▎ 摘　　要

NOVELTY - Preparing hydrogel involves dispersing graphene oxide in deionized water and then treating by ultrasonic to obtain mixture. Urea is added into mixture and then heated at 180 degrees C for 12 hours to obtain another mixture. The obtained mixture is soaked in distilled water for 2-3 days and then freeze-dried to obtain the product. USE - Method for preparing hydrogel used for absorbing heavy metal ion in water (claimed). ADVANTAGE - The method enables to prepare hydrogel, that has high heavy metal ion absorbing efficiency.