TY - JOUR

T1 - Highly Efficient Pervaporation Dehydration of Isopropanol Using Gd-BTC Modified Sodium Alginate Mixed Matrix Membranes

AU - Dubovenko, Roman

AU - Dmitrenko, Mariia

AU - Kuzminova, Anna

AU - Muratidi, Maria

AU - Mikulan, Anna

AU - Kalmakhelidze, Meri

AU - Mukhanova, Elizaveta

AU - Penkova, Anastasia

N1 - Export Date: 16 March 2026; Cited By: 0; Correspondence Address: R. Dubovenko; St. Petersburg State University, St. Petersburg, 7/9 Universitetskaya nab., 199034, Russian Federation; email: r.dubovenko@spbu.ru; M. Dmitrenko; St. Petersburg State University, St. Petersburg, 7/9 Universitetskaya nab., 199034, Russian Federation; email: m.dmitrienko@spbu.ru; A. Penkova; St. Petersburg State University, St. Petersburg, 7/9 Universitetskaya nab., 199034, Russian Federation; email: a.penkova@spbu.ru

PY - 2026/2/12

Y1 - 2026/2/12

N2 - This study presents, for the first time, a comprehensive investigation of gadolinium-based metal–organic framework (Gd-BTC) as a filler in sodium alginate (SA) membranes for pervaporation dehydration of isopropanol (IPA). A series of dense and supported mixed matrix membranes were fabricated and characterized. The optimal dense SA/Gd-BTC(20 wt %) membrane demonstrated an up to 2.3-fold increase in permeation flux over the pristine SA membrane for separation of water–IPA mixtures, while maintaining high selectivity (>99.5% water in the permeate). Subsequent cross-linking with CaCl2 further improved the selectivity and operational stability of this membrane. Furthermore, a cross-linked supported membrane from SA/Gd-BTC(20 wt %) on porous polyacrylonitrile substrate was engineered, achieving an exceptionally high permeation flux of up to 2 kg m–2 h–1. The enhanced performance is attributed to improved membrane hydrophilicity, favorable polymer–filler interactions leading to morphological changes, and polymer reorganization during cross-linking, as confirmed by FTIR, XRD, SEM, AFM, DFT calculations, and other techniques. A comparison of the transport properties of the developed membranes with those reported in the literature highlights Gd-BTC as a highly promising filler for overcoming the permeability–selectivity trade-off, providing an effective strategy for energy-efficient industrial alcohol dehydration. © 2026 American Chemical Society

AB - This study presents, for the first time, a comprehensive investigation of gadolinium-based metal–organic framework (Gd-BTC) as a filler in sodium alginate (SA) membranes for pervaporation dehydration of isopropanol (IPA). A series of dense and supported mixed matrix membranes were fabricated and characterized. The optimal dense SA/Gd-BTC(20 wt %) membrane demonstrated an up to 2.3-fold increase in permeation flux over the pristine SA membrane for separation of water–IPA mixtures, while maintaining high selectivity (>99.5% water in the permeate). Subsequent cross-linking with CaCl2 further improved the selectivity and operational stability of this membrane. Furthermore, a cross-linked supported membrane from SA/Gd-BTC(20 wt %) on porous polyacrylonitrile substrate was engineered, achieving an exceptionally high permeation flux of up to 2 kg m–2 h–1. The enhanced performance is attributed to improved membrane hydrophilicity, favorable polymer–filler interactions leading to morphological changes, and polymer reorganization during cross-linking, as confirmed by FTIR, XRD, SEM, AFM, DFT calculations, and other techniques. A comparison of the transport properties of the developed membranes with those reported in the literature highlights Gd-BTC as a highly promising filler for overcoming the permeability–selectivity trade-off, providing an effective strategy for energy-efficient industrial alcohol dehydration. © 2026 American Chemical Society

KW - Gd-BTC

KW - isopropanol dehydration

KW - metal−organic framework

KW - pervaporation

KW - sodium alginate

KW - Crosslinking

KW - Dehydration

KW - Evaporation

KW - Filler metals

KW - Fillers

KW - Gadolinium compounds

KW - Hydrophilicity

KW - Membranes

KW - Permeation

KW - Sodium

KW - Cross linking

KW - Gadolinia

KW - Isopropanol

KW - Isopropanol dehydration

KW - Metalorganic frameworks (MOFs)

KW - Mixed-matrix membranes

KW - Permeation fluxes

KW - Pervaporation dehydration

KW - Sodium alginate membrane

KW - Economic and social effects

KW - Pervaporation

KW - Sodium alginate

UR - https://www.mendeley.com/catalogue/9a68adfc-38a6-39df-8273-884f017f2271/

U2 - 10.1021/acsapm.5c04885

DO - 10.1021/acsapm.5c04885

M3 - Article

VL - 8

SP - 3235

EP - 3249

JO - ACS Applied Polymer Materials

JF - ACS Applied Polymer Materials

SN - 2637-6105

IS - 4

ER -