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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. st 2018, 1 (2), 204-208. https://doi.org/10.32734/st.v1i2.299.