Development of Pistachio Shell-Based Bioadsorbents Through Pyrolysis for CO2 Capture and H2S Removal
Year: 2025
Type: article
Abstract: The development of sustainable waste management for environmental remediation has highlighted the potential of biochar produced from agricultural wastes as an effective adsorbent for gas pollutant capture. This work focuses on the production and activation of biochar derived from pistachio shells for CO2 and H2S adsorption. Adsorbents were obtained by pyrolysis and subsequently activated through two methods: chemical activation with KOH and physical activation with CO2. Adsorption studies were conducted to evaluate the influence of these activation methods on textural properties and adsorption capacities. Chemical activation enhanced microporosity and increased the specific surface area (531 m2/g), resulting in a better performance, obtaining adsorption capacities of 87 mgCO2/gadsorbent and 9.6 mgH2S/gadsorbent. Non-linear kinetic models were identified as the most suitable for fitting CO2 adsorption data, with the Avrami model presenting the best fit results. Dynamic H2S adsorption tests revealed the influence of moisture present in the adsorbent, favoring H2S dissociation and thus improving capture processes, especially when chemical activation biochar is employed. This enhancement is attributed to the greater development of active centers on its surface, including micropores and heterogeneous atoms introduced though impregnation.
Source: Molecules
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,258
Awards: G4310674237, G4929314024
OpenAlex ID: W4408947603