Hemaviboon K, Klamtet J. Removal of Methylene Blue Dye from Aqueous Solution by Adsorption on Leonardite Char. Asian Health Sci.Tech.Rep. [internet]. 2020 Feb. 13 [cited 2026 Oct. 11];28(1):82-93. available from: https://ph03.tci-thaijo.org/index.php/ahstr/article/view/1531