▎ 摘　　要

Waste toner powder is considered not only a recyclable resource but also a hazardous material, because it has a unique microstructure and complex compositions, so it should be properly and effectively disposed of. Herein, we selected waste toner powder as a precursor to synthesize a three-dimensional (3D) porous graphene oxide (GO) hydrogel by a one-pot transformation based on the improved Hummers' method. A series of detection equipment such as a scanning electron microscope and a Raman spectrometer can be employed to probe the microstructure and formation mechanism of the 3D GO hydrogel. Our experimental results show that a 3D porous GO hydrogel with its excellent microstructure can be prepared by using waste toner powder as the precursor. It provides an effective way to dispose of waste toner powder for functional applications.