Dry Capture of Low-level CO2 from Public Indoor Spaces using Chemically Modified Carbonaceous Adsorbents - A Review

• Published in: Asian journal of atmospheric environment (Online) Vol. 15; no. 1; pp. 1 - 13
• Main Authors: Heo, Sujeong, Kim, Wooram, Lee, Tae Jung, Adelodun, Adedeji A., Jo, Young Min
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.03.2021; Springer; 한국대기환경학회
• Subjects: Activated carbon; Activated carbon fiber; CO2 adsorption; Indoor Air Quality; Review Article; Surface Chemistry; 대기과학; Indoor Air Quality; Surface Chemistry; adsorption; CO; Activated carbon; Activated carbon fiber
• ISSN: 1976-6912; 2287-1160
• DOI: 10.5572/ajae.2020.132

Although CO 2 is prominent as the most important greenhouse gas, responsible for 64% of anthropogenic global warming, it is also a viable indicator for indoor air quality (IAQ). Due to the incessant increase in the human population and residence time indoors, the need to control indoor CO 2 levels has become exigent. To this effect, dryphase removal technology via adsorption with zeolites, activated carbons (AC) and activated carbon fibers (ACFs) had sufficed. Chemically modified AC and ACF surfaces through alkali impregnation have been used to improve their selectivity toward CO 2 at room temperature. Here we appraise the various methods in the literature and carry out performance evaluation based on the physical and chemical modification induced by the chemical agents and experimental conditions. This study reviews the improved adsorption of low concentration (0.3%) via surface reformation of commercial carbon-based adsorbents, and the highest adsorption capacity was 2.2 mmol/g CO 2 at the indoor level, which was achieved by AC pellets doped with ammine functionalities.