▎ 摘　　要

NOVELTY - Preparing nano adsorbent involves adding the polyvinylpyrrolidone (PVP), graphene oxide and secondary water into the container, stirring for 3-30 minutes while adding ammonia water and hydrazine hydrate, where mass ratio of graphene oxide, PVP, ammonia and hydrazine is 1:2.5-3.5:100-200:10-20:6500-8500. The obtained product is reacted at 40-80 degrees C for 2-5 hours and cooled to room temperature. The obtained product is stirred at speed of 11000-13000 revolution per minute for 15-30 minutes to obtain solid and washed with secondary water for two times. USE - Method for preparing nano adsorbent for treating dye waste water (claimed). ADVANTAGE - The method enables to prepare nano adsorbent in cost-effective manner, has high chemical stability, good adsorption and decolorization effect. DETAILED DESCRIPTION - Preparing nano adsorbent involves adding the polyvinylpyrrolidone (PVP), graphene oxide and secondary water into the container, stirring for 3-30 minutes while adding ammonia water and hydrazine hydrate, where mass ratio of graphene oxide, PVP, ammonia and hydrazine is 1:2.5-3.5:100-200:10-20:6500-8500. The obtained product is reacted at 40-80 degrees C for 2-5 hours and cooled to room temperature. The obtained product is stirred at speed of 11000-13000 revolution per minute for 15-30 minutes to obtain solid and washed with secondary water for two times. The secondary water is added to the obtained product to obtain PVP-graphene material suspension.