Mg-Al layered double hydroxides (Mg-Al LDHs) were used as an adsorbent for hydrogen sulfide (H2S) removal. Removal efficiency of H2S by the Mg-Al LDH has been investigated at different temperatures and humidity. The results have shown Mg-Al LDH to be highly promising as an adsorbent for H2S removal. Research results about sorption mechanisms indicate that at lower temperatures (20oC), H2S removal by Mg-Al LDHs is mainly a physical sorption process; however, at higher temperature (>40oC), it is dominated by chemical reactions involving ion exchange. Confirmation of the redox reaction between H2S and Mg-Al LDHs was provided by XPS data. The results obtained demonstrate that the H2S removal efficiency of Mg-Al LDHs increases with the temperature increasing, and decreases with the water vapour content increasing.