Carbon-nanodot-coverage-dependent photocatalytic performance of carbon nanodot/TiO2 nanocomposites under visible light

doi:10.1088/1674-1056/26/5/058101

Abstract Carbon nanodots (CDs) with visible absorption band and TiO₂ are integrated to enhance the photosensitivity of TiO₂. The CD/TiO₂ nanocomposites show obvious CD-coverage-dependent photocatalytic performance. The CD/TiO₂ nanocomposites with moderate CD coverge exhibit the highest photocatalytic activity after being irradiated with visible light, which is more excellent than that of TiO₂. Too little CD coverage could result in poor visible light absorption, which limits the photocatalytic performance of CD/TiO₂ nanocomposites. While, too much CD coverage weakens the photocatalytic activity of CD/TiO₂ nanocomposites by restraining the extraction of conduction band electrons within TiO₂ to generate active oxygen radicals and the electron transfer (ET) process from CDs to TiO₂. These results indicate that rational regulation of CD coverage and the realization of efficient ET process are important means to optimize the photocatalytic performance of CD/TiO₂ nanocomposites.

Keywords: carbon nanodots TiO₂ photocatalysis electron transfer

Received: 09 January 2017
Revised: 31 January 2017
Accepted manuscript online:

PACS:	81.05.U-	(Carbon/carbon-based materials)
	82.65.+r	(Surface and interface chemistry; heterogeneous catalysis at surfaces)
	78.47.jd	(Time resolved luminescence)
	78.67.Sc	(Nanoaggregates; nanocomposites)

Fund: Project supported by the Scientific Research Starting Fund for Doctor of Mudanjiang Normal University, China (Grant No. MNUB201508), the Youth Science Foundation of Heilongjiang Province, China (Grant No. QC2016007), and the National Natural Science Foundation of China (Grant No. 61604065).

Corresponding Authors: Bing Zhang
E-mail: mnuzhangbing@126.com

Cite this article:

Ming-Ye Sun(孙明烨), You-Jin Zheng(郑友进), Lei Zhang(张蕾), Li-Ping Zhao(赵立萍), Bing Zhang(张冰) Carbon-nanodot-coverage-dependent photocatalytic performance of carbon nanodot/TiO₂ nanocomposites under visible light 2017 Chin. Phys. B 26 058101

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Carbon-nanodot-coverage-dependent photocatalytic performance of carbon nanodot/TiO2 nanocomposites under visible light

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Carbon-nanodot-coverage-dependent photocatalytic performance of carbon nanodot/TiO₂ nanocomposites under visible light