▎ 摘　　要

NOVELTY - Method for preparing modified coal gangue adsorbent involves (a) calcining the coal gangue and acidifying, using anhydrous ethanol as a solvent, and the acidified gangue and KH560 undergo a silanization reaction to obtain silanized coal gangue, (b) using water as a solvent, adding graphene oxide, stirring at 5-10℃ to disperse evenly, adding silanized gangue and stirring at 80-90℃ to obtain gangue/graphene oxide, and (c) using phosphate buffer as a solvent, activating arginine, adding gangue/graphene oxide, and stirring at 50-60℃ to obtain modified gangue. USE - The method is used for preparing a modified coal gangue adsorbent in wastewater treatment (all claimed). ADVANTAGE - The modified coal gangue adsorbent prepared by the above-mentioned method effectively improves the treatment effect on cadmium ions in waste water and improves the utilization rate of coal gangue. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an application of the modified coal gangue adsorbent in wastewater treatment.