Kosaiyakanon, Chatsuda, and Suratsawadee Kungsanant. 2019. “Adsorption of Reactive Dyes from Wastewater Using Cationic Surfactant-Modified Coffee Husk Biochar: DOI: 10.32526/Ennrj.18.1.2020.03”. Environment and Natural Resources Journal 18 (1), Page: 21-32. https://ph02.tci-thaijo.org/index.php/ennrj/article/view/207229.