碳量子点修饰石墨相氮化碳光催化降解罗丹明B的研究

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Abstract In this study, CQDs/g-C₃N₄ was prepared by using ascorbic acid and urea as precursors. The characterizations of CQDs/g-C₃N₄ were carried out by X-ray diffraction (XRD), ultraviolet visible light diffuse reflection (UV-vis), transmission electron microscopy (TEM), fluorescence spectrum (PL), X-ray photoelectron spectroscopy (XPS). The results showed that carbon quantum dots were well loaded onto the surface of graphite phase carbon nitride bringring about the active sites of g-C₃N₄ increase. The CQDs modification could effectively improve the visible light absorbance of g-C₃N₄, as well as decrease its band gap. At the same time, the addition of carbon quantum dots could inhibit the recombination of photogenerated electron-hole pair in catalyst. Under simulated light irradiation, the RhB photodegradation ability of CQDs/g-C₃N₄ was significantly higher than that of single g-C₃N₄. 56.7% of RhB could be degraded over 0.01g of CQDs/g-C₃N₄ at 80℃ in 3h. Capture agent experiment result showed that superoxide radical played a major role in the photodegradation reaction system.

Key words： carbon quantum dots photogenic electron hole pair superoxide radical

Received: 04 December 2019

PACS:

X703.1

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	Articles by authors
	LIU Shuai
	LI Xue-lei
	WANG Shuo-tian
	WANG Yan-juan
	YUAN Xing-zhou
	ZHANG Jian
	LIANG Fei-xue
	HU Shao-zheng

Cite this article:

LIU Shuai,LI Xue-lei,WANG Shuo-tian等. Photocatalytic degradation of rhodamine B by carbon quantum dot modified graphite phase carbon nitride[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2909-2916.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/2909

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