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

doi:10.1016/j.cjche.2022.12.006

Abstract

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

Meihua Zhu, Xingguo An, Tian Gui, Ting Wu, Yuqin Li, Xiangshu Chen. Effects of ion-exchange on the pervaporation performance and microstructure of NaY zeolite membrane[J]. Chinese Journal of Chemical Engineering, 2023, 59(7): 176-181.

Meihua Zhu, Xingguo An, Tian Gui, Ting Wu, Yuqin Li, Xiangshu Chen. Effects of ion-exchange on the pervaporation performance and microstructure of NaY zeolite membrane[J]. 中国化学工程学报, 2023, 59(7): 176-181.

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