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Open AccessArticle

Enhancement of Photocatalytic Activity under Visible Light Irradiation via the [email protected] Core-Shell Structure

Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China
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Author to whom correspondence should be addressed.
Materials 2019, 12(10), 1679; https://doi.org/10.3390/ma12101679
Received: 15 April 2019 / Revised: 17 May 2019 / Accepted: 20 May 2019 / Published: 23 May 2019
(This article belongs to the Special Issue Catalytic Materials for Sustainable Development)
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Abstract

In this paper, a [email protected] photocatalyst with a core-shell structure was reported. A two-dimensional TCNQ (7,7,8,8-Tetracyanoquinodimethane) nanosheet, with a π-π conjugate structure, was used as a shell layer to realize the flexible coating on the surface of AgI nanoparticles. These special core-shell structure composites solve the key problems of the small interface of the bulk composites and the lesser charge transfer paths, which could accelerate the migration of photogenerated carriers. Thus, the [email protected] photocatalysts showed the better photodegradation performance for the methylene blue (MB) solution, and the degradation rate of [email protected] (1 wt.%) composite was 1.8 times than AgI under irradiation. The reactive species trapping experiments demonstrated that ·O2, h+, and ·OH all participated in the MB degradation process. The photocatalytic mechanism of [email protected] composites could be rationally explained by considering the Z-scheme structure, resulting in a higher redox potential and more efficient separation of charge carriers. At the same time, the unique core-shell structure provides a larger contact area, expands the charge transport channel, and increases the surface active sites, which are beneficial for improving photocatalytic performance. View Full-Text
Keywords: TCNQ; core-shell structure; photocatalytic activity TCNQ; core-shell structure; photocatalytic activity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xie, W.; Liu, L.; Cui, W.; An, W. Enhancement of Photocatalytic Activity under Visible Light Irradiation via the [email protected] Core-Shell Structure. Materials 2019, 12, 1679.

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