Preprint Article Version 4 Preserved in Portico This version is not peer-reviewed

Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

Version 1 : Received: 31 October 2019 / Approved: 1 November 2019 / Online: 1 November 2019 (12:58:52 CET)
Version 2 : Received: 5 November 2019 / Approved: 6 November 2019 / Online: 6 November 2019 (11:59:32 CET)
Version 4 : Received: 7 January 2020 / Approved: 8 January 2020 / Online: 8 January 2020 (09:04:29 CET)

A peer-reviewed article of this Preprint also exists.

Yang, X. Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by In Situ FT-IR Spectroscopy. Membranes 2020, 10, 12. Yang, X. Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by In Situ FT-IR Spectroscopy. Membranes 2020, 10, 12.

Journal reference: Membranes 2020, 10, 12
DOI: 10.3390/membranes10010012

Abstract

The interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC) has been extensively utilized to synthesize nanofiltration (NF) membranes. However, it is still a huge challenge to monitor the IP reaction, because of the fast reaction rate and the formed ultra-thin film. Herein, two effective strategies were applied to reduce the IP reaction rate: (1) the introduction of hydrophilic interlayers between the porous substrate and the formed polyamide layer, and (2) the addition of macromolecular additives in the aqueous solution of PIP. As a result, in situ Fourier transform infrared (FT-IR) spectroscopy was firstly used to monitor the IP reaction of PIP/TMC with hydrophilic interlayers or macromolecular additives in the aqueous solution of PIP. Moreover, the formed polyamide layer growth on the substrate was studied in a real-time manner. The in situ FTIR experimental results confirmed that the IP reaction rates were effectively suppressed and that the formed polyamide thickness was reduced from 138 ± 24 nm to 46 ± 2 nm according to TEM observation. Furthermore, an optimized NF membrane with excellent performance was consequently obtained, which included boosted water permeation of about 141–238 (L/m2·h·MPa) and superior salt rejection of Na2SO4 > 98.4%.

Supplementary and Associated Material

https://www.mdpi.com/2077-0375/10/1/12: Membranes 2020, 10(1), 12; https://doi.org/10.3390/membranes10010012

Subject Areas

interfacial polymerization; in-situ FT-IR spectroscopy; thin-film composite membrane; nanofiltration membrane

Comments (1)

Comment 1
Received: 8 January 2020
Commenter: Xi Yang
Commenter's Conflict of Interests: Author
Comment: A peer-reviewed article of this Preprint also exists. Journal reference: Membranes 2020, 10, 12 DOI: 10.3390/membranes10010012
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