SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 59 ›› Issue (7): 176-181.DOI: 10.1016/j.cjche.2022.12.006

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Effects of ion-exchange on the pervaporation performance and microstructure of NaY zeolite membrane

Meihua Zhu, Xingguo An, Tian Gui, Ting Wu, Yuqin Li, Xiangshu Chen   

  1. State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
  • Received:2022-09-24 Revised:2022-12-05 Online:2023-10-14 Published:2023-07-28
  • Contact: Meihua Zhu,E-mail:zhumeihua@jxnu.edu.cn;Xiangshu Chen,E-mail:cxs66cn@jxnu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21868012 and 21868013), Jiangxi Provincial Department of Science and Technology (20171BCB24005 and 20181ACH80003).

Effects of ion-exchange on the pervaporation performance and microstructure of NaY zeolite membrane

Meihua Zhu, Xingguo An, Tian Gui, Ting Wu, Yuqin Li, Xiangshu Chen   

  1. State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
  • 通讯作者: Meihua Zhu,E-mail:zhumeihua@jxnu.edu.cn;Xiangshu Chen,E-mail:cxs66cn@jxnu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (21868012 and 21868013), Jiangxi Provincial Department of Science and Technology (20171BCB24005 and 20181ACH80003).

Abstract: Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt. Different nitrate salts, including Co(NO3)2, Mg(NO3)2, Zn(NO3)2, Ca(NO3)2, Cu(NO3)2, KNO3, and AgNO3, have great effects on the channel structure and water affinity of the NaY zeolite membrane. When the concentration of nitrate salt, ion-exchange temperature and time are 0.1 mol·L-1, 50 ℃ and 2 h, the ion-exchange degree order of NaY zeolites is Ag+ > K+ > Ca2+> Zn2+ ≫ Co2+ > Mg2+. Especially, Ag+ and K+ cation exchange degree of NaY zeolites are achieved to 96.54% and 82.77% in this work. BET surface, total pore capacity, pore size distribution and water contact angle of the ion-exchanged NaY zeolites are all disordered by mono- and di-valent cations. Di-valent nitrate salt is favor for increasing the dehydration performance of NaY zeolite membranes by ion-exchange. When the ion-exchange solution is Zn(NO3)2, the total flux variation and separation factor variation of the NaY membrane (M-5) are -45% and 230% for separation of 10% (mass) H2O/EtOH mixture by pervaporation, and the ion-exchanged membranes showed good reproducibility.

Key words: NaY zeolite membrane, Ion-exchange, Pervaporation

摘要: Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt. Different nitrate salts, including Co(NO3)2, Mg(NO3)2, Zn(NO3)2, Ca(NO3)2, Cu(NO3)2, KNO3, and AgNO3, have great effects on the channel structure and water affinity of the NaY zeolite membrane. When the concentration of nitrate salt, ion-exchange temperature and time are 0.1 mol·L-1, 50 ℃ and 2 h, the ion-exchange degree order of NaY zeolites is Ag+ > K+ > Ca2+> Zn2+ ≫ Co2+ > Mg2+. Especially, Ag+ and K+ cation exchange degree of NaY zeolites are achieved to 96.54% and 82.77% in this work. BET surface, total pore capacity, pore size distribution and water contact angle of the ion-exchanged NaY zeolites are all disordered by mono- and di-valent cations. Di-valent nitrate salt is favor for increasing the dehydration performance of NaY zeolite membranes by ion-exchange. When the ion-exchange solution is Zn(NO3)2, the total flux variation and separation factor variation of the NaY membrane (M-5) are -45% and 230% for separation of 10% (mass) H2O/EtOH mixture by pervaporation, and the ion-exchanged membranes showed good reproducibility.

关键词: NaY zeolite membrane, Ion-exchange, Pervaporation