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Photocatalytic activity of TiO2 synthesized by anodization and anodic spark deposition

Published online by Cambridge University Press:  06 November 2020

Alma C. Chávez-Mejía ,
Génesis Villegas-Suárez ,
Paloma I. Zaragoza-Sánchez Open the ORCID record for Paloma I. Zaragoza-Sánchez [Opens in a new window] ,
Rafael Magaña-López ,
Julio C. Morales-Mejía  and
Blanca E. Jiménez-Cisneros
Alma C. Chávez-Mejía*
Affiliation:
Instituto de Ingeniería, Universidad Nacional Autónoma de México Av. Universidad 3000, UNAM CU, Coyoacán, 04510, Mexico
Génesis Villegas-Suárez
Affiliation:
Instituto de Ingeniería, Universidad Nacional Autónoma de México Av. Universidad 3000, UNAM CU, Coyoacán, 04510, Mexico
Paloma I. Zaragoza-Sánchez
Affiliation:
Instituto de Ingeniería, Universidad Nacional Autónoma de México Av. Universidad 3000, UNAM CU, Coyoacán, 04510, Mexico
Rafael Magaña-López
Affiliation:
Instituto de Ingeniería, Universidad Nacional Autónoma de México Av. Universidad 3000, UNAM CU, Coyoacán, 04510, Mexico
Julio C. Morales-Mejía
Affiliation:
Facultad de Estudios Superiores Cuautitlán (UNAM). Av. 1° de mayo s/n, Santa María las Torres, Cuautitlán Izcalli, 54760, Mexico
Blanca E. Jiménez-Cisneros
Affiliation:
Instituto de Ingeniería, Universidad Nacional Autónoma de México Av. Universidad 3000, UNAM CU, Coyoacán, 04510, Mexico
*
*Corresponding author: [email protected]
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Abstract

Several photocatalysts, based on titanium dioxide, were synthesized by spark anodization techniques and anodic spark oxidation. Photocatalytic activity was determined by methylene blue oxidation and the catalytic activities of the catalysts were evaluated after 70 hours of reaction. Scanning Electron Microscopy and X Ray Diffraction analysis were used to characterize the catalysts. The photocatalyst prepared with a solution of sulfuric acid and 100 V presented the best performance in terms of oxidation of the dye (62%). The electric potential during the synthesis (10 V, low potential; 100 V, high potential) affected the surface characteristics: under low potential, catalyst presented smooth and homogeneous surfaces with spots (high TiO2 concentration) of amorphous solids; under low potential, catalyst presented porous surfaces with crystalline solids homogeneously distributed.

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Articles
Information
MRS Advances , Volume 5 , Issue 61: International Materials Research Congress XXIX , 2020 , pp. 3141 - 3152
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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