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%。
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.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2015年第6期545-549,共5页
New Carbon Materials
基金
国家自然科学基金(51172152
51242007
51572184)~~
关键词
N掺杂石墨烯量子点
荧光特性
光催化降解
微观结构
Nitrogen doped graphene quantum dots（N-GQDs）
Fluorescent property
Photocatalytic degradation
Microstructure
