N掺杂石墨烯量子点的制备及其光催化降解性能

李冬辉; 樊洁心; 王晓敏

N掺杂石墨烯量子点的制备及其光催化降解性能

太原理工大学材料科学与工程学院, 山西太原 030024

基金项目: 国家自然科学基金(51172152,51242007,51572184).

详细信息

作者简介:
李冬辉,硕士研究生.E-mail:15735160971@163.com

通讯作者:
王晓敏,教授.E-mail:wangxiaomin@tyut.edu.cn

中图分类号: TQ127.1⁺1
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- 被引次数: 0
出版历程
- 收稿日期: 2015-11-03
- 录用日期: 2016-01-05
- 修回日期: 2015-12-10
- 刊出日期: 2015-12-28

Preparation of N-doped graphene quantum dots and their photocatalytic degradation activity for methylene blue

College of Materical Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Funds: National Natural Science Foundation of China (51172152, 51242007, 51572184).

摘要

摘要: 石墨烯量子点(GQDs)作为绿色、经济的新型碳质纳米材料在有机污染物的降解、能源利用方面有着广泛的应用前景。以柠檬酸为碳源,尿素作为氮源,通过水热法制备出尺寸均匀、高荧光的N掺杂石墨烯量子点(N-GQDs)。通过X射线衍射、拉曼光谱、透射电子显微镜、荧光光谱、紫外可见吸收光谱等手段对N-GQDs的晶型结构、微观形貌、表面官能团分布和光物理性能进行表征。通过MTT法对N-GQDs的毒性进行检测,又通过对亚甲基蓝(MB)的光催化降解考察样品的光催化性能。结果表明,制备的N-GQDs尺寸均匀、荧光强度高且毒性低。由于N原子的成功掺杂,N-GQDs作为光催化剂在可见光下对MB进行光催化降解比MB的自身降解更快,在短时间内(120 min)降解率可以达到82.5%。
- N掺杂石墨烯量子点 /
- 荧光特性 /
- 光催化降解 /
- 微观结构
Abstract: Nitrogen-doped graphene quantum dots (N-GQDs) were synthesized by the hydrothermal method, using citric acid and urea as the carbon and nitrogen sources, respectively. X-ray diffraction, Raman spectroscopy, transmission electron microscopy, fluorescence spectroscopy and UV-visible absorption spectroscopy were used to characterize their microstructure and photophysical properties. The cytotoxicity of the N-GQDs was tested using 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide. The photocatalytic degradation activity for methylene blue (MB) was investigated under visible light. Results show that the N-GQDs have a narrow size distribution, a high fluorescence and a low cytotoxicity. Photocatalytic degradation rate of the N-GQDs for MB reaches 82.5% under visible light irradiation for 120 min.
- Nitrogen doped graphene quantum dots(N-GQDs) /
- Fluorescent property /
- Photocatalytic degradation /
- Microstructure

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