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Transmission of sodium chloride in PDMS membrane during Pervaporation based on polymer relaxation

Zuo, Chengye; Xu, Shuainan; Ding, Xiaobin; Jin, Wanqin; Xing, Weihong; Ke, Xuebin


Chengye Zuo

Shuainan Xu

Xiaobin Ding

Wanqin Jin

Weihong Xing


Polydimethylsiloxane (PDMS) composite membrane is used for treating pharmaceutical wastewater containing NaCl and solvent. In this study, the influence of feed concentrations of NaCl and isobutanol, process temperature and membrane microstructures on salt rejection are evaluated. Microstructures of PDMS membrane before and after separation are characterized by nuclear magnetic resonance (NMR), energy dispersive X-ray spectroscopy (EDS), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Positron annihilation life-time spectroscopy (PALS). The PV results show that NaCl will not spontaneously enter PDMS membrane without isobutanol. However, while NaCl feed concentration is 13 wt%, salt rejection of PDMS membrane drops from 100% to 99.09% with increasing feed concentration of isobutanol (up to 7 wt%). On the contrary, a higher temperature increases salt rejection of PDMS membrane and NaCl permeation through PDMS membrane is not through a vapor permeate process. Due to the relaxation of PDMS polymer chain, when PDMS cross-linking ratio is 0.1, the salt rejection increases from 99.87% to 100% with its thickness increasing from 10 μm to 17.5 μm. While the cross-linking ratio rises to 0.2, the salt rejection is 100% with the PDMS layer thickness of 10 μm. The relationship between relaxation of polymer chains and transport of NaCl in PDMS membrane is an excellent guidance and will be beneficial for the treatment of saline organic wastewater.


Zuo, C., Xu, S., Ding, X., Jin, W., Xing, W., & Ke, X. (2022). Transmission of sodium chloride in PDMS membrane during Pervaporation based on polymer relaxation. Journal of membrane science, 659, Article 120812.

Journal Article Type Article
Acceptance Date Jul 8, 2022
Online Publication Date Jul 16, 2022
Publication Date Oct 5, 2022
Deposit Date Aug 30, 2022
Publicly Available Date Oct 27, 2022
Journal Journal of Membrane Science
Print ISSN 0376-7388
Electronic ISSN 1873-3123
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 659
Article Number 120812
Keywords Salt rejection; Isobutanol; Polydimethylsiloxane membrane; Pervaporation; Polymer relaxation
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