Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 2, Pages 460-467Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp109578g
Keywords
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Funding
- National Natural Science Foundation of China [21033003, 20977016, 90922022, 20773024, U1033603]
- National Basic Research Program of China(973 Program) [2007CB613306, 2010CB234604]
- Program for Changjiang Scholars and Innovative Research Team in University [PCSIRT0818]
- Fujian Provincial Key Laboratory of Nanomaterials [NM10-01]
- NSF of Fujian province [2009J06004]
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Fluorinated In(OH)(y)S-z solid solutions were synthesized via a hydrothermal method. The photocatalytic degradation of rhodamine B (RhB) over the fluorinated In(OH)(y)S-z solid solutions revealed that the process of the de-ethylation of RhB was enhanced, while in the meantime, the rate of the mineralization of RhB was suppressed when In(OH)(y)S-z was fluorinated. To elucidate the opposite effects of fluorination on the two processes of photocatalytic degradation of RhB (de-ethylation and mineralization) over In(OH)(y)S-z, the adsorption of RhB over In(OH)(y)S-z with and without fluorination, the active species involved in the de-ethylation and the mineralization of RhB, were investigated, and the electronic structure of fluorinated In(OH)(y)S-z was studied. The results indicated that the major active species involved in the de-ethylation and the mineralization of RhB are different, that is, the hole direct oxidation leads to the de-ethylation of RhB, while the major active species responsible for the mineralization of RhB is the O-2(is approximately equal to) radical. The fluorination on In(OH)(y)S-z solid solutions on one hand can enhance the adsorption of RhB on the catalyst surface, leading to a higher rate in the de-ethylation of RhB. On the other hand, fluorination lowers the conduction band of In(OH)(y)S-z, which leads to a lower capability of the photogenerated electrons in the reduction of O-2 to give O-2(is approximately equal to) radicals. Our results clearly show that the fluorine modifications can have ambilateral effects on the photocatalytic performance of semiconductor photocatalysts depending on the specific photocatalytic reactions.
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