Preparation of Ag<sub>2</sub>CO<sub>3</sub>/Ag/g-C<sub>3</sub>N<sub>4</sub> Z-scheme Heterostructure and Photocatalytic Degradation of Rhodamine B Under Visible Light

Preparation of Ag<sub>2</sub>CO<sub>3</sub>/Ag/g-C<sub>3</sub>N<sub>4</sub> Z-scheme Heterostructure and Photocatalytic Degradation of Rhodamine B Under Visible Light

The highly efficient Z-scheme photocatalyst Ag<sub>2</sub>CO<sub>3</sub>/Ag/g-C<sub>3</sub>N<sub>4</sub> with Ag nanoparticles, as an electron mediator, was fabricated by a simple calcinations-precipitation reaction. Photocatalytic experiments of the a...

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Bibliographic Details
Main Authors: WANG Juan, WANG Guo-hong, SUN Ling-ling
Format: Article
Language:zho
Published: Journal of Materials Engineering 2018-09-01
Series:Cailiao gongcheng
Subjects:
Ag<sub>2</sub>CO<sub>3</sub>/Ag/g-C<sub>3</sub>N<sub>4</sub>
Z-scheme photocatalyst
visible light
photocatalytic activity
Online Access:http://jme.biam.ac.cn/CN/Y2018/V46/I9/39
Description
Summary:The highly efficient Z-scheme photocatalyst Ag<sub>2</sub>CO<sub>3</sub>/Ag/g-C<sub>3</sub>N<sub>4</sub> with Ag nanoparticles, as an electron mediator, was fabricated by a simple calcinations-precipitation reaction. Photocatalytic experiments of the as-prepared samples were tested by the photocatalytic oxidation degradation of RhB aqueous solution. The results show that Ag<sub>2</sub>CO<sub>3</sub>/Ag/g-C<sub>3</sub>N<sub>4</sub> composites exhibit enhanced photocatalytic activity, compared with Ag<sub>2</sub>CO<sub>3</sub> and g-C<sub>3</sub>N<sub>4</sub>. The composites exhibit the highest photocatalytic performance, when the mass ratio of g-C<sub>3</sub>N<sub>4</sub> to Ag<sub>2</sub>CO<sub>3</sub>/Ag is 20%,which is attributed to the formation of Z-scheme heterojunction structure between Ag<sub>2</sub>CO<sub>3</sub> and g-C<sub>3</sub>N<sub>4</sub>, thus accelerating electron transfer rate and separating efficiently the photo-generated electron-hole pairs. Meanwhile, the Z-scheme heterojunction structures extend the wavelength range of visible light absorption (from 450nm to 670nm) due to the surface plasma resonance (SPR) of Ag nanoparticles. The trapping experiment results confirm that&#183;O<sub>2</sub><sup>-</sup> and h<sup>+</sup> are main active species,&#183;OH plays a relatively minor role in the decomposition of RhB. A possible mechanism for enhanced photocatalytic activity of Ag<sub>2</sub>CO<sub>3</sub>/Ag/g-C<sub>3</sub>N<sub>4</sub> heterojunction photocatalyst is proposed.
ISSN:1001-4381
1001-4381

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