SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 63 ›› Issue (11): 1-11.DOI: 10.1016/j.cjche.2023.05.010

• Full Length Article •    下一篇

Effects of the original state of sodium-based additives on microstructure, surface characteristics and filtration performance of SiC membranes

Yuling Xie1, Qilin Gu1, Qian Jiang1, Zhaoxiang Zhong1,2, Weihong Xing1   

  1. 1. National Engineering Research Center for Special Separation Membrane, State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2. School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China
  • 收稿日期:2023-02-16 修回日期:2023-04-30 出版日期:2023-11-28 发布日期:2024-01-08
  • 通讯作者: Zhaoxiang Zhong,E-mail:zhongzx@njtech.edu.cn;Weihong Xing,E-mail:xingwh@njtech.edu.cn
  • 基金资助:
    This work was financially supported by the National Key Research and Development Program of China (2022YFB3805002), the National Natural Science Foundation of China (21838005), the Innovative Research Groups of the National Natural Science Foundation of China (21921006), the Natural Science Foundation of Jiangsu Province (BK20220345) and Youth Science and Technology Talents Lifting Project of Jiangsu Association of Science and Technology (105019ZS_007).

Effects of the original state of sodium-based additives on microstructure, surface characteristics and filtration performance of SiC membranes

Yuling Xie1, Qilin Gu1, Qian Jiang1, Zhaoxiang Zhong1,2, Weihong Xing1   

  1. 1. National Engineering Research Center for Special Separation Membrane, State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2. School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China
  • Received:2023-02-16 Revised:2023-04-30 Online:2023-11-28 Published:2024-01-08
  • Contact: Zhaoxiang Zhong,E-mail:zhongzx@njtech.edu.cn;Weihong Xing,E-mail:xingwh@njtech.edu.cn
  • Supported by:
    This work was financially supported by the National Key Research and Development Program of China (2022YFB3805002), the National Natural Science Foundation of China (21838005), the Innovative Research Groups of the National Natural Science Foundation of China (21921006), the Natural Science Foundation of Jiangsu Province (BK20220345) and Youth Science and Technology Talents Lifting Project of Jiangsu Association of Science and Technology (105019ZS_007).

摘要: Sodium-contained compounds are promising sintering additives for the low-temperature preparation of reaction bonded SiC membranes. Although sodium-based sintering additives in various original states were attempted, their effects on microstructure and surface properties have rarely been studied. In this work, three types of sodium-based additives, including solid-state NaA zeolite residue (NaA) and liquid-state dodecylbenzene sulfonate (SDBS) and water glass (WG), were separately adopted to prepare SiC membranes, and the microstructure, surface characteristics and filtration performance of these SiC membranes were comparatively studied. Results showed that the SiC membranes prepared with liquid-state SDBS and WG (S-SDBS and S-WG) showed lower open porosity yet higher bending strength compared to those prepared with solid-state NaA (S-NaA). The observed differences in bending strength were further interpreted by analyzing the reaction process of each sintering additive and the composition of the bonding phase in the reaction bonded SiC membranes. Meanwhile, the microstructural differentiation was correlated to the original state of the additives. In addition, their surface characteristics and filtration performance for oil-in-water emulsion were examined and correlated to the membrane microstructure. The S-NaA samples showed higher hydrophilicity, lower surface roughness (1.80 μm) and higher rejection ratio (99.99%) in O/W emulsion separation than those of S-WG and S-SDBS. This can be attributed to the smaller mean pore size and higher open porosity, resulting from the originally solid-state NaA additives. Therefore, this work revealed the comprehensive effects of original state of sintering additives on the prepared SiC membranes, which could be helpful for the application-oriented fabrication by choosing additives in suitable state.

关键词: SiC membrane, Sintering additive, Reaction sintering, Microstructure, Oil-in-water emulsions

Abstract: Sodium-contained compounds are promising sintering additives for the low-temperature preparation of reaction bonded SiC membranes. Although sodium-based sintering additives in various original states were attempted, their effects on microstructure and surface properties have rarely been studied. In this work, three types of sodium-based additives, including solid-state NaA zeolite residue (NaA) and liquid-state dodecylbenzene sulfonate (SDBS) and water glass (WG), were separately adopted to prepare SiC membranes, and the microstructure, surface characteristics and filtration performance of these SiC membranes were comparatively studied. Results showed that the SiC membranes prepared with liquid-state SDBS and WG (S-SDBS and S-WG) showed lower open porosity yet higher bending strength compared to those prepared with solid-state NaA (S-NaA). The observed differences in bending strength were further interpreted by analyzing the reaction process of each sintering additive and the composition of the bonding phase in the reaction bonded SiC membranes. Meanwhile, the microstructural differentiation was correlated to the original state of the additives. In addition, their surface characteristics and filtration performance for oil-in-water emulsion were examined and correlated to the membrane microstructure. The S-NaA samples showed higher hydrophilicity, lower surface roughness (1.80 μm) and higher rejection ratio (99.99%) in O/W emulsion separation than those of S-WG and S-SDBS. This can be attributed to the smaller mean pore size and higher open porosity, resulting from the originally solid-state NaA additives. Therefore, this work revealed the comprehensive effects of original state of sintering additives on the prepared SiC membranes, which could be helpful for the application-oriented fabrication by choosing additives in suitable state.

Key words: SiC membrane, Sintering additive, Reaction sintering, Microstructure, Oil-in-water emulsions