Abstract

BARREZUETA-UNDA, Salomon; BONILLA, Hugo Romero  and  HIDALGO, Maylin Ríos. Key features of the biochar derived from Theobroma cacao L. residues for use on agricultural soils. Rev.Colomb.Quim. [online]. 2023, vol.52, n.1, pp.19-24.  Epub Mar 06, 2024. ISSN 0120-2804.  https://doi.org/10.15446/rev.colomb.quim.v52n1.110591.

Using biochar to enhance agricultural soils is becoming more popular, but not much is known about the qualities of biochar made from cocoa crop leftovers. The study identified several traits of biochar created from cocoa pod husks through the pyrolysis method. The examination included the following evaluations: levels of lignocellulosic fibre, proximal analysis, microscopic structure, and functional groups. The Langmuir and Freundlich isotherms were evaluated through an aqueous recirculation Cd2+ adsorption assay. The fibrous contents consisted of 56.2% cellulose, 27.07% lignin, and 3.15% hemicellulose. At a moisture content of 8.15% and a pH of 9.86, 35.58% biochar was produced. The pores were not uniform in shape and contained hydroxyl, carboxyl and carbonate groups as identified. According to the isotherms, the Cd2+ that can be adsorbed is 0.280 mL/g at Langmuir, and the Cd2+ adsorption intensity is 0.06 at Freundlich. Even though the biochar had desirable properties for acidic soils, its ability to adsorb was restricted under the tested conditions.

Keywords : biomass; absorption isotherm; pyrolysis.

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