Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 8, Pages 3152-3156Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am200655h
Keywords
zinc oxide; heterojunction; hydroxyl radical; photocatalysis; humic acid
Funding
- National Research Fund for Fundamental Key Projects 973 [2011CB933200]
- Ministry of Science and Technology of China [2010DFA64680]
- National Natural Science Foundation of China [51043010]
- Chinese Academy of Sciences
- state key laboratory of pollution control and resource reuses [PCRR08004]
- State Key Laboratory Foundation of Ministry of Science and Technology of China [PCRRY09004]
- National Science and Technology major special water pollution control and governance [2008ZX07421-006]
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Different composite films prepared by coupling ZnO and nitrogen-doped ZnO (N-ZnO) were used to photodegrade humic acids (HA). The catalysts exhibit an activity in the order of glass/ZnO/N-ZnO > glass/N-ZnO > glass/ZnO > N glass/N-ZnO/ZnO when light is irradiated from the film to glass substrate. However, glass/ZnO/N-ZnO exhibits a lower activity than glass/N-ZnO/ZnO when light is illuminated from (IS glass to film. Moreover, glass/ZnO/N-ZnO shows a lower activity when light is irradiated from glass to film than that irradiated in the opposite direction. These results suggest that it is not always the case that the presence of a heterojunction at interface of two semiconductors can definitely result in improving the photoactivity of the heterostructure although it can suppress the recombination of photogenerated charge carriers. They also indicate that photodegradation of HA is mainly via the oxidization by HO center dot (rather than directly by O(2)(-) and h(+)), which is produced mainly by the reactions with h(+). This implies the importance of fabrication a right heterojunction at the interface between the composite materials when they are used for photocatalysis. We envision that this work will help to develop new photocatalysts, as well as to understand better the photocatalytic mechanism.
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