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Polyamide membrane surface and bulk modification using humid environment as a new heat curing medium

Karimi, H ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1016/j.memsci.2016.09.042
  3. Publisher: Elsevier B.V , 2017
  4. Abstract:
  5. Heat curing was devised in temperature-controlled steam and water environments to synthesize reverse osmosis (RO) polyamide (PA) membrane. The effect of new curing media on the physicochemical properties and RO performance of the synthesized polyamides was fully investigated using X-ray photoelectron spectroscopy (XPS), attenuated total reflection infrared (ATR-IR), scanning electron microscopy (SEM), atomic force microscopy (AFM), and water drop contact angle. The results show a reduction in amide linkage content on the surface of the steam-cured polyamide and surface and bulk of the water-cured polyamide. Additionally, it was revealed that heat curing in the humidity-controlled environment can be considered as a chemical modification process with the ability to change the cross-linking degree in adjustable depth and intensity. Heat curing in steam provided the membrane with great surface hydrophilicity, permeate flux, and salt rejection, which are required for treating dilute solutions. Moreover, the water-cured membrane exhibited extra high surface hydrophilicity and salt rejection that are necessary for treating solutions with high inorganic fouling tendency and high osmotic pressure. © 2016 Elsevier B.V
  6. Keywords:
  7. Chemical modification ; Cross-linking degree ; Heat curing medium ; Polyamide membrane ; Reverse osmosis ; Atomic force microscopy ; Humidity control ; Hydrophilicity ; Membranes ; Osmosis ; Polyamides ; Scanning electron microscopy ; X ray photoelectron spectroscopy ; Attenuated total reflection-infrared ; Controlled environment ; Curing mediums ; Physicochemical property ; Polyamide membranes ; Surface hydrophilicity ; Water environments ; Curing ; Polyamide ; Sodium chloride ; Water ; Article ; Cross linking ; Heat curing ; High temperature procedures ; Humidity ; Membrane ; Membrane permeability ; Physical chemistry ; Priority journal ; Surface property ; Water vapor
  8. Source: Journal of Membrane Science ; Volume 523 , 2017 , Pages 129-137 ; 03767388 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0376738816317343