Characterizations and Its Efficiency on Dye removal of Fly Ash Mixed with Titanium Dioxide Photocatalyst

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Boonyarporn Songkanam
Ampol Wongsa
Vanchai Sata
Kitirote Wantala


The aim of this work was to mix titanium dioxide (TiO2-P25) photocatalyst in contents 0%, 5%, 10% and 15% by weight with coal fly ash from Mae-Moh coal power plant (x%TiO2/FA) mixed by mechanical method for depolluting geo-polymer production. The mixed samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, and UV–vis diffuse reflectance spectroscopy (UV-DRS) and studied the Reactive red 120 (RR120) dye degradation efficiency under UV irradiation. The results were found that the crystallinity of anatase and rutile phases increased with increasing TiO2-P25 contents. The specific surface area and pore size increased as well. In addition, the energy band-gap of mixed samples increased from 2.46 to 3.05 eV with increasing photocatalyst contents. Dye degradation studies were tested at initial RR120 concentration 20 ppm and pH 6. The results were found that at 120 min of reaction time, the percent removal of 0%, 5%, 10% and 15% samples were 28.78%, 51.23%, 72.65% and 82.74%, respectively. However, TiO2-P25 photocatalyst can degrade dye about 99.76%. This research can confirm that the mixed samples between coal fly ash from Mae-Moh coal power plant and TiO2 can be used as raw material to produce depolluting geo-polymer for dye degradation.

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Songkanam, B., Wongsa, A., Sata, V. ., & Wantala, K. (2020). Characterizations and Its Efficiency on Dye removal of Fly Ash Mixed with Titanium Dioxide Photocatalyst. Journal of Engineering, RMUTT, 18(1), 101–110. Retrieved from
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