▎ 摘　　要

NOVELTY - The preparation method of graphene-carbon nanotube composite adsorbent involves: (1) weighing 2 mg/ml graphene oxide solution and ultrasonically stripping to obtain graphene oxide; (2) adding certain amount of ascorbic acid to above solution and carrying out ultrasonic treatment for certain period of time; (3) mixing carbon nanotubes with 10 ml deionized water and resulting solution obtained in step (2), carrying out ultrasonic treatment for 2 hours and again carrying out ultrasonic treatment 0.5-1 hour; and (4) transferring the resulting mixture obtained in step (3) to beaker. USE - The method is useful for preparing graphene-carbon nanotube composite adsorbent, which is useful for removing aqueous solution of tetracycline. ADVANTAGE - The method enables simple and economical preparation of graphene-carbon nanotube composite adsorbent with high yield. DETAILED DESCRIPTION - The preparation method of graphene-carbon nanotube composite adsorbent involves: (1) weighing 2 mg/ml graphene oxide solution and ultrasonically stripping to obtain graphene oxide; (2) adding certain amount of ascorbic acid to above solution and carrying out ultrasonic treatment for certain period of time; (3) mixing carbon nanotubes with 10 ml deionized water and resulting solution obtained in step (2), carrying out ultrasonic treatment for 2 hours and again carrying out ultrasonic treatment for 0.5-1 hour; and (4) transferring the resulting mixture obtained in step (3) to beaker, carrying out reaction under water bath at 80 degrees C for 10-14 hours, then immersing resulting material in deionized water to obtain graphene-carbon nanotubes composite hydrogel and carrying out freeze-drying.