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Vol. 25 No. 2 (2013): Vol 25 Issue 2

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Photodegradation of Malachite Green by Immobilization of Titanium Dioxide on Glass Plates

https://doi.org/10.14233/ajchem.2013.12867
Pei-Wen Lee
Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia
Siew-Teng Ong
Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia
Yung-Tse Hung
Department of Civil and Environmental Engineering, Cleveland State University, Cleveland, Ohio, U.S.A
Siew-Ling Lee
Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia

Corresponding Author(s) : Siew-Teng Ong

ongst@utar.edu.my; ongst_utar@yahoo.com

Asian Journal of Chemistry, Vol. 25 No. 2 (2013): Vol 25 Issue 2

Abstract

The effects of pH, contact time, initial dye concentration, numbers of dip coating, light sources and repetitive usage of dip-coated TiO2 were studied in batch experiments in order to investigate the photodegradation efficiency of malachite green in aqueous solution by using titanium dioxide, TiO2 immobilized on glass plates. The photodegradation of malachite green was found to be more effective at lower initial dye concentration. Kinetic studies showed good correlation coefficient for a pseudo-first order kinetic model. The removal of malachite green was dependent on the TiO2 loading where the percentage removal of malachite green was 92.15, 94.28 and 98.43 % for 5, 10 and 15 number of TiO2 dip-coating, respectively. Among the three light sources used, sunlight possessed the highest removal efficiency with 100 % of removal of dye in 6 h of irradiation. The degradation of malachite green was enhanced in basic solution compared with acidic solution due to the amphoteric property of TiO2. The decolourization efficiency was found to be decreased after each repetitive usage of dip-coated TiO2 glass plates. However, the immobilized TiO2 still displayed a good performance in the removal of malachite green.

Keywords

Malachite green Photodegradation TiO2 Batch experiments Decolorization effficiency
Lee, P.-W., Ong, S.-T., Hung, Y.-T., & Lee, S.-L. (2012). Photodegradation of Malachite Green by Immobilization of Titanium Dioxide on Glass Plates. Asian Journal of Chemistry, 25(2), 755–758. https://doi.org/10.14233/ajchem.2013.12867
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