CoO, Cu, and Ag Nanoparticles on Silicon Nanowires with Photocatalytic Activity for the Degradation of Dyes

Olda Alexia Cárdenas Cortez, José de Jesús Pérez Bueno (), Yolanda Casados Mexicano, Maria Luisa Mendoza López, Carlos Hernández Rodríguez, Alejandra Xochitl Maldonado Pérez, David Cruz Alejandre, Coraquetzali Magdaleno López, María Reina García Robles, Goldie Oza, José Germán Flores López and Hugo Ruiz Silva
Additional contact information
Olda Alexia Cárdenas Cortez: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
José de Jesús Pérez Bueno: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
Yolanda Casados Mexicano: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
Maria Luisa Mendoza López: Tecnológico Nacional de México, Instituto Tecnológico de Querétaro, Av. Tecnológico s/n Esq. M. Escobedo Col. Centro, Querétaro C.P. 76000, Mexico
Carlos Hernández Rodríguez: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
Alejandra Xochitl Maldonado Pérez: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
David Cruz Alejandre: Tecnológico Nacional de México, Instituto Tecnológico Superior de Poza Rica. lll Ver, Luis Donaldo Colosio s/n, Ejido Arroyo del Maíz, Poza Rica de Hidalgo, Veracruz C.P. 93230, Mexico
Coraquetzali Magdaleno López: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
María Reina García Robles: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
Goldie Oza: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
José Germán Flores López: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico
Hugo Ruiz Silva: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S. C., Parque Tecnológico Querétaro-Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico

Sustainability, 2022, vol. 14, issue 20, 1-23

Abstract: Photocatalytic semiconductors require maintaining stability and pursuing higher efficiencies. The studied systems were silicon nanowires (Si NWs ), silicon nanowires with cobalt oxide nanoparticles (Si NWs -CoO NPs ), and silicon nanowires with copper nanoparticles (Si NWs -Cu NPs ). Si NWs were synthesized by metal-assisted chemical etching (MACE) from silicon wafers keeping the remaining silver nanoparticles for all three sample types. The nanowires were about 23–30 µm in length. CoO NPs and Cu NPs were deposited on Si NWs by the autocatalytic reduction processes (electroless). There were many factors in the process that affect the resulting structures and degradation efficiencies. This work shows the degradation of methyl orange (MO) together with the chemisorption of methylene blue (MB), and rhodamine 6G (Rh6G) by direct illumination with visible radiation. The MO degradation kinetics were in the sequence Si NWs -Cu NPs (88.9%) > Si NWs (85.3%) > Si NWs -CoO NPs (49.3%), with the Si NWs -Cu NPs having slightly faster kinetics. However, Si NWs -CoO NPs have slow degradation kinetics. The chemisorptions of MB and Rh6G were Si NWs -Cu NPs (87.2%; 86.88%) > Si NWs (86%; 87%) > Si NWs -CoO NPs (17.3%; 12%), showing dye desorptions together with lower chemisorption capacities. This work shows iridescence in optical microscopy images by the visible light interference caused by the spaces between the nanowire bundles.

Keywords: nanowires; photocatalysis; silicon; water remediation; heterojunction; MACE (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:14:y:2022:i:20:p:13361-:d:944719

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