Effect of the synthesis variables of TiO2 on the photocatalytic activity towards the degradation of water pollutants


  • Camilo Andrés Castro López Industrial University of Santander
  • Sonia Esperanza Reyes Gómez Industrial University of Santander
  • Aristóbulo Centeno Hurtado Industrial University of Santander
  • Sonia Azucena Giraldo Duarte Industrial University of Santander




TiO2, photocatalytic oxidation, sol-gel, hydrothermal synthesis, orange II


In this work, TiO2 photocatalysts were synthesized using a conventional sol-gel and hydrothermal synthesis methods with steam pressure treatment. Photocatalysts were characterized by X-ray diffraction (XRD), diffuse reflectance spectra (DRS) and N2 adsorption-desorption. The photoactivity of the samples was analyzed towards the photooxidation of the azo dye Orange II (Or-II) and phenol using different illumination set-ups to compare the activity features of photocatalysts. The effect of the synthesis variables such as the synthesis route, water/alcoxide and alcohol/alcoxide ratios, as well as the alcohol type was analyzed. TiO2 photocatalysts obtained by hydrothermal synthesis have a better photoactivity than the particles synthesized by the chosen sol-gel route, reaching the Or-II degradation photoactivity of the commercial TiO2 P25. On the other hand, the water/alcoxide ratio and alcohol type have a marked effect on the photoactivity of the hydrothermal synthesized TiO2, whereas the alcohol/alcoxide ratio does not have a relevant effect on the Or-II degradation photoactivity.

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Author Biographies

Camilo Andrés Castro López, Industrial University of Santander

Catalysis Research Center (CICAT), School of Chemical Engineering.

Sonia Esperanza Reyes Gómez, Industrial University of Santander

Catalysis Research Center (CICAT), School of Chemical Engineering.

Aristóbulo Centeno Hurtado, Industrial University of Santander

Catalysis Research Center (CICAT), School of Chemical Engineering.

Sonia Azucena Giraldo Duarte, Industrial University of Santander

Catalysis Research Center (CICAT), School of Chemical Engineering.


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How to Cite

Castro López, C. A., Reyes Gómez, S. E., Centeno Hurtado, A., & Giraldo Duarte, S. A. (2013). Effect of the synthesis variables of TiO2 on the photocatalytic activity towards the degradation of water pollutants. Revista Facultad De Ingeniería Universidad De Antioquia, (57), 49–56. https://doi.org/10.17533/udea.redin.14643

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