Monteagudo et al. (2024): Investigation of effectiveness of KOH-activated olive pomace biochar for efficient direct air capture of CO2

J.M. Monteagudo, A. Durán, M. Alonso, Anca-Iulia Stoica IN: Separation and Purification Technology, 352, 127997, https://doi.org/10.1016/j.seppur.2024.127997

In this work, the activation of olive pomace biochar with potassium hydroxide, KOH, has been studied for its use as a CO₂ adsorbent. The effectiveness of biochar activated with KOH at 750 °C in an inert N₂ atmosphere was evaluated, using different mass ratios of biochar/KOH, 1:0.5, 1:1, and 1:2. Various characterisation analyses of the biochar were performed to determine its chemical composition, specific surface area, pore size and volume, structure, morphology, and functional groups. The adsorption isotherm was determined at atmospheric pressure and a temperature of 10 °C. The experimental equilibrium results were fitted to the Langmuir, Freundlich, and Temkin models. Additionally, the kinetic behavior of biochar/KOH as an adsorbent was studied, and dynamic experiments were conducted at atmospheric pressure and 10 °C.

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