▎ 摘　　要

NOVELTY - Preparing graphene/iridium oxyhydroxide/graphene sandwich structure photocatalyst involves diluting aqueous graphene oxide solution with absolute ethanol, then adding nafion solution, forming uniform solution by ultrasonication, and applying uniform solution to conductive glass, drying at 20-30 degrees C for 1-2 hours, placing in tube furnace and calcining under argon atmosphere to obtain graphene-loaded conductive glass, adding cesium iodide to anhydrous ethanol, and adding hydriodic acid under stirring until cesium iodide is completely dissolve to obtain cesium iodide solution, and then dropping cesium iodide solution on load. The conductive glass of graphene is then dried at 20-30 degrees C for 1-2 hours, and then placed in dry box for heat treatment to obtain conductive glass supporting graphene and cesium iodide. USE - Method for preparing graphene/iridium oxyhydroxide/graphene sandwich structure photocatalyst for dye wastewater treatment (claimed). ADVANTAGE - The method enables to prepare graphene/iridium oxyhydroxide/graphene sandwich structure photocatalyst that is convenient to recycle, has simple preparation process, low cost, good catalytic efficiency and enlarges light response range. DETAILED DESCRIPTION - Preparing graphene/iridium oxyhydroxide/graphene sandwich structure photocatalyst involves diluting aqueous graphene oxide solution with absolute ethanol, then adding nafion solution, forming uniform solution by ultrasonication, and applying uniform solution to conductive glass, drying at 20-30 degrees C for 1-2 hours, placing in tube furnace and calcining under argon atmosphere to obtain graphene-loaded conductive glass, adding cesium iodide to anhydrous ethanol, and adding hydriodic acid under stirring until cesium iodide is completely dissolve to obtain cesium iodide solution, and then dropping cesium iodide solution on load. The conductive glass of graphene is then dried at 20-30 degrees C for 1-2 hours, and then placed in dry box for heat treatment to obtain conductive glass supporting graphene and cesium iodide, immersed conductive glass loaded with graphene and cesium iodide in aqueous solution of graphene oxide, followed by dry at 40-60 degrees C for 50-80 minutes to obtain graphene/iodine cerium oxide/graphene composite photocatalyst.