▎ 摘　　要

NOVELTY - Magnetic hydroxyapatite/graphene oxide adsorbent is prepared by uniformly mixing calcium nitrate and ammonium bicarbonate, adding magnetic ferroferric oxide, uniformly dispersing by ultrasonicating, slowly adding ammonium hydrogen phosphate, maintaining pH at 10 using ammonia, reacting in water bath, aging to obtain aging system, mixing graphene oxide and water, ultrasonicating to obtain uniform dispersion, adding to aging system, mechanically stirring, cooling to room temperature, vacuum drying, and grinding into powder. USE - Preparation of magnetic hydroxyapatite/graphene oxide adsorbent for removal of heavy metal ions (claimed) in industrial water. ADVANTAGE - Process is simple and has high yield and low energy consumption. Adsorbent has high heavy metal ion removal rate, and excellent physical, chemical, and mechanical properties. DETAILED DESCRIPTION - Magnetic hydroxyapatite/graphene oxide adsorbent is prepared by uniformly mixing 250-350 ml 0.025 mol/L calcium nitrate and 30-50 ml 0.3 mol/L ammonium bicarbonate, adding 0.1-0.2 g magnetic ferroferric oxide, uniformly dispersing by ultrasonicating for 5 minutes, slowly adding 150-200 ml 0.2-0.4 mol/L ammonium hydrogen phosphate, maintaining pH at 10 using ammonia, reacting in water bath at 45 degrees C for 40 minutes, aging for 24 hours to obtain aging system, mixing 0.1-0.2 g graphene oxide and 20 ml water, ultrasonicating for 20-30 minutes to obtain uniform dispersion, adding to aging system, mechanically stirring at 45 degrees C for 4-6 hours, cooling to room temperature, vacuum drying at 50 degrees C, and grinding into powder. An INDEPENDENT CLAIM is included for removal of heavy metal ions which involves mixing 20-60 ml 40-120 mg/L heavy metal ion solution at pH 2-7 and 10-30 mg magnetic hydroxyapatite/graphene oxide, shaking in water bath at 25-45 degrees C for 1-3 hours, removing mixture, magnetically separating, detecting remaining heavy metal ion concentration, and calculating removal rate of heavy metal ions based on initial and remaining heavy metal ions in solution.