Titanium nitride nanoparticle embedded membrane for photothermal membrane distillation.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Growing global demand for freshwater necessitates efficient desalination of saline water.
• Solar membrane distillation (MD) offers a sustainable, low-cost alternative to conventional desalination methods.
• Improving solar energy utilization is key to enhancing MD efficiency.

Purpose of the Study:

• To develop a cost-effective, high-efficiency photothermal membrane for solar MD.
• To investigate the performance of TiN nanoparticles in solar energy absorption and conversion.
• To assess the impact of the photothermal membrane on water production and energy efficiency.

Main Methods:

• Fabrication of a photothermal membrane using TiN nanoparticles on a PVDF base.
• Characterization of the membrane's photothermal properties and solar energy conversion.
• Performance evaluation of the membrane in a solar membrane distillation setup under simulated solar irradiation (1.0 kW/m²).
• Comparison of water flux and solar efficiency with a bare PVDF membrane.

Main Results:

• The TiN-based photothermal membrane exhibited a strong photothermal effect, significantly improving solar energy efficiency.
• An MD flux of 0.940 kg/m²·h and a solar efficiency of 64.1% were achieved under optimal conditions.
• The photothermal membrane produced 65.8% more pure water compared to a bare PVDF membrane.
• Reduced temperature polarization due to interfacial heating contributed to high solar efficiency.
• The membrane demonstrated stability and produced high-quality potable water.

Conclusions:

• The developed photothermal membrane is cost-effective and highly efficient for solar MD.
• TiN nanoparticles effectively enhance solar energy absorption and conversion for desalination.
• The membrane shows significant potential for practical application in solar-powered water purification.