Adaptive and Multifunctional Emulsion Solar Evaporators with High Operating Stability in Extreme Environments

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Global water scarcity and pollution necessitate advanced sustainable clean water production technologies.
• Interfacial solar evaporation is promising but limited by evaporator stability in harsh conditions.
• Existing solar evaporators struggle with oil contamination, salt accumulation, and biofouling.

Purpose of the Study:

• To develop a highly adaptive, liquid-like, multifunctional Pickering emulsion solar evaporator.
• To address the limitations of conventional solid-state solar evaporators.
• To achieve stable, ultrahigh-rate clean water production from contaminated water sources.

Main Methods:

• Formation of a Pickering emulsion solar evaporator in situ or preconstructed with optimized rheology.
• Utilizing multidirectional water transport, enhanced thermal localization, and controllable salt deposition.
• Testing under hypersaline conditions (26 wt.%) and elevated solar irradiation (11 kW cm⁻²).

Main Results:

• Achieved stable, ultrahigh-rate evaporation (12.5 kg m⁻² h⁻¹) even in hypersaline conditions.
• Successfully integrated oil contaminants without efficiency loss and inhibited salt accumulation.
• Demonstrated degradation of organic pollutants (nearly 100% phenol removal), bacterial deactivation, and biofouling prevention.
• Exhibited gravity-assisted self-cleaning and phase transformation for easy recovery and recycling.

Conclusions:

• The developed emulsion evaporator offers a versatile and sustainable platform for clean water production in challenging environments.
• This technology overcomes limitations of conventional solid-state evaporators, providing enhanced performance and multifunctionality.
• The adaptive, liquid-like nature enables flexible deployment and efficient contaminant management.