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Volume 14
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10.3390/coatings14070919
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Article

Synthesis and Characterization of SiO2 Nanoparticles for Application as Nanoadsorbent to Clean Wastewater

by
Nora Elizondo-Villarreal
1,*,
Eleazar Gandara-Martínez
1,*,
Manuel García-Méndez
1,
Miguel Gracia-Pinilla
1,
Ana María Guzmán-Hernández
2,
Víctor M. Castaño
3 and
Cristian Gómez-Rodríguez
4
1
Physical Mathematical Scientific Research Center (CICFIM), Universidad Autónoma de Nuevo León, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico
2
Materials Engineering Department, Universidad Autónoma de Nuevo León, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico
3
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Juriquilla 76230, Querétaro, Mexico
4
Faculty of Engineering, University of Veracruz (Coatzacoalcos), Av. Universidad km 7.5 Col. Santa Isabel, Coatzacoalcos 96535, Veracruz, Mexico
*
Authors to whom correspondence should be addressed.
Coatings 2024, 14(7), 919; https://doi.org/10.3390/coatings14070919
Submission received: 7 June 2024 / Revised: 12 July 2024 / Accepted: 14 July 2024 / Published: 22 July 2024
(This article belongs to the Special Issue Advanced Technology in Environmental Remediation and Resource Utilization, 2nd Edition)
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Abstract

By way of the sol–gel chemical synthesis method, it is possible to synthesize SiO2 nanoparticles with a defined specific particle size, a surface area, and a defined crystal structure that can be effectively used as a nanoadsorbent to remove various organic dyes. SiO2 nanoparticles were synthesized by the sol–gel method using sodium silicate (Na2SiO3) by a green method without using a tetraethyl orthosilicate (TEOS) precursor, which is very expensive and highly toxic. This sol–gel process involves the formation of a colloidal suspension (sol) and solid gelation to form a network in a continuous liquid phase (gel). In addition, it requires controlled atmospheres. XRD indicates the presence of an amorphous phase with a diffraction angle of 2θ = 23°, associated with SiO2. UV-Vis spectroscopy reveals an absorbance value in the region of 200 nm to 300 nm, associated with SiO2 nanoparticles. The application as a nanoadsorbent to remove dyes was measured, and it was found that the nanoparticles with the best performance were those that were synthesized with pH 7, showing a 97% removal with 20 mg of SiO2 nanoparticles in 60 min. Therefore, SiO2 nanoparticles can be used as a nanoadsorbent, using a low-cost and scalable method for application to remove methylene blue in an aqueous medium.
Keywords: SiO2; nanoadsorbent; sol–gel; cleaning; wastewater SiO2; nanoadsorbent; sol–gel; cleaning; wastewater

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MDPI and ACS Style

Elizondo-Villarreal, N.; Gandara-Martínez, E.; García-Méndez, M.; Gracia-Pinilla, M.; Guzmán-Hernández, A.M.; Castaño, V.M.; Gómez-Rodríguez, C. Synthesis and Characterization of SiO2 Nanoparticles for Application as Nanoadsorbent to Clean Wastewater. Coatings 2024, 14, 919. https://doi.org/10.3390/coatings14070919

AMA Style

Elizondo-Villarreal N, Gandara-Martínez E, García-Méndez M, Gracia-Pinilla M, Guzmán-Hernández AM, Castaño VM, Gómez-Rodríguez C. Synthesis and Characterization of SiO2 Nanoparticles for Application as Nanoadsorbent to Clean Wastewater. Coatings. 2024; 14(7):919. https://doi.org/10.3390/coatings14070919

Chicago/Turabian Style

Elizondo-Villarreal, Nora, Eleazar Gandara-Martínez, Manuel García-Méndez, Miguel Gracia-Pinilla, Ana María Guzmán-Hernández, Víctor M. Castaño, and Cristian Gómez-Rodríguez. 2024. "Synthesis and Characterization of SiO2 Nanoparticles for Application as Nanoadsorbent to Clean Wastewater" Coatings 14, no. 7: 919. https://doi.org/10.3390/coatings14070919

APA Style

Elizondo-Villarreal, N., Gandara-Martínez, E., García-Méndez, M., Gracia-Pinilla, M., Guzmán-Hernández, A. M., Castaño, V. M., & Gómez-Rodríguez, C. (2024). Synthesis and Characterization of SiO2 Nanoparticles for Application as Nanoadsorbent to Clean Wastewater. Coatings, 14(7), 919. https://doi.org/10.3390/coatings14070919

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