A　new　type　of　base　catalyst　was　designed　and　prepared　by　metalation　of　carbon　nitrides　with　alkali　metal　ions.　The　as-prepared　metalated　carbon　nitride　composites　showed　enhanced　basicity　and　efficient　catalytic　hydrolysis　of　carbonyl　sulfide.　The　results　of　this　study　demonstrate　that　the　metalation　of　carbon　nitrides　holds　great　promise　for　base　catalysis　applications.