Abstract—The photodecolorization of malachite green (MG) dye was effectively done using Ruthenium-doped TiO
2 photocatalysts under visible light illumination. X-ray diffraction analysis revealed that anatase and rutile peaks were both found in undoped TiO
2 while only anatase peaks were present in Ru-doped TiO
2 systems which were calcined at 500°C. The 0.008 Ru-TiO
2 photocatalysts calcined at 300°C showed broader peaks compared to those calcined at 500°C. Further increase of calcination temperature to 700°C promotes the transformation of anatase to rutile peaks. The photocatalytic activity of TiO
2 was found to increase with the addition of Ruthenium ions, from 20% for undoped TiO
2 to 87% for 0.80 Ru-doped TiO
2. The maximum photocatalytic removal of MG dye was achieved using 1.50 g∙L
-1 of catalyst loading for 0.008 Ru-doped TiO
2. The TiO
2 photocatalysts prepared at a calcination temperature of 500°C showed higher photodecolorization efficiency compared to those calcined at 300°C and 700°C. Kinetic studies revealed that the photodecolorization of MG using Ru-doped TiO
2 followed a first order kinetics.
Index Terms—Photocatalytic, decolorization, malachite green, Titania.
A. A. Chan is with the Department of Chemical Engineering, Faculty of Engineering, University of Santo Tomas, Manila, Philippines (e-mail: aachan@ust.edu.ph).
S. J. Lopez and A. V. Masangkay were with the Department of Chemical Engineering, Faculty of Engineering, University of Santo Tomas, Manila, Philippines.
L. D. Lapitan Jr. is with the Department of Chemical Engineering, Faculty of Engineering, University of Santo Tomas, Manila, Philippines and Research Center for the Natural and Applied Sciences, University of Santo Tomas (e-mail: ldlapitan@ ust.edu.ph).
[PDF]
Cite: Aldrin Lorrenz A. Chan, Sarah Jane C. Lopez, Arvie Victor M. Masangkay, and Lorico DS. Lapitan Jr, "Synthesis and Photocatalytic Activity of Ruthenium-Titania for Enhanced Decolorization of Malachite Green under Visible Light Illumination ," International Journal of Chemical Engineering and Applications vol. 13, no. 1, pp. 1-9, 2022.
