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

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

中国物理B ›› 2017, Vol. 26 ›› Issue (5): 58101-058101.doi: 10.1088/1674-1056/26/5/058101

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

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

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)

School of Physics and Electronic Engineering, Mudanjiang Normal University, Mudanjiang 157011, China

收稿日期:2017-01-09 修回日期:2017-01-31 出版日期:2017-05-05 发布日期:2017-05-05
通讯作者: Bing Zhang E-mail:mnuzhangbing@126.com
基金资助:
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).

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

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)

School of Physics and Electronic Engineering, Mudanjiang Normal University, Mudanjiang 157011, China

Received:2017-01-09 Revised:2017-01-31 Online:2017-05-05 Published:2017-05-05
Contact: Bing Zhang E-mail:mnuzhangbing@126.com
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: carbon nanodots, TiO₂, photocatalysis, electron transfer

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.

Key words: carbon nanodots, TiO₂, photocatalysis, electron transfer

中图分类号: (Carbon/carbon-based materials)

81.05.U-

82.65.+r (Surface and interface chemistry; heterogeneous catalysis at surfaces) 78.47.jd (Time resolved luminescence) 78.67.Sc (Nanoaggregates; nanocomposites)

孙明烨, 郑友进, 张蕾, 赵立萍, 张冰. Carbon-nanodot-coverage-dependent photocatalytic performance of carbon nanodot/TiO₂ nanocomposites under visible light[J]. 中国物理B, 2017, 26(5): 58101-058101.

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[J]. Chin. Phys. B, 2017, 26(5): 58101-058101.

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

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

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