| Summary: | The present work aims to examine the mechanism and purification effect of graphene oxide (GO) and GO composite materials for photocatalysis sewage treatment. TiO<sub>2</sub> nanoparticles were prepared using the sol-gel technique; GO was prepared using the modified Hummers technique; and finally, a new N-TiO<sub>2</sub>/GO photocatalysis composite material was prepared by hydrothermal synthesis. As a nitrogen source, urea uses non-metal doping to broaden the photoresponse range of TiO<sub>2</sub>. The prepared GO and its composite materials are characterized. Simulation experiments, using the typical water dye pollutant rhodamine B (RhB), tested and analyzed the adsorption and photocatalysis performances of the prepared GO and its composite materials. Characterization analysis demonstrates that TiO<sub>2</sub> is distributed on the GO surface in the prepared N-TiO<sub>2</sub>/GO material. Simultaneously, nitrogen doping causes TiO<sub>2</sub> on the GO surface to seem uniformly dispersed. X-ray Diffractometer (XRD) spectrums suggest that TiO<sub>2</sub> on the GO surface presents an anatase crystal structure; infrared spectrums display the characteristic vibration peaks of the TiO<sub>2</sub> and GO. Adsorption performance analysis illustrates that N-TiO<sub>2</sub>/GO can provide an adsorption amount of 167.92 mg/g in the same time frame and photocatalysis for visible lights of 57.69%. All data present an excellent linear fitting relationship to the first-order dynamic equation. Therefore, the prepared GO composite materials possess outstanding absorption and photocatalysis performances, providing an experimental basis for sewage treatment and purification using photocatalysis approaches in the future.
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