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Fe2O3/3DOM BiVO4: High-performance photocatalysts for the visible light-driven degradation of 4-nitrophenol.
- Source :
-
Applied Catalysis B: Environmental . Mar2017, Vol. 202, p569-579. 11p. - Publication Year :
- 2017
-
Abstract
- The three-dimensionally ordered macroporous (3DOM) BiVO 4 and its supported iron oxide ( x Fe 2 O 3 /3DOM BiVO 4 , x = 0.18, 0.97, and 3.40 wt%) photocatalysts were prepared using the ascorbic acid-assisted polymethyl methacrylate-templating and incipient wetness impregnation methods, respectively. Physicochemical properties of the materials were characterized by means of numerous analytical techniques, and their photocatalytic activities were evaluated for the degradation of 4-nitrophenol under visible light illumination. It is found that the BiVO 4 possessed a high-quality 3DOM architecture with a monoclinic crystal phase, and the Fe 2 O 3 was highly dispersed on the surface of 3DOM BiVO 4 . The x Fe 2 O 3 /3DOM BiVO 4 samples much outperformed the 3DOM BiVO 4 sample, and 0.97Fe 2 O 3 /3DOM BiVO 4 showed the best photocatalytic performance (98% 4-nitrophenol was degraded in the presence of 0.6 mL H 2 O 2 within 30 min of visible light illumination) and excellent photocatalytic stability. The introduction of H 2 O 2 to the reaction system could promote the photodegradation of 4-nitrophenol by providing the active OH species generated via the reaction of photoinduced electrons and H 2 O 2 . The pseudo-first-order reaction rate constants (0.0876–0.1295 min −1 ) obtained over x Fe 2 O 3 /3DOM BiVO 4 were much higher than those (0.0033–0.0395 min −1 ) obtained over 3DOM or Bulk BiVO 4 and Fe 2 O 3 /Bulk BiVO 4 , with the 0.97Fe 2 O 3 /3DOM BiVO 4 sample exhibiting the highest rate constant. The enhanced photocatalytic performance of 0.97Fe 2 O 3 /3DOM BiVO 4 was associated with its unique porous architecture, high surface area, Fe 2 O 3 − BiVO 4 heterojunction, good light-harvesting ability, high adsorbed oxygen species concentration, and excellent separation efficiency of photogenerated electrons and holes as well as the photo-Fenton degradation process. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 202
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 119219002
- Full Text :
- https://doi.org/10.1016/j.apcatb.2016.09.069