Separation and purification of CO from industrial tail gas is an important way to achieve resource recycling, with important economic and social benefits. The adsorption separation of CO technology has the advantages of simple process, high degree of automation, convenient operation, and low energy consumption. Cu(I) based adsorbents are commonly used as CO adsorbents due to the π complexation interaction with CO molecules, however, they are prone to oxidative deactivation. In this study, the reductive metal salts were loaded onto the Cu(I) based adsorbents in order to further improve their antioxidant capacity. A series of reduced metal salt doped Cu(I) based adsorbents were prepared using CuCl₂ as precursor, activated carbon as reducing agent and reduced metal salts as antioxidants and the prepared adsorbents were characterized by SEM, XRD and N₂ adsorption/desorption tests. The results show that the reduced metal salt FeCl₂ doped Cu(I) based adsorbent exhibits a better antioxidant performance, and the adsorption of CO remains 55% of the original amount after placing it in the atmosphere for 12 h. Moreover, the adsorbent shows high CO adsorption capacity and adsorption selectivity as well as good cycling stability.