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Título: | Alkaline Modification of Arabica-Coffee and Theobroma-Cocoa Agroindustrial Waste for Effective Removal of Pb(II) from Aqueous Solutions |
Autor: | Lavado-Meza, Carmencita; De la Cruz-Cerrón, Leonel; Asencios, Yvan J. O.; Marcos, Francielle Candian Firmino; Dávalos, J.Z. CSIC ORCID | Palabras clave: | Pb(II) removal Agroindustrial waste Biosorption Heavy metals |
Fecha de publicación: | 10-ene-2023 | Editor: | Molecular Diversity Preservation International | Citación: | Molecules 28(2): 683 (2023) | Resumen: | Arabica-coffee and Theobroma-cocoa agroindustrial wastes were treated with NaOH and characterized to efficiently remove Pb(II) from the aqueous media. The maximum Pb(II) adsorption capacities, qmax, of Arabica-coffee (WCAM) and Theobroma-cocoa (WCTM) biosorbents (qmax = 303.0 and 223.1 mg·g−1, respectively) were almost twice that of the corresponding untreated wastes and were higher than those of other similar agro-industrial biosorbents reported in the literature. Structural, chemical, and morphological characterization were performed by FT-IR, SEM/EDX, and point of zero charge (pHPZC) measurements. Both the WCAM and WCTM biosorbents showed typical uneven and rough cracked surfaces including the OH, C=O, COH, and C-O-C functional adsorbing groups. The optimal Pb(II) adsorption, reaching a high removal efficiency %R (>90%), occurred at a pH between 4 and 5 with a biosorbent dose of 2 g·L−1. The experimental data for Pb(II) adsorption on WACM and WCTM were well fitted with the Langmuir-isotherm and pseudo-second order kinetic models. These indicated that Pb(II) adsorption is a chemisorption process with the presence of a monolayer mechanism. In addition, the deduced thermodynamic parameters showed the endothermic (ΔH0 > 0), feasible, and spontaneous (ΔG0 < 0) nature of the adsorption processes studied. | Descripción: | 15 pags., 11 figs., 7 tabs. -- This article belongs to the Special Issue Lignocellulosic Biomass II | Versión del editor: | https://doi.org/10.3390/molecules28020683 | URI: | http://hdl.handle.net/10261/309834 | DOI: | 10.3390/molecules28020683 | E-ISSN: | 1420-3049 |
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Alkaline Modification.pdf | Artículo principal | 4,94 MB | Adobe PDF | Visualizar/Abrir |
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