Detection of intermediates in the TiO2-assisted photodegradation of
Rhodamine B under visible light irradiation |
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Authors: | LI Jing-yi MA Wan-hong LEI Peng-xiang and ZHAO Jin-cai |
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Institution: | 1. College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, China;Centre for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China 2. Centre for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China |
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Abstract: | The photocatalytic degradation of dye Rhodamine B (RhB) in the presence of TiO2 nanostripe or P25 under visible light irradiation was investigated. The degradation intermediates were identified using Infrared spectra (IR spectra), 1H nuclear magnetic resonance (1HNMR) spectra, and gas chromatography-mass spectroscopy (GC-MS). The IR and the 1HNMR results showed that the large conjugated chromophore structure of RhB was efficiently destroyed under visible light irradiation in both the photocatalytic systems (TiO2 nanostripe or P25 and Rhodamine B systems). GC-MS results showed that the main identified intermediates are ethanediotic acid, 1,2-benzenedicarboxylic acid, 4-hydroxy benzoic acid and benzoic acid, which are almost the same in the TiO2 nanostripes and P25 systems. This work provides a good insight into the reaction pathway(s) for the TiO2-assisted photocatalytic degradation of dye pollutants under visible light irradiation. |
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Keywords: | TiO2 visible light irradiation Rhodamine B (RhB) visible light irradiation Rhodamine B photodegradation intermediates dye pollutants work good insight reaction pathway benzoic acid results large chromophore structure photocatalytic degradation systems spectroscopy nuclear magnetic resonance Infrared spectra presence |
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