Desalination Performance of MoS₂ Membranes with Different Single-Pore Sizes: A Molecular Dynamics Simulation Study

Area of Science:

• Materials Science
• Nanotechnology
• Computational Chemistry

Background:

• Molybdenum disulfide (MoS2) nanosheets show promise for water desalination.
• Optimizing membrane performance requires understanding the impact of pore structure.

Purpose of the Study:

• To investigate how varying single-pore sizes influence MoS2 membrane desalination performance.
• To identify the optimal single-pore area for enhanced water flux and ion rejection.

Main Methods:

• Molecular dynamics simulations were employed.
• MoS2 membranes with a constant total pore area (200 Ų) and varied single-pore areas (20-60 Ų) were simulated.
• Water flux and ion rejection rates were analyzed.

Main Results:

• Increasing single-pore area enhanced water flux and water molecule velocity while decreasing the energy barrier.
• A single-pore area of 40 Ų demonstrated the most effective balance between water flux and ion rejection.
• Lower valence ions showed reduced rejection rates due to smaller mass and radius.

Conclusions:

• A 40 Ų single-pore size is optimal for MoS2 membrane desalination.
• MoS2 membrane performance is influenced by ion valence, with higher valence ions being rejected more effectively.
• These findings provide theoretical guidance for designing advanced MoS2 membranes for water treatment.