A novel tannic acid-metal complex coating layer was added on a commercially available cellulose triacetate (CTA) forward osmosis (FO) membrane. The coating process is facial and fast and can be finished in about only 90 seconds. Characterizations such as fourier-transform infrared spectroscopy (FTIR) and x-ray photoelectron spectroscopy (XPS) were used to confirm the successful deposition of the coating layer onto the membrane. The water permeability of the coated membrane was almost the same as that of the pure FO membrane since the water resistance of the coating layer is very small. When using NaCl solution and DI water as the draw and feed solutions, respectively, the water flux of the coated membrane in FO was the same with the pure FO membrane. In our 12-hour fouling test, the relative water flux (the ratio of the final water flux to the initial water flux) for the membrane without coating decreased from 1 to about 0.4. For our membrane with coating layer on the supporting layer side, the relative water flux was higher than 0.5 after the test meaning that our coated membrane has an enhanced antifouling property. Therefore, we provide a potential coating method to solve the common trade-off problem between water flux and antifouling property in osmotic pressure driven membrane processes.

Novel TA acid-metal complex coating layer for forward osmosis membrane with enhanced antifouling property

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.