PDMS@MoS₂/GO Janus Membrane-Based Solar-Driven Interfacial Evaporation for High-Yield Water Purification

Area of Science:

• Materials Science
• Environmental Engineering
• Chemical Engineering

Background:

• Solar-thermal interfacial membrane evaporation (STIME) is effective for desalination but limited in heavy metal wastewater treatment.
• Developing integrated solutions for simultaneous water purification and contaminant removal is crucial.

Purpose of the Study:

• To develop a Janus membrane for efficient solar-driven water evaporation and simultaneous heavy metal ion (Cu2+, Pb2+) adsorption.
• To investigate the adsorption mechanism and the role of STIME in enhancing purification efficiency.

Main Methods:

• Fabrication of a poly(dimethylsiloxane) (PDMS)@MoS2/GO (P@MS/G) Janus membrane.
• Characterization of membrane performance for solar evaporation and heavy metal adsorption.
• Utilizing molecular dynamics (MD) simulations to elucidate adsorption mechanisms.

Main Results:

• The P@MS/G membrane achieved an evaporation rate of 2.07 kg m-2 h-1 and 90.16% solar-to-vapor efficiency.
• Graphene oxide (GO) functional groups provided excellent adsorption for Cu2+ and Pb2+ via an endothermic process.
• STIME conditions (elevated temperature and ion concentration) promoted heavy metal adsorption.

Conclusions:

• The developed Janus membrane effectively integrates solar evaporation with heavy metal adsorption for water purification.
• Molecular dynamics simulations confirmed that increased temperature enhances ion diffusion and adsorption capacity.
• This technology presents a promising pathway for sustainable and accessible clean water solutions.