Waste-derived catalytic hydrochars from coffee grounds doped with BiOCl, CeO2, and α-Fe2O3: Structural insights and enhanced photocatalytic performance

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dc.contributor.affiliationAguilar-Maruri S.A., Center for Research and Graduate Studies, Faculty of Chemical Sciences, Autonomous University of San Luis Potosí, San Luis Potosí, 78260, Mexico, Department of Chemical Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
dc.contributor.affiliationRamos-Galicia L., Center for Research in Advanced Materials S.C., Monterrey Unit, Alianza Norte 202, Parque PIIT, Apodaca, C.P 66628, Mexico
dc.contributor.affiliationOcampo-Pérez R., Center for Research and Graduate Studies, Faculty of Chemical Sciences, Autonomous University of San Luis Potosí, San Luis Potosí, 78260, Mexico
dc.contributor.affiliationForgionny A., Grupo de investigación Materiales con Impacto (Mat&mpac), Facultad de Ciencias Básicas, Universidad de Medellín, Carrera 87 No. 30-65, Medellín, 050026, Colombia
dc.contributor.affiliationRuíz-Camacho B., Department of Chemical Engineering, Division of Natural and Exact Sciences, University of Guanajuat, Noria Alta S/n, Guanajuato, 36050, Mexico
dc.contributor.affiliationSerna-Carrizales J.C., Center for Research and Graduate Studies, Faculty of Chemical Sciences, Autonomous University of San Luis Potosí, San Luis Potosí, 78260, Mexico
dc.contributor.affiliationCabrera-Ruiz J., Department of Chemical Engineering, Division of Natural and Exact Sciences, University of Guanajuat, Noria Alta S/n, Guanajuato, 36050, Mexico
dc.contributor.affiliationLópez-Ortiz A., Centro de Investigación en Materiales Avanzados (CIMAV), S.C. Miguel de Cervantes 120, Complejo Industrial Chihuahua,Chihuahua, Chihuahua, 31136, Mexico
dc.contributor.affiliationPalestino G., Center for Research and Graduate Studies, Faculty of Chemical Sciences, Autonomous University of San Luis Potosí, San Luis Potosí, 78260, Mexico
dc.contributor.affiliationSano N., Department of Chemical Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
dc.contributor.authorAguilar-Maruri S.A.
dc.contributor.authorRamos-Galicia L.
dc.contributor.authorOcampo-Pérez R.
dc.contributor.authorForgionny A.
dc.contributor.authorRuíz-Camacho B.
dc.contributor.authorSerna-Carrizales J.C.
dc.contributor.authorCabrera-Ruiz J.
dc.contributor.authorLópez-Ortiz A.
dc.contributor.authorPalestino G.
dc.contributor.authorSano N.
dc.date.accessioned2025-09-08T14:23:31Z
dc.date.available2025-09-08T14:23:31Z
dc.date.issued2025
dc.descriptionIn this study, hydrochars were synthesized from coffee grounds via a solvothermal process and doped with metallic oxides, resulting in hydrochars being denoted as H, H-Bi (BiOCl), H-Bi/Ce (BiOCl-CeO2), and H-Bi/Fe (BiOCl-Fe2O3). The photocatalytic degradation of indigo blue dye was evaluated under UV light, with varying parameters such as pH (3, 7, and 11), initial hydrochar mass (0.1, 0.2, and 0.3 »g/L), and dye concentration (25-75 »mg/L). H is directly degraded by electron transfer and UV light, with limited reactive oxygen species (ROS) generation. H-Bi generates abundant •OH and O₂•⁻, with h⁺ predominating under alkaline conditions. H-Bi/Ce combines h⁺ and •OH due to oxygen defects in CeO₂. H-Bi/Fe utilizes Fenton and photo-Fenton reactions at acidic pH, with •OH being the primary mechanism. The highest degradation efficiency (100 »%) was achieved with H, H-Bi, and H-Bi/Fe, using 0.1 »g/L of hydrochar at pH 3. Under the same conditions, the hydrochars maintained their carbon-oxygen spherical structure and uniform dopant dispersion after four use cycles. Meanwhile, DRS, XPS, and TEM confirmed the presence of heterojunctions, which supported their photocatalytic activity. XPS and energy-EDS indicated the presence of BiOCl, CeO₂, and Fe₂O₃ after four cycles. The higher photocurrent density at 1.23 »V vs. RHE was obtained for H-Bi/Fe, demonstrating excellent electrochemical stability under light and a higher electron transfer resistance in basic electrolytes compared to an acid medium. These results demonstrate the effectiveness of these doped hydrochars, offering insights into the transformative potential of biomass-based composites for sustainable industrial applications. © 2025 Elsevier Ltd.
dc.identifier.doi10.1016/j.jece.2025.117799
dc.identifier.instnameinstname:Universidad de Medellínspa
dc.identifier.issn22133437
dc.identifier.reponamereponame:Repositorio Institucional Universidad de Medellínspa
dc.identifier.repourlrepourl:https://repository.udem.edu.co/
dc.identifier.urihttps://hdl.handle.net/11407/9066
dc.language.isoeng
dc.publisher.facultyFacultad de Ciencias Básicasspa
dc.relation.citationissue5
dc.relation.citationvolume13
dc.relation.isversionofhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-105011070846&doi=10.1016%2fj.jece.2025.117799&partnerID=40&md5=f01122a2aa83b6c7dde433f15c6430a9
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dc.rights.accesoRestricted access
dc.rights.accessrightsinfo:eu-repo/semantics/restrictedAccess
dc.sourceJournal of Environmental Chemical Engineering
dc.sourceJ. Environ. Chem. Eng.
dc.sourceScopus
dc.subjectBiOCl
dc.subjectCoffee grounds
dc.subjectHydrochar
dc.subjectIndigo blue
dc.subjectPhotodegradation
dc.subjectWaste-derived
dc.subjectAlkalinity
dc.subjectBinary alloys
dc.subjectBismuth alloys
dc.subjectBismuth compounds
dc.subjectCarbon
dc.subjectCerium oxide
dc.subjectChlorine compounds
dc.subjectDoping (additives)
dc.subjectDyes
dc.subjectElectron transitions
dc.subjectHeterojunctions
dc.subjectIron oxides
dc.subjectOxidation
dc.subjectOxygen
dc.subjectPhotocatalytic activity
dc.subjectSustainable development
dc.subjectCeO 2
dc.subjectCoffee grounds
dc.subjectHydrochar
dc.subjectIndigo blue
dc.subjectPhoto degradation
dc.subjectPhotocatalytic performance
dc.subjectStructural insights
dc.subjectUV-light
dc.subjectWaste-derived
dc.subjectα-Fe
dc.subjectPhotodegradation
dc.titleWaste-derived catalytic hydrochars from coffee grounds doped with BiOCl, CeO2, and α-Fe2O3: Structural insights and enhanced photocatalytic performance
dc.typeArticle
dc.type.localArtículospa
dc.type.versioninfo:eu-repo/semantics/publishedVersion

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