphology and superhydrophobic properties of porous SiC ceramic surface were investigated. The wettability and oil-solid separation performance of the blank sample and superhydrophobic porous SiC ceramics were investigated, respectively. Results showed that the optimal conditions for ZnO NFs deposited on porous SiC ceramic surface were as follows: Zn2+ concentration of 75 mmol/L, reaction temperature of 96 ℃, reaction time of 3 h. In this case, the surface of porous ceramics grafted with silane provided with the best superhydrophobic properties. The surface water contact angle (WCA) and rolling contact angle were 173°±2.5°and 2.5°±1°, respectively. In the experiment of oil-solid separation, superhydrophobic porous SiC ceramics exhibited excellent retention towards solid carbon. The steady-state flux was 498.3 L/（m2·h）(measured at a transmembrane pressure of 0.25 MPa), which was 53.6 % higher in comparision with the blank sample.

Funds：

国家自然科学基金项目(21490581)；中国石油化工股份有限公司资助项目(317008-6)

AuthorIntro：

苏航（1996-），男，江苏南京人，硕士生，主要从事疏水陶瓷膜的制备及其在油水分离中的应用，E-mail:931170477@qq.com

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