Membranes with Nanodiamonds for Water Treatment

  • Author:
  • Published: 22 December 2020
  • Copyright: Wiley-VCH GmbH
  • Source / Publisher: ACS Applied Materials & Interfaces/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Membranes with Nanodiamonds for Water Treatment

The efficient treatment of wastewater is important to recover clean freshwater, which is a finite resource. Current purification techniques generally cannot efficiently handle the very hot wastewater generated by some industries. For example, some oil recovery methods produce hot wastewater, which requires energy-intensive cooling before it can be purified through traditional reverse-osmosis membranes. After purification, the water then needs to be heated before it can be reused. At high temperatures, traditional reverse-osmosis membranes filter slowly and allow more salts, solids, and other contaminants to get through.

Behnam Khorshidi, Mohtada Sadrzadeh, University of Alberta, Edmonton, Canada, and colleagues have developed nanodiamond-containing thin-film nanocomposite polyamide membranes to solve this problem. The team first functionalized nanodiamonds, which were created by detonations, by oxidizing them to form carboxylic acid groups, followed by a halogenation with thionyl chloride and a reaction with m-phenylene diamine (MPD). Then they prepared thin-film nanocomposite (TFN) polyamide membranes by adding the functionalized nanodiamonds to the monomer solution of the polyamide. Ethyl acetate was used as a cosolvent to facilitate the dispersion of the nanoparticles in the polyamide matrix.

This resulted in thicker, more temperature-stable membranes with improved performance. The nanoparticles improve the structural integrity of the polyamide layer. By increasing the amount of amine-enhanced nanodiamonds in the membrane, the team obtained higher filtration rates with a greater proportion of impurities being removed compared with membranes without nanodiamonds. Overall, the method produces membranes that could more effectively treat wastewater at high temperatures.



Article Views: 1633

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission. more

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH