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Effect of TiO2 surface modification in Rhodamine B photodegradation

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Abstract

Commercial TiO2 nanoparticles were superficially modified through polymeric resins obtained from polymerization of citrate complexes of Y3+ and Al3+ with ethylenglycol. The materials were treated at 450 °C for 4 h to obtain modified nanoparticles, which were characterized by HR-TEM, Zeta potential and surface area through N2 fisisorption. Rhodamine B photodegradation by visible light irradiation and in presence of those modified nanoparticles was compared with the same process in presence of unmodified commercial TiO2 nanoparticles. It was observed, by UV–visible spectroscopy, that the catalytic photoactivity in presence of modified nanoparticles was smaller than that observed with commercial TiO2 nanoparticles. However, the surface modifier played an important role in the photodegradation kinetic process, showing a non-linear relation between modifier amount and photodegradation rate, presenting a maximum value at 0.8% (w/w).

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Acknowledgements

The financial backing of the Brazilian agencies FAPESP (project no. 2005/56120-8) and CNPq (project no. 555689/2006-9) is gratefully acknowledged.

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Authors and Affiliations

  1. CMDMC/LIEC/UFSCar, Rod. Washington Luís, km 235, Sao Carlos, SP, 13565-905, Brazil

    Rafael Libanori & Edson R. Leite

  2. Embrapa Instrumentação Agropecuária, Rua XV de Novembro, 1452, Sao Carlos, SP, 13560-970, Brazil

    Tania R. Giraldi & Caue Ribeiro

  3. CMDMC/LIEC/UNESP, R. Francisco Degni, s/n, Quitandinha, Araraquara, SP, 14800-900, Brazil

    Elson Longo

Authors
  1. Rafael Libanori
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  2. Tania R. Giraldi
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  3. Elson Longo
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  4. Edson R. Leite
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  5. Caue Ribeiro
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Correspondence to Rafael Libanori.

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Libanori, R., Giraldi, T.R., Longo, E. et al. Effect of TiO2 surface modification in Rhodamine B photodegradation. J Sol-Gel Sci Technol 49, 95–100 (2009). https://doi.org/10.1007/s10971-008-1821-1

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  • DOI: https://doi.org/10.1007/s10971-008-1821-1

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