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Sustainable Solar Evaporation while Salt Accumulation.

Yue Bian1, Kun Tang1, Liyan Tian2

  • 1School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.

ACS Applied Materials & Interfaces
|January 12, 2021
PubMed
Summary

A novel solar thermal photo vapor generator (STPV) overcomes salt accumulation issues, enabling stable freshwater production from saline water. This innovation offers a sustainable solution for global water scarcity.

Keywords:
desalinationsalt accumulationsolar thermal photo vaporstable evaporationthermal management

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Environmental Science

Background:

  • Solar-driven water evaporation is crucial for freshwater production but hindered by salt accumulation.
  • Conventional solar thermal vapor generators suffer from reduced efficiency due to salt buildup.

Purpose of the Study:

  • To develop a solar thermal photo vapor generator (STPV) that stably evaporates water despite salt accumulation.
  • To investigate the mechanisms behind stable vapor generation in the presence of high salt concentrations.

Main Methods:

  • Utilized infrared photons as the heat source for water evaporation.
  • Engineered a porous structure within the salt layer to facilitate vapor escape.
  • Tested the STPV's performance in highly concentrated sea salt solutions (20 wt %) under simulated solar illumination (2 sun).

Main Results:

  • The STPV achieved a stable evaporation rate of 1.04-1.19 kg m⁻² h⁻¹ over 8 hours.
  • Conventional solar thermal vapor generators showed a >50% decrease in evaporation rate within 1 hour and ≈70% over 8 hours.
  • The STPV demonstrated effective energy utilization due to low infrared reflection of wet salt and unimpeded vapor escape.

Conclusions:

  • The developed STPV offers a stable and efficient method for solar-driven water desalination, overcoming salt accumulation challenges.
  • This technology holds significant potential for advancing solar evaporation systems to address global water scarcity.
  • The findings pave the way for future designs of more robust and effective solar evaporators.