ZEFFITNI, DAUD K WALANDA, NURHIKMAH, MERY NAPITUPULU, RYKA MARINA W. Preparation of Biochar from Peanut Shells (Arachis Hypogaea L.) For Adsorption of Cadmium (II) Ion . International Journal of Advanced Science and Technology, v. 29, n. 05, p. 10928-10940, 6 Jun. 2020.