▎ 摘　　要

NOVELTY - Preparation of modified porous magnetic xanthan gum/graphene composite microspheres involves adding 74-80 wt.% sunflower oil, 10-16 wt.% dimethylamine propylamine and 8-12 wt.% glyceryl tristearate into reactor, and stirring to obtain organic phase; and adding and dissolving 64-70 wt.% ethanol, 15-20 wt.% 3-mercaptopropyltriethoxysilane, 12-18 wt.% porous magnetic xanthan gum/graphene composite microspheres into reactor, heating at 60 plus minus 2 degrees C, stirring, reflux reacting for 6 hours, solid-liquid separating and drying to obtain 150-200 mu m particle sized product. USE - Method for preparing modified porous magnetic xanthan gum/graphene composite microspheres. ADVANTAGE - The method is environment-friendly, has high adsorption capacity, low cost and easy magnetic separation, and can be used repeatedly. DETAILED DESCRIPTION - Preparation of modified porous magnetic xanthan gum/graphene composite microspheres comprises adding 74-80 wt.% sunflower oil, 10-16 wt.% dimethylamine propylamine and 8-12 wt.% glyceryl tristearate into reactor, and stirring to obtain organic phase; adding 68-76 wt.% deionized water, 10-16 wt.% xanthan gum, 4-8 wt.% graphene, 2-5 wt.% magnetic iron oxide nanoparticles and 5-10 wt.% triethanolamine into reactor, and ultrasonically dispersing to obtain aqueous phase; spraying obtained aqueous phase into reactor at room temperature, stirring under 3000 revolutions/minute (rpm), mixing organic phase and water at vol ratio of 1:0.9-1.1, stirring, reacting for 1 hour, heating at 65 plus minus 2 degrees C for 30 minutes, cooling at room temperature, solid-liquid separating, adding solid phase with deionized water, soaking for 24 hours, placing into plastic container, freezing at - 18 degrees C for 4 hours, placing into freeze-drying box and freeze drying for 24 hours to obtain porous magnetic xanthan gum/graphene composite microspheres; and adding and dissolving 64-70 wt.% ethanol, 15-20 wt.% 3-mercaptopropyltriethoxysilane, 12-18 wt.% porous magnetic xanthan gum/graphene composite microspheres into reactor, heating at 60 plus minus 2 degrees C, stirring, reflux reacting for 6 hours, cooling, washing with deionized water and ethanol, solid-liquid separating and drying to obtain 150-200 mu m particle sized product.