“Perbandingan Gugus Fungsi Dan Morfologi Permukaan Karbon Aktif Dari Pelepah Kelapa Sawit Menggunakan Aktivator Asam Fosfat (H3PO4) Dan Asam Nitrat (HNO3): Comparison of Functional Groups and Morphologies of Activated Carbon Surfaces from Palm Tree Fronds Using Phosphoric Acid (H3PO4) and Nitric Acid (HNO3) Activators”. Talenta Conference Series: Science and Technology (ST) 1, no. 2 (December 20, 2018): 204–208. Accessed May 1, 2026. https://talentaconfseries.usu.ac.id/index.php/st/article/view/299.