Termanalia arjuna Waste Biomass‐Derived Porous Activated Carbons for Efficient CO₂ Capture

Abstract

Abstract Sustainable activated carbons (ACs) with high specific surface areas were successfully prepared from Termanalia arjuna (TA) biomass using H 3 PO 4 as activating agent in a simple two‐step activation‐carbonization procedure. The effects of the synthesis parameters on their CO 2 capture ability were also examined. The ratio of biomass to activating agent mass was 1:3, and the carbonization at 800 °C for 4 h exhibited a great potential for CO 2 uptake. Maximum CO 2 uptake was achieved under ambient conditions. Recyclability up to five cycles with marginal change could be achieved. The high performance of CO 2 adsorption capacity is due to better microporosity and the presence of basic oxygen functional groups on the carbon surfaces.