▎ 摘　　要

NOVELTY - Composite dye adsorbent comprises graphene oxide and hollow porous spherical hydroxyapatite, where graphene oxide is supported on hollow porous spherical hydroxyapatite. USE - Composite dye adsorbent. ADVANTAGE - The composite dye adsorbent is very fast and efficient removal rate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a composite dye adsorbent, which involves: (A) preparing 0.1-0.3 molar calcium chloride and 0.1-0.3 molar sodium carbonate solution; (B) pouring the prepared calcium chloride solution into solution of 8-12 milligram per milliliter sodium polystyrene sulfonate, where volume ratio of the calcium chloride solution and sodium polystyrene sulfonate solution is 20-40:300; (C) adding sodium carbonate solution dropwise to the above solution in molar ratio of sodium carbonate and calcium chloride is 1-2:1-2, and stirring at room temperature for 0.5-2 hours, centrifuging and drying to obtain calcium-carbonate in white powder; (D) dissolving calcium-carbonate and sodium phosphate in deionized water to obtain mixed solution, where molar ratio of calcium element and phosphorus element is 1.67; (E) weighing and dissolving graphene oxide in the above solution, and adding graphene oxide in an amount of 5-20 wt.% solution, and then adjusting pH to 11, and placing at 100-140 degrees C; and (F) carrying out autoclave reaction for 0.5-2 hours, and drying by centrifugation to obtain graphene oxide/hollow porous spherical hydroxyapatite composite material.