| Autor: |
Fang-yan Chen, Min-keng He, Yu-bin Tang, Cheng-yi He, Ke-ke Shu, Ming-yang Li |
| Předmět: |
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| Zdroj: |
Desalination & Water Treatment; Aug2020, Vol. 196, p247-255, 9p |
| Abstrakt: |
A core-shell g-C3N4/SiO2 nanocomposite was successfully synthesized by depositing g-C3N4, obtained from the sublimation of melamine and subsequent polymerization reaction in the gaseous phase, on the nano-silica. The as-prepared g-C3N4/SiO2 was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption-desorption, UV-vis diffuse reflectance spectroscopy. The visible- driven photocatalytic activity of g-C3N4/ SiO2 was evaluated by the degradation of tetracycline. The results indicate that the specific surface area of g-C3N4/SiO2 is 97.32 m2/g, which is 6.74 times as high as that of bulk g-C3N4 (14.44 m2/g). Compared to bulk g-C3N4, g-C3N4/SiO2 composite exhibits significantly enhanced photocatalytic activity for degradation of tetracycline and can degrade 72.7% of tetracycline within 60 min under visible-light irradiation. The photodegradation rate constant of tetracycline over g-C3N4/SiO2 is 7.2 times as high as that over bulk g-C3N4. The greatly enhanced photocatalytic activity of g-C3N4/SiO2 is due to coupling enlarged surface areas with the contribution of SiO2 in inhibition of the recombination of photo-induced electron-hole pair. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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