A　series　of　graphitic　carbon　nitride　(CN)　in　the　form　of　nanosheets　with　porous　structure　have　been　prepared　through　thermal　treatment　of　bulk　CN　in　air.　Compared　with　the　bulk　counterpart,　the　as-generated　holey　CN　nanosheets　are　larger　in　specific　surface　area.　Endowed　with　more　active　sites　and　enhanced　mass　transport　ability,　the　latter　display　catalytic　performance　substantially　superior　to　the　former,　exhibiting　higher　H2S　conversion　and　S　selectivity　in　the　oxidation　of　H2S　to　S.　Moreover,　the　CN　nanosheets　show　much　better　durability　than　traditional　catalysts.　It　is　envisaged　that　the　strategy　is　a　general　technique　that　can　be　extended　to　produce　porous　CN　nanosheets　from　other　nitrogen-rich　precursors,　as　well　as　to　prepare　other　2D　carbon-based　materials　for　potential　applications.　©　2019　American　Chemical　Society.