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Engineering Hierarchically Grooved Structures for Enhancing Interfacial Solar Thermal Water Purification.

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Summary

This study introduces a novel solar evaporator using a titanium dioxide (TiO2) and zinc oxide (ZnO) coating on aluminum substrates for efficient water purification. The enhanced material offers corrosion resistance and pollutant degradation, extending evaporator lifespan for sustainable water treatment.

Keywords:
antibiosisinterfacial engineeringphotodegradationrenewabilitysolar water purification

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Photocatalysis

Background:

  • Inclined interfacial solar evaporators, particularly those using microgrooved aluminum (Al) substrates, are promising for water purification.
  • Performance degradation due to corrosion and contamination limits the service life of these solar evaporators.
  • There is a need for strategies to enhance the durability and efficiency of solar evaporators for polluted water treatment.

Purpose of the Study:

  • To develop a durable and efficient solar evaporator for purifying polluted water.
  • To improve the anticorrosion properties and antibacterial capabilities of microgrooved Al substrates.
  • To enhance the degradation of organic pollutants and prolong the service life of solar evaporators.

Main Methods:

  • Fabrication of a renewable heterojunction using atomic layer deposition (ALD) with titanium dioxide (TiO2) as the inner layer and zinc oxide (ZnO) as the outer layer on microgrooved Al substrates.
  • Evaluation of anticorrosion protection, antibacterial activity against adhered and planktonic bacteria.
  • Assessment of photoinduced reactive oxide species generation for organic pollutant degradation and improvement of water evaporation rate through enhanced wicking and photothermal conversion.

Main Results:

  • The TiO2/ZnO heterojunction provided effective anticorrosion protection and demonstrated efficient killing of adhered and planktonic bacteria.
  • The heterojunction generated abundant photoinduced reactive oxide species, leading to the degradation of organic pollutants.
  • Enhanced water wicking and photothermal conversion improved the water evaporation rate, and photodegradation/hydroxyl radical regeneration endowed the substrates with renewable wicking performance and prolonged service life.

Conclusions:

  • The developed renewable TiO2/ZnO heterojunction on microgrooved Al substrates offers a practical strategy to improve the performance and extend the service life of inclined interfacial solar evaporators.
  • This approach effectively addresses corrosion and contamination issues, enabling efficient purification of polluted water.
  • The findings contribute to the advancement of solar-driven water treatment technologies for sustainable water resource management.