Songkanam, Boonyarporn, Ampol Wongsa, Vanchai Sata, and Kitirote Wantala. 2020. “Characterizations and Its Efficiency on Dye Removal of Fly Ash Mixed With Titanium Dioxide Photocatalyst”. Journal of Engineering, RMUTT 18 (1):101-10. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/241889.