Do, Thuy-Tien, Thi-Huyen Nguyen, The-Duyen Nguyen, and Huu-Tap Van. 2025. “The Ammonium Adsorption Capacity of Coffee husk‑derived Activated Carbon Composite With \(\text{MnFe}_2\text{O}_4\)”. HPU2 Journal of Science: Natural Sciences and Technology 4 (01):39-47. https://doi.org/10.56764/hpu2.jos.2025.4.01.39-47.