Interfacial Solar Steam Generation Enables Fast-Responsive, Energy-Efficient, and Low-Cost Off-Grid Sterilization

Area of Science:

• * Renewable Energy Technologies
• * Public Health Engineering
• * Materials Science

Background:

• * Traditional steam sterilization relies heavily on electricity, limiting its accessibility in developing regions.
• * Lack of affordable and available sterilization methods in off-grid areas poses significant public health risks.
• * There is a critical need for sustainable, off-grid sterilization solutions.

Purpose of the Study:

• * To investigate the potential of interfacial solar steam generation for sterilization applications.
• * To demonstrate the feasibility of a low-cost, biochar-based solar sterilization system.
• * To evaluate the efficiency and effectiveness of solar-powered sterilization compared to conventional methods.

Main Methods:

• * Utilized biochar as a low-cost solar absorber for interfacial solar steam generation.
• * Developed and tested a proof-of-concept 10.5 L solar autoclave system.
• * Quantified sterilization cycle time, energy efficiency, and pathogen inactivation rates.

Main Results:

• * Achieved fast-responsive sterilization cycles as short as 8.4 minutes.
• * Demonstrated high energy efficiency with steam reaching 121 °C using only 100 J mL^-1.
• * Confirmed effective sterilization, achieving ≈99.999999% pathogen inactivation, surpassing FDA requirements.

Conclusions:

• * Interfacial solar steam generation presents a viable, energy-efficient, and rapid sterilization alternative.
• * The biochar-based solar autoclave offers a cost-effective and sustainable solution, especially for off-grid settings.
• * This technology holds significant promise for improving public health and safety in resource-limited areas.