Utilization of camalote grass (Paspalum fasciculatum Willd. Ex Flüggé) for biosilica recovery through green pretreatment and thermal processing

José Pablo Cortazar-Romero; Cintya Valerio-Cárdenas; Zaritma Yamilet Montejo-García

Authors

José Pablo Cortazar-Romero Universidad Popular de la Chontalpa
Cintya Valerio-Cárdenas Universidad Popular de la Chontalpa
Zaritma Yamilet Montejo-García Universidad Autónoma de Tabasco

Keywords:

Silica, biomass, x-ray diffraction, acidic active sites

Abstract

Camalote grass (Paspalum fasciculatum Willd. Ex Flüggé, Poaceae) is abundant in southeastern Mexico, and its residues are not currently utilized for economic purposes. However, the generated biomass is rich in silica, allowing it to be integrated into value-added processes. Silica has a wide range of applications. In this study, silica was extracted from the root, stem, and leaf of Camalote grass using a thermochemical method. Proximate analyses revealed ash contents of 32.42 % in roots, 7.12 % in stems, and 19.56 % in leaves. The silica present in the ashes was characterized by powder X-ray diffraction (XRD), where a broad band at 2θ = 22° was observed in leaf and stem samples, corresponding to amorphous silica, while sharp peaks at 2θ = 26.6° were detected root-derived silica, indicating crystalline phases. Leaf-derived ash exhibited a higher density of acidic active sites, which is associated with the presence of surface silanols groups (Si-OH).

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