Improved Flux Performance in Brackish Water Reverse Osmosis Membranes by Modification with ZnO Nanoparticles and...

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Increasing global water scarcity necessitates advanced water purification technologies.
• Reverse osmosis (RO) is a key technology for desalination, but efficiency improvements are needed.
• Nanomaterial integration offers a pathway to enhance RO membrane performance.

Purpose of the Study:

• To modify brackish water (BW30) membranes using zinc oxide (ZnO) nanoparticles.
• To evaluate the performance of modified membranes for brackish water treatment.
• To assess the impact of ZnO nanoparticles on permeate flux, salt rejection, and concentration polarization.

Main Methods:

• Interphase polymerization was used to incorporate ZnO nanoparticles onto BW30 membranes.
• Membrane characterization included FTIR, AFM, contact angle, and micrometer analysis.
• Performance testing involved a cross-flow apparatus with 9000 ppm brackish water.

Main Results:

• The ZnO nanoparticle-modified membrane achieved high salt rejection rates (97.13–97.77%), suitable for drinking water production.
• An improved permeate flux of 122.63 L m⁻² h⁻¹ was observed at 6.24 MPa and 30 Hz, a 12.2% increase over the unmodified BW30 membrane.
• Increased concentration polarization was noted under tested conditions.

Conclusions:

• ZnO nanoparticle modification is an effective strategy to enhance reverse osmosis membrane performance for water purification.
• The improved permeate flux and high salt rejection demonstrate the potential of nanomaterial-enhanced membranes for addressing water scarcity.
• Further research may optimize conditions to mitigate increased concentration polarization.