Sembiring, J. B., Sylvia, D., & Pohan, M. S. A. (2026). Development of a Peanut Shell-Derived Chitosan–Activated Carbon Composite as a Sustainable Adsorbent for Permanganate (MnO₄⁻) Removal from Aqueous Solution. Hydrogen: Jurnal Kependidikan Kimia, 14(4). https://doi.org/10.33394/hjkk.v14i4.21354