期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 41, 页码 27826-27832出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp05186j
关键词
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资金
- National Science Foundation of China [51072117, 51171110]
- National Basic Research Program of China (973 Program) [2012CB619600]
- Shanghai Science and Technology Committee [10JC1407600, 13JC1403300]
Activated graphitic carbon nitride (g-C3N4) with enhanced photocatalytic capability under visible light irradiation was fabricated by using a facile chemical activation treatment method. In the chemical activation, a mixed solution of hydrogen peroxide and ammonia was employed. The yield can reach as high as 90% after the activation process. The activation process did not change the crystal structure, functional group, morphology and specific surface area of pristine g-C3N4, but it introduced H and O elements into the CN framework of g-C3N4, resulting in a broader optical absorption range, higher light absorption capability and more efficient separation of photogenerated electrons and holes. The photoactivity was investigated by the degradation of rhodamine B (RhB) under visible light irradiation. As compared to the pristine g-C3N4, the activated g-C3N4 exhibited a distinct and efficient two-step degradation process. It was found that the RhB dye in the activated g-C3N4 was mainly oxidized by the photogenerated holes. It is believed that sufficient holes account for the two-step degradation process because they would significantly improve the efficiency of the N-de-ethylation reaction of RhB.
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