▎ 摘　　要

NOVELTY - The preparation of rare earth element doped modified nano-zinc oxide-graphene composite photocatalytic material involves (1) mixing zinc nitrate hexahydrate and urea, adding deionized water, adding lanthanum nitrate and cadmium nitrate, dissolving, adjusting pH, heating and stirring, condensing and refluxing, washing, drying, cooling and grinding to prepare lanthanum and cadmium-doped nano-zinc oxide, (2) dripping solution (B) to solution (A) under magnetic stirring and heating condition, reacting until turbid, cooling, ultrasonically dispersing, transferring to a reactor, reacting in oven, cooling, taking out the liquid, leaving still and layering, pouring the supernatant, washing, drying, grinding, calcining, and cooling to prepare polyethylene glycol and magnesium codoped nano-zinc oxide, and (3) adding graphene oxide dispersion liquid and the material to distilled water, ultrasonically dispersing, stirring, adding hydrazine hydrate, reacting, washing, and drying. USE - Preparation of rare earth element doped modified nano-zinc oxide-graphene composite photocatalytic material. ADVANTAGE - The method enables preparation of rare earth element doped modified nano-zinc oxide-graphene composite photocatalytic material with excellent stability and photocatalytic activity, and which broadens the range of photon absorption of zinc oxide, and facilitates the recovery. DETAILED DESCRIPTION - The preparation method of rare earth element doped modified nano-zinc oxide-graphene composite photocatalytic material involves (1) mixing 6-6.6 pts. wt. zinc nitrate hexahydrate and 3.6-4 pts. wt. urea, adding 100-110 pts. wt. deionized water, adding lanthanum nitrate and cadmium nitrate, fully stirring to dissolve, adjusting pH of the solution to 9, placing in a microwave chemical reactor, microwave heating and magnetically stirring, condensing and refluxing for 30-35 minutes, washing the product with anhydrous ethanol, drying, placing in a resistance furnace at 490-510 degrees C for 115-125 minutes, cooling and grinding to prepare lanthanum and cadmium-doped nano-zinc oxide, (2) dripping solution (B) to solution (A) under magnetic stirring and heating condition, reacting until turbid, placing in a cold water bath, cooling to normal temperature, ultrasonically dispersing for 10-15 minutes, transferring to a reactor, reacting in a oven at 100-103 degrees C for 3-4 hours, cooling to room temperature, taking out the liquid, leaving still and layering, pouring the supernatant, washing the precipitate 2-3 times with distilled water, washing 1-2 times with ethanol, placing in the oven, drying at 100-105 degrees C, grinding with a mortar, placing in a crucible, placing in a muffle furnace, calcining, and cooling to the room temperature to prepare polyethylene glycol and magnesium codoped nano-zinc oxide, and (3) adding graphene oxide dispersion liquid and the material obtained in step (1) and (2) to 200-300 pts. wt. distilled water, ultrasonically dispersing for 30-35 minutes, electrically stirring for 24-25 hours, adding 0.1-0.2 pt. wt. hydrazine hydrate, reacting at 94-96 degrees C for 55-65 minutes, washing with water to neutral, and vacuum drying at 60-63 degrees C.