Scientists have developed an energy-efficient method to capture carbon dioxide directly from the air using hydroxide-loaded charcoal ‘sponges’. This approach utilizes activated carbon’s porous structure and conductivity for rapid uptake and easy regeneration.
Activated Carbon Application
Activated carbon, chosen for its affordability and scalability, effectively binds with carbon dioxide when immersed in a hydroxide ion electrolyte. This setup prepares the sponge to capture carbon dioxide upon exposure to air.
Efficiency and Reusability
Each 100g of sponge captures about 1g of carbon dioxide. Regeneration involves applying a voltage to heat the sponge to 90-100 ºC, significantly reducing energy use compared to traditional methods.
Expert Insights
Susana García from Heriot Watt University praises the method for its efficient carbon dioxide recovery and minimal energy requirements during regeneration. Camille Petit of Imperial College London highlights potential energy savings through electric voltage-induced resistive heating.
Challenges and Future Prospects
Despite lower capacity in high humidity, the system’s adaptability, quick kinetics, and ease of use show promise for future carbon capture advancements.
Conclusion
Hydroxide-loaded charcoal sponges represent a significant breakthrough in carbon capture technology, offering a cost-effective and efficient solution to reduce atmospheric carbon dioxide levels and combat climate change globally.
