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Photoelectrochemical degradation of methyl orange using TiO2/Ti films prepared via sol-gel technique

Journal Article


Abstract


  • TiO2 thin films have been prepared using the sol-gel method. The chemically modified sol-gel precursor solution was obtained by the addition of polyethylene glycol and diethanolamine to the titanium alkoxide precursor. Hydrolysis and polycondensation reactions of the precursors in the presence of water were controlled. Electrochemical assisted photocatalytic degradation system has been investigated on a model pollutant, methyl orange dye. Properties of the films were determined as a function of calcination temperatures by surface morphology, X-ray diffraction and photoelectrochemical studies. The photoelectrochemical degradation rate is almost linearly increased with an increased in applied bias potential. The improved in percentage of degradation for about 30% for every increases of 0.5 V was observed for potential range between 0 V and 1.0 V. However, direct electrochemical oxidation of dye begins to occur at potential of 1.5 V and above due to dark current as indicated from current-potential curve behaviour. Introduction of more concentrated dye leads to a decrease in the photodegradation percentage but the rate of photoelectrochemical degradation was almost the same. Larger photocatalyst coated area gives higher degradation rate but showed less charge density.

Publication Date


  • 2007

Citation


  • Zainal, Z., Lee, C. Y., Kassim, A., Hussein, M. Z., & Yusof, N. A. (2007). Photoelectrochemical degradation of methyl orange using TiO2/Ti films prepared via sol-gel technique. Acta Chimica Slovenica, 54(1), 166-174.

Scopus Eid


  • 2-s2.0-34247486183

Start Page


  • 166

End Page


  • 174

Volume


  • 54

Issue


  • 1

Abstract


  • TiO2 thin films have been prepared using the sol-gel method. The chemically modified sol-gel precursor solution was obtained by the addition of polyethylene glycol and diethanolamine to the titanium alkoxide precursor. Hydrolysis and polycondensation reactions of the precursors in the presence of water were controlled. Electrochemical assisted photocatalytic degradation system has been investigated on a model pollutant, methyl orange dye. Properties of the films were determined as a function of calcination temperatures by surface morphology, X-ray diffraction and photoelectrochemical studies. The photoelectrochemical degradation rate is almost linearly increased with an increased in applied bias potential. The improved in percentage of degradation for about 30% for every increases of 0.5 V was observed for potential range between 0 V and 1.0 V. However, direct electrochemical oxidation of dye begins to occur at potential of 1.5 V and above due to dark current as indicated from current-potential curve behaviour. Introduction of more concentrated dye leads to a decrease in the photodegradation percentage but the rate of photoelectrochemical degradation was almost the same. Larger photocatalyst coated area gives higher degradation rate but showed less charge density.

Publication Date


  • 2007

Citation


  • Zainal, Z., Lee, C. Y., Kassim, A., Hussein, M. Z., & Yusof, N. A. (2007). Photoelectrochemical degradation of methyl orange using TiO2/Ti films prepared via sol-gel technique. Acta Chimica Slovenica, 54(1), 166-174.

Scopus Eid


  • 2-s2.0-34247486183

Start Page


  • 166

End Page


  • 174

Volume


  • 54

Issue


  • 1