C. Kosaiyakanon and S. Kungsanant, “Adsorption of Reactive Dyes from Wastewater Using Cationic Surfactant-modified Coffee Husk Biochar: DOI: 10.32526/ennrj.18.1.2020.03”, Environ. Nat. Resour. J., vol. 18, no. 1, pp. 21–32, Jul. 2019.