کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6454282 | 1418815 | 2017 | 8 صفحه PDF | دانلود رایگان |
- p-AgI dispersedly anchored on {001} facets of layered n-Bi2O2CO3 was fabricated.
- p-AgI/n-Bi2O2CO3 was highly effective and stable for 2-CP degradation under visible light.
- The strong interfacial interaction enhanced effective electron transfer from AgI to Bi2O2CO3.
- O2â generated on Bi2O2CO3 and holes on AgI were the main active species.
A close-connected p-AgI/n-Bi2O2CO3 heterojunction was synthesized by a one-step co-crystallization method. The visible-light-driven photoactivity of AgI was exceptionally enhanced by nearly 5 times through in-situ close contact with Bi2O2CO3. After seven cycling measurements, the photodegradation rate of 2-chlorophenol could be maintained at 88% and no Ag+ and Bi3+ could be detected in the reaction solution, indicating high photostability of the heterojunction photocatalyst. On the basis of the characterization of morphology, X-ray diffraction, Fourier-transform infrared spectra and X-ray photoelectron spectroscopy, AgI nanoparticles were selectively anchored on active {001} facets of layered Bi2O2CO3 sheets, and a strong interfacial interaction between p-AgI and n-Bi2O2CO3 was observed, which enhanced effective separation and transfer of the photo-generated electron-hole pair from AgI, resulting in the high photoactivity and photostability of AgI for the degradation and mineralization of 2-chlorophenol under visible light. By the studies of electron spin resonance and other experiments, the charge transfer process at the interface of p-AgI/n-Bi2O2CO3 was verified that the photoexcited electrons of the conduction band of AgI transferred to the conduction band of Bi2O2CO3 to react with surface adsorbed oxygen into O2-, while the photoexcited holes of the valence band of AgI could oxidize organic pollutants in water.
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Journal: Applied Catalysis B: Environmental - Volume 205, 15 May 2017, Pages 34-41