Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation
In this work, ternary all-solid-state Z-scheme g-C<sub>3</sub>N<sub>4</sub>/carbon nanotubes/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> (g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO) composites with enhanced photocatalytic ac...
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doaj-302df6faa3bb4205873b7930db3bcd752020-11-24T20:53:35ZengMDPI AGMicromachines2072-666X2018-11-0191261310.3390/mi9120613mi9120613Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye DegradationLijing Di0Hua Yang1Tao Xian2Xiujuan Chen3State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaCollege of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810008, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaIn this work, ternary all-solid-state Z-scheme g-C<sub>3</sub>N<sub>4</sub>/carbon nanotubes/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> (g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO) composites with enhanced photocatalytic activity were prepared by a hydrothermal method. The morphology observation shows that ternary heterojunctions are formed in the g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO composites. The photocatalytic activity of the samples for the degradation of acid orange 7 was investigated under simulated sunlight irradiation. It was found that the ternary composites exhibit remarkable enhanced photocatalytic activity when compared with bare BFO and g-C<sub>3</sub>N<sub>4</sub>/BFO composites. The effect of the CNT content on the photocatalytic performance of the ternary composites was investigated. The photocatalytic mechanism of g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO was proposed according to the photoelectrochemical measurement, photoluminescence, active species trapping experiment and energy-band potential analysis. The results reveal that the introduction of CNT as an excellent solid electron mediator into the ternary composites can effectively accelerate the electron migration between BFO and g-C<sub>3</sub>N<sub>4</sub>. This charge transfer process results in highly-efficient separation of photogenerated charges, thus leading to greatly enhanced photocatalytic activity of g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO composites. Furthermore, the g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO composites also exhibit highly-efficient photo-Fenton-like catalysis property.https://www.mdpi.com/2072-666X/9/12/613Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub>g-C<sub>3</sub>N<sub>4</sub>CNTphotocatalysisZ-scheme heterojunction |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lijing Di Hua Yang Tao Xian Xiujuan Chen |
spellingShingle |
Lijing Di Hua Yang Tao Xian Xiujuan Chen Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation Micromachines Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> g-C<sub>3</sub>N<sub>4</sub> CNT photocatalysis Z-scheme heterojunction |
author_facet |
Lijing Di Hua Yang Tao Xian Xiujuan Chen |
author_sort |
Lijing Di |
title |
Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation |
title_short |
Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation |
title_full |
Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation |
title_fullStr |
Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation |
title_full_unstemmed |
Construction of Z-Scheme g-C<sub>3</sub>N<sub>4</sub>/CNT/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation |
title_sort |
construction of z-scheme g-c<sub>3</sub>n<sub>4</sub>/cnt/bi<sub>2</sub>fe<sub>4</sub>o<sub>9</sub> composites with improved simulated-sunlight photocatalytic activity for the dye degradation |
publisher |
MDPI AG |
series |
Micromachines |
issn |
2072-666X |
publishDate |
2018-11-01 |
description |
In this work, ternary all-solid-state Z-scheme g-C<sub>3</sub>N<sub>4</sub>/carbon nanotubes/Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> (g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO) composites with enhanced photocatalytic activity were prepared by a hydrothermal method. The morphology observation shows that ternary heterojunctions are formed in the g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO composites. The photocatalytic activity of the samples for the degradation of acid orange 7 was investigated under simulated sunlight irradiation. It was found that the ternary composites exhibit remarkable enhanced photocatalytic activity when compared with bare BFO and g-C<sub>3</sub>N<sub>4</sub>/BFO composites. The effect of the CNT content on the photocatalytic performance of the ternary composites was investigated. The photocatalytic mechanism of g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO was proposed according to the photoelectrochemical measurement, photoluminescence, active species trapping experiment and energy-band potential analysis. The results reveal that the introduction of CNT as an excellent solid electron mediator into the ternary composites can effectively accelerate the electron migration between BFO and g-C<sub>3</sub>N<sub>4</sub>. This charge transfer process results in highly-efficient separation of photogenerated charges, thus leading to greatly enhanced photocatalytic activity of g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO composites. Furthermore, the g-C<sub>3</sub>N<sub>4</sub>/CNT/BFO composites also exhibit highly-efficient photo-Fenton-like catalysis property. |
topic |
Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> g-C<sub>3</sub>N<sub>4</sub> CNT photocatalysis Z-scheme heterojunction |
url |
https://www.mdpi.com/2072-666X/9/12/613 |
work_keys_str_mv |
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