Studies on the Characterization and Interaction of Indole with FeO/CrO Using Spectroscopic Methods
The adsorption of indole onto chromium, iron and iron/chromium mixed oxides has been studied using UV–vis spectrophotometry, FT-IR spectroscopy and scanning electron microscopy (SEM) with the aim of obtaining an in-depth understanding of the adsorption mechanism. The maximum extent of adsorption was...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Hindawi - SAGE Publishing
2011-01-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.29.1.39 |
| Summary: | The adsorption of indole onto chromium, iron and iron/chromium mixed oxides has been studied using UV–vis spectrophotometry, FT-IR spectroscopy and scanning electron microscopy (SEM) with the aim of obtaining an in-depth understanding of the adsorption mechanism. The maximum extent of adsorption was observed in acidic medium (pH ∼ 4.0), the corresponding data being fitted by the Langmuir adsorption isotherm. Chromium oxide showed a higher adsorption affinity than the other metal/mixed metal oxides studied. The adsorption of indole onto the various metal oxides was also studied by SEM methods. FT-IR studies of indole, the metal oxides and the indole–metal oxide adduct showed that interaction occurred through attraction between the positively charged surface of the metal oxides and the negatively charged indole moieties. A dominating factor in the adsorption mechanism could be the π-electron system of the indole molecule. The results of the present study suggest that metal oxides could play an important role in the adsorption and removal of toxicological compounds possessing an indole ring system. |
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| ISSN: | 0263-6174 2048-4038 |