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Chemical agents and activation atmosphere have a pretty good influence on the formation of activated carbons, surface characteristic, and its adsorption properties. In this experiment, the effect of activating agents (H₃PO₄, ZnCl₂, KOH, and CaO) on Acacia mangium wood under nitrogen and carbon dioxide gas atmosphere were evaluated. The obtained activated carbons were characterized by percent burn-off, field emission scanning electron microscopy (FESEM), energy dispersive x-ray spectroscopy (EDX), image analysis, textural properties, Fourier transform infrared spectroscopy (FTIR), powder x-ray diffraction (XRD), thermogravimetric analysis (TGA), proton adsorption capacity, and pHzpc. The results revealed that the chemical activation increased the yield and oxygen-free atmosphere created by nitrogen gas was more efficient in producing significant surface area, and large pore volume activated carbons …