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Construction of g-C 3 N 4 /Ag/TiO 2 Z-scheme photocatalyst and Its improved photocatalytic U(VI) reduction application in water
The reduction of soluble U(VI) to insoluble U(IV) by photocatalytic technology is considered to be a valid method to remove U(VI) from water. Herein, g-C N /Ag/TiO Z-scheme heterojunction was synthesized for photocatalytic U(VI) reduction application. The SEM, XRD and XPS characterization results sh...
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Published in: | Water science and technology 2022-05, Vol.85 (9), p.2639 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | The reduction of soluble U(VI) to insoluble U(IV) by photocatalytic technology is considered to be a valid method to remove U(VI) from water. Herein, g-C
N
/Ag/TiO
Z-scheme heterojunction was synthesized for photocatalytic U(VI) reduction application. The SEM, XRD and XPS characterization results showed that a ternary g-C
N
/Ag/TiO
composite photocatalyst was synthesized successfully. g-C
N
Ag/TiO
exhibited excellent photocatalytic reduction performance for U(VI) under visible light irradiation. After 30 min irradiation, the removal rate of U(VI) was above 99%. XPS indicated that the majority of U(VI) on the surface of g-C
N
/Ag/TiO
was reduced to U(IV). In addition, the photocatalytic activity of g-C
N
/Ag/TiO
has been kept significantly after five rounds of experiments, indicating good stability. g-C
N
/Ag/TiO
exhibited better photocatalytic reduction of U(VI) under visible light irradiation, which is mainly ascribed to Z-scheme photocatalytic mechanism assisted by the LSPR effect (Local Surface Plasmon Resonance). Ag with plasmon resonance effect on the loading has a strong absorption of photon energy. In addition, an intermediate charge transfer channel is formed between Ag and the semiconductor to inhibit the combination of photogenerated electrons and holes, resulting in a significant increase in the photocatalytic activity of the photocatalyst. This idea has some significance in design of other composite photocatalytic systems. |
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ISSN: | 0273-1223 |