SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (1): 31-41.DOI: 10.1016/j.cjche.2014.09.045

• 分离科学与工程 • 上一篇    下一篇

Effect of sol size on nanofiltration performance of a sol-gel derived microporous zirconia membrane

Guizhi Zhu, Qian Jiang, Hong Qi, Nanping Xu   

  1. Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • 收稿日期:2013-03-18 修回日期:2013-12-30 出版日期:2015-01-28 发布日期:2015-01-24
  • 通讯作者: Hong Qi
  • 基金资助:

    Supported by the National Natural Science Foundation of China (20906047, 21276123), the National High Technology Research and Development Program of China (2012AA03A606), State Key Laboratory of Materials-Oriented Chemical Engineering (ZK201002), the Natural Science Research Plan of Jiangsu Universities (11KJB530006), the “Summit of the Six Top Talents” Program of Jiangsu Province, and a Project Funded by the Priority Academic Program development of Jiangsu Higher Education Institutions (PAPD).

Effect of sol size on nanofiltration performance of a sol-gel derived microporous zirconia membrane

Guizhi Zhu, Qian Jiang, Hong Qi, Nanping Xu   

  1. Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • Received:2013-03-18 Revised:2013-12-30 Online:2015-01-28 Published:2015-01-24
  • Contact: Hong Qi
  • Supported by:

    Supported by the National Natural Science Foundation of China (20906047, 21276123), the National High Technology Research and Development Program of China (2012AA03A606), State Key Laboratory of Materials-Oriented Chemical Engineering (ZK201002), the Natural Science Research Plan of Jiangsu Universities (11KJB530006), the “Summit of the Six Top Talents” Program of Jiangsu Province, and a Project Funded by the Priority Academic Program development of Jiangsu Higher Education Institutions (PAPD).

摘要: This paper reports the effect of sol size on nanofiltration performances of sol-gel derived microporous zirconia membranes. Microstructure, pure water flux, molecular weight cut-off (MWCO) and salt retention of zirconia membranes derived fromzirconia solswith different sizeswere characterized. Thermal evolution, phase composition, microstructure and chemical stability of unsupported zirconia membranes (powder) were determined by thermogravimetric and differential thermal analysis, X-ray diffraction, nitrogen adsorption-desorption and static solubility measurements. Results show that nanofiltration performance of zirconia membranes is highly dependent on sol size. The solwith an average size of 3.8 nm, which is smaller than the pore size of the γ-Al2O3 support (pore size: 5-6 nm), forms a discontinuous zirconia separation layer because of excessive penetration of sol into the support. This zirconiamembrane displays a MWCO value towards polyethylene glycol higher than 4000 Da. A smooth and defect-free zirconiamembrane with a MWCO value of 1195 Da (pore size: 1.75nm) and relative high retention rates towards MgCl2 (76%) and CaCl2 (64%) was successfully fabricated by dip-coating the sol with an appropriate size of 8.6 nm. Zirconia sol with an average size of 12 nm exhibits colloidal nature and forms a zirconia membrane with a MWCO value of 2332 Da (pore size: 2.47 nm). This promising microporous zirconia membrane presents sufficiently high chemical stability in a wide pH range of 1-12.

关键词: Microporous ceramic membranes, Zirconia, Nanofiltration, Sol size, Sol-gel

Abstract: This paper reports the effect of sol size on nanofiltration performances of sol-gel derived microporous zirconia membranes. Microstructure, pure water flux, molecular weight cut-off (MWCO) and salt retention of zirconia membranes derived fromzirconia solswith different sizeswere characterized. Thermal evolution, phase composition, microstructure and chemical stability of unsupported zirconia membranes (powder) were determined by thermogravimetric and differential thermal analysis, X-ray diffraction, nitrogen adsorption-desorption and static solubility measurements. Results show that nanofiltration performance of zirconia membranes is highly dependent on sol size. The solwith an average size of 3.8 nm, which is smaller than the pore size of the γ-Al2O3 support (pore size: 5-6 nm), forms a discontinuous zirconia separation layer because of excessive penetration of sol into the support. This zirconiamembrane displays a MWCO value towards polyethylene glycol higher than 4000 Da. A smooth and defect-free zirconiamembrane with a MWCO value of 1195 Da (pore size: 1.75nm) and relative high retention rates towards MgCl2 (76%) and CaCl2 (64%) was successfully fabricated by dip-coating the sol with an appropriate size of 8.6 nm. Zirconia sol with an average size of 12 nm exhibits colloidal nature and forms a zirconia membrane with a MWCO value of 2332 Da (pore size: 2.47 nm). This promising microporous zirconia membrane presents sufficiently high chemical stability in a wide pH range of 1-12.

Key words: Microporous ceramic membranes, Zirconia, Nanofiltration, Sol size, Sol-gel