D. . Andrio, M. R. Saputra, and L. Darmayanti, “Utilization of Magnetic Biochar from Palm Shell as An Adsorbent for Removal of COD, Total Suspended Solid, Oil and Grease in Greywater”, jppipa, pendidikan ipa, fisika, biologi, kimia, vol. 10, no. 3, pp. 1195–1204, Mar. 2024.