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MXene-Coated Membranes for Autonomous Solar-Driven Desalination
Mustakeem Mustakeem1, Jehad K El-Demellawi2, M Obaid1
1Water Desalination and Reuse Center (WDRC), Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology, (KAUST), Thuwal 23955-6900, Saudi Arabia.
ACS Applied Materials & Interfaces
|January 21, 2022
Summary
Solar-powered photothermal membrane distillation (PMD) offers a cost-effective solution for off-grid clean water. Ti3C2Tx MXene-coated membranes efficiently produce potable water using abundant solar energy.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Off-grid clean water access is crucial for socio-economic development in remote, solar-rich areas.
- Existing desalination technologies are often expensive or complex for remote applications.
- Photothermal membrane distillation (PMD) presents a promising, solar-driven alternative.
Purpose of the Study:
- To develop an efficient and cost-effective solar-driven desalination system for off-grid applications.
- To utilize Ti3C2Tx MXene's photothermal properties for enhanced membrane distillation.
- To assess the performance and efficiency of MXene-coated membranes for water production.
Main Methods:
- Coating commercial polytetrafluoroethylene (PTFE) membranes with Ti3C2Tx MXene.
- Implementing a photothermal membrane distillation (PMD) process utilizing solar irradiation.
- Evaluating water vapor flux, temporal response, and photothermal efficiency under varying conditions.
Main Results:
- Achieved an average water vapor flux of 0.77 kg/m2 h under one-sun irradiation.
- Demonstrated excellent temporal response under intermittent lighting.
- Attained a photothermal efficiency of 65.3% for a feed salinity of 0.36 g/L.
- Observed decreased efficiency at higher salinities (>10 g/L) due to reduced evaporation and light scattering.
Conclusions:
- Ti3C2Tx MXene-coated PTFE membranes enable efficient solar-driven PMD for clean water production.
- The developed membrane system can meet the daily potable water needs of a household (approx. 6 L/day per m2).
- This technology offers a sustainable and accessible solution for freshwater generation in off-grid locations.
