“Removal of Methylene Blue by Adsorption onto Activated Carbon From Coconut Shell (Cocous Nucifera L.)”, Indones. j. sci. technol., vol. 4, no. 2, pp. 229–240, Sep. 2019, Accessed: Jun. 07, 2026. [Online]. Available: https://ijost.upi.edu/index.php/ijost/article/view/214