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采用高温热剥离和溶剂热过程分别还原氧化石墨和氧化石墨制备出石墨烯,进一步使用所合成的石墨烯与P25通过一步水热过程合成出石墨烯/P25复合材料。样品的光催化活性通过可见光下降解罗丹明B进行评测,其中P25和热剥离还原得到的石墨烯复合比P25和溶剂热还原的石墨烯复合显示出更优异的光催化活性,这是由于热剥离还原的石墨烯具有更高的还原度和更强的电子—空穴分离效率所致。进一步在不同温度下通过热剥离法制备了还原石墨烯,探讨的石墨烯/P25复合材料的光催化活性。较高的剥离温度有利于石墨烯还原程度的改善,导致光催化活性的提高。
The graphene was prepared by reduction of graphite oxide and graphite oxide respectively by high temperature thermal stripping and solvothermal process, and the graphene / P25 composite was further synthesized by one step hydrothermal process using the synthesized graphene. The photocatalytic activity of the sample was evaluated by visible light degradation of rhodamine B, in which P25 and graphene composite ratio P25 obtained by thermal stripping reduction showed better photocatalytic activity than solvothermally reduced graphene due to thermal stripping The reduced graphene has higher reducibility and stronger electron-hole separation efficiency. The graphene was further reduced by thermal stripping at different temperatures to investigate the photocatalytic activity of graphene / P25 composites. The higher exfoliation temperature is conducive to the improvement of graphene reduction, resulting in the increase of photocatalytic activity.