Investigating direct air capture of carbon dioxide using alkali dosed biochar-based adsorbent

Abstract As a response to the urgent need for global climate change mitigation, negative emissions technologies have gained widespread recognition as essential tools for achieving climate goals. Among these technologies, direct air capture (DAC) and biochar are considered promising methods for carbon capture, contributing to the reduction of carbon dioxide emissions into the atmosphere. Biochar stands out as an environmentally friendly and cost-effective adsorbent for DAC. While both DAC and biochar technologies have undergone extensive research, limited attention has been given to the potential of using alkali-dosed biochar as a sorbent for DAC, with most validation conducted at laboratory level. This study focuses on the DAC of CO 2 using a KOH-dosed biochar-based adsorbent and introduces a mobile prototype designed to accommodate a portable biochar filter. Our research explores the viability of this innovative approach for carbon capture, offering a possible solution for sectors with limited financial resources and the public.