石墨烯还原度对P25/石墨烯复合材料光催化活性的影响

王剑; 王猛; 熊吉如; 陆春华

doi:10.1016/S1872-5805(15)60195-0

石墨烯还原度对P25/石墨烯复合材料光催化活性的影响

doi: 10.1016/S1872-5805(15)60195-0

王剑^1,2,
王猛²,
熊吉如²,
陆春华^1,

1.
南京工业大学材料化学工程国家重点实验室, 材料科学与工程学院, 江苏南京 210009;
2.
南京倍立达新材料系统工程股份有限公司, 江苏南京 211100

基金项目: 中国博士后基金(2014M551577).

详细信息

作者简介:
王剑,博士.E-mail:wangjian@sxicc.ac.cn

通讯作者:
陆春华.E-mail:chhlu@njtech.edu.cn

中图分类号: TB332
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- 文章访问数: 561
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- 被引次数: 0
出版历程
- 收稿日期: 2015-03-16
- 录用日期: 2015-09-07
- 修回日期: 2015-08-10
- 刊出日期: 2015-08-28

Enhanced photocatalytic activity of a TiO₂/graphene composite by improving the reduction degree of graphene

1.
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;
2.
Nanjing Beilida New Materials System Engineering CO. Ltd., Nanjing 211100, China

Funds: China Postdoctoral Science Foundation(2014M551577).

摘要

摘要: 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。
- 光催化 /
- 降解 /
- P25 /
- 热剥离 /
- 石墨烯还原度
Abstract: Two kinds of graphene prepared by a high-temperature exfoliation and a solvothermal method were used as supports of a TiO₂ catalyst (P25) from Degussa, Inc to prepare TiO₂/graphene composites. The photocatalytic activities of the composites were evaluated by their degradation of Rhodamine B in aqueous solutions under visible light. Results indicate that the composites prepared by high-temperature exfoliation have much higher photocatalytic activities than those produced by the solvothermal method or the unsupported P25. Both the adsorption capacity of Rhodamine B on the composites and their light absorption characteristics are independent of the kind of graphene used. The activity increases with exfoliation temperature and reduction degree of the graphene regardless of the methods and conditions used, indicating that a high degree of reduction of graphene can inhibit the recombination of electron-hole pairs generated by light irradiation by increasing electron transfer from TiO₂ to the graphene layer.
- Photocatalytic /
- Degradation /
- P25 /
- Thermal exfoliation /
- Graphene reductive degree

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