Hydrogen sulfide (H2S) is a toxic gas commonly released from industrial activities, wastewater treatment, and biogas production, posing serious risks to human health and the environment. This study evaluated the adsorption efficiency of H2S using coconut shell-derived activated carbon (AC) and iron oxide (FO). A series of experiments were conducted on a continuous laboratory scale adsorption column to examine the effects of adsorbent dosage, contact time, gas flow rate, and mixing ratio. The study results revealed a highest H2S adsorption efficiency at the experiment conditions of 1 g material dosage, 60 min adsorption time, 500 mL.min-1 gas flow rate, initial H₂S concentration of 70 ppm, and a mixing ratio of AC:FO = 70:30. The Thomas and Adams-Bohart models were applied to simulate the adsorption process. The Adams-Bohart model indicated that FO had a higher maximum adsorption capacity per unit volume (87.57 mg.L-1 versus 7.55 mg.L-1 for AC), suggesting a stronger initial adsorption ability. Further research on the effectiveness of the absorbents under real conditions are neccessary.