期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 307, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121185
关键词
Photocatalysis-self-Fenton system; Carbon defects; Oxygen reduction reaction; 2, 4-DCP degradation; DFT calculation
资金
- Natural Science Foundation of China [51979081, 52100179]
- Fundamental Research Funds for the Central Universities [B210202052]
- National Science Funds for Creative Research Groups of China [51421006]
- PAPD
A photocatalysis-self-Fenton system was constructed using garland g-C3N4 with carbon defects (GCN-PSFs) for pollutants degradation. Carbon defects in GCN not only improve 2e(-) ORR but also accelerate charge separation, resulting in the generation of abundant HO· radicals for efficient degradation of organic pollutants.
Photocatalytic two-electron oxygen reduction reaction (2e(-)ORR) has been regarded as a promising strategy to solve the disadvantage of Fenton technology (constant addition of H2O2). Herein, a photocatalysis-self-Fenton system was constructed on garland g-C3N4 with carbon defects (GCN-PSFs) for pollutants degradation. Carbon defects in the obtained GCN not only accelerate charge separation but also improve 2e(-) ORR. As expected, the apparent rate constant for 2,4-DCP degradation by GCN-PSFs enhances to 0.070 min(-1), which is 5.4, 3.3 and 2.6 times as that of BCN, BCN-PSFs and GCN. The capture experiments and electron spin resonance indicate that the high activity is attributed to abundant center dot OH radicals, which are formed from the in-situ produced H2O2. Density functional theory (DFT) calculation confirms that the carbon defects in GCN is favorable for photocatalytic 2e(-) ORR to H2O2. This work provides a new insight for high-efficient degradation of organic pollutants by PSFs.
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