期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 306, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121106
关键词
Synergetic effect; Charge transfer behavior; Tremella-like g-C (3) N (4); Single-atom silver; Photocatalytic
资金
- National Natural Science Foundation of China [21776117]
- Six talent peaks project in Jiangsu Province [XCL-014]
- National Key Research and Development Program of China [2016YFA0202401]
- Beijing Natural Science Foundation [2182066]
- Key Project of Tibet Natural Science Foundation [XZ2017ZRG-66]
- Natural Science Foundation of Hebei Province of China [B2018502067]
This study presents a method to embed single-atom silver into hierarchical tremella-like carbon nitride using a one-step reduction method, and proposes the photo-degradation mechanism of the resulting catalyst. Density functional theory calculations and physicochemical characterizations reveal the synergistic effect between single-atom silver and carbon nitride, which improves the photocatalytic activity.
It is significant to realize the synergistic effect of single-atom sites and its support to obtain excellent performance photocatalysts. Here, single-atom silver (SAAg) is embedded into the hierarchical tremella-like carbon nitride (3DT-CN) by an efficient one-step reduction method. The photo-degradation mechanism of SAAg/3DT-CN for tetracycline (TC) is first proposed. And the synergistic effect to improve photocatalytic activity is also discussed in depth. Density functional theory (DFT) calculations and physicochemical characterizations reveal that the synergistic effect of SAAg and 3DT-CN has improved the absorption capacity of visible light, the binding energy with oxygen, charge transfer behavior and other properties. Electron spin resonance (ESR) and capture experiments validate the active species involved in the reaction. The first-order kinetic constant of TC degradation by SAAg/3DT-CN is 8.4 times and 3.8 times that of 3DT-CN and AgNP/3DT-CN in 75 min, respectively. This work provides a meritorious structure-activity strategy for the removal of refractory antibiotics.
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