Enhanced Visible-Light Photocatalytic Activity of Ag QDs Anchored on CeO<sub>2</sub> Nanosheets with a Carbon Coating

Ag quantum dots (QDs) anchored on CeO<sub>2</sub> nanosheets with a carbon coating (Ag/CeO<sub>2</sub>@C) (composites) were prepared via an in situ reduction approach for the photocatalytic degradation of Cr(VI) and tetracycline hydrochloride (TCH) in the visible-light region...

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Bibliographic Details
Main Authors: Xiaogang Zheng, Qian Chen, Sihao Lv, Xiaojin Fu, Jing Wen, Xinhui Liu
Format: Article
Language:English
Published: MDPI AG 2019-11-01
Series:Nanomaterials
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Online Access:https://www.mdpi.com/2079-4991/9/11/1643
Description
Summary:Ag quantum dots (QDs) anchored on CeO<sub>2</sub> nanosheets with a carbon coating (Ag/CeO<sub>2</sub>@C) (composites) were prepared via an in situ reduction approach for the photocatalytic degradation of Cr(VI) and tetracycline hydrochloride (TCH) in the visible-light region. The photocatalytic activity of Ag/CeO<sub>2</sub>@C was greatly affected by carbon content, Ag-doping content, Cr(VI) concentration, pH value, and inorganic ions. Enhanced photocatalytic activity was obtained by Ag/CeO<sub>2</sub>@C (compared to CeO<sub>2</sub> and CeO<sub>2</sub>@C), of which 3-Ag/CeO<sub>2</sub>@C-2 with an Ag-doping content of 5.41% presented the best removal efficiency and the most superior stability after five cycles. <b>&#183;</b>O<sub>2</sub><sup>&#8722;</sup> and <b>&#183;</b>OH radicals were crucial for the photocatalytic capacity of 3-Ag/CeO<sub>2</sub>@C-2. The combined effect of the surface plasma resonance (SPR) of Ag QDs, an electron trapper of carbon shells, and the redox activity of the Ce(III)/Ce(IV) coupling induced efficient charge transfer and separation, suppressing the recombination of electron&#8722;hole pairs.
ISSN:2079-4991