Rapid Decolorization of Cobalamin
The photocatalytic decolorization of cobalamin was carried out in aqueous solution of different types of catalysts including ZnO, TiO2 (Degussa P25), TiO2 (Hombikat UV100), TiO2 (Millennium PC105), and TiO2 (Koronose 2073) by using UVA source of irradiation. The effect of various parameters such as...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2012/495435 |
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| author | Falah H. Hussein Ahmed F. Halbus |
| author_facet | Falah H. Hussein Ahmed F. Halbus |
| author_sort | Falah H. Hussein |
| collection | DOAJ |
| description | The photocatalytic decolorization of cobalamin was carried out in aqueous solution of different types of catalysts including ZnO, TiO2 (Degussa P25), TiO2 (Hombikat UV100), TiO2 (Millennium PC105), and TiO2 (Koronose 2073) by using UVA source of irradiation. The effect of various parameters such as photocatalyst amount, cobalamin concentration, type of catalyst, pH of aqueous solution, light intensity, addition of H2O2, flow rate of O2, type of current gas, and temperature on photocatalytic oxidation was investigated. The results indicated that the photocatalytic decolorization of cobalamin was well described by pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. The effect of temperature on the efficiency of photodecolorization of cobalamin was also studied in the range 278–298 K. The activation energy was calculated according to Arrhenius plot and was found equal to kJ·mol−1 for ZnO and kJ·mol−1 for TiO2 (Degussa P25). The results of the total organic carbon (TOC) analysis indicate that the rate of decolorization of dye was faster than the total mineralization. Decolorization and mineralization of cobalamin in the absence of light and/or catalyst were performed to demonstrate that the presence of light and catalyst is essential for the decolorization of this cobalamin. The results show that the activity of different types of catalysts used in this study was of the sequence: ZnO > TiO2 (Degussa P25) > TiO2 (Hombikat UV100) > TiO2 (Millennium PC105) > TiO2 (Koronose 2073). |
| format | Article |
| id | doaj-art-37e9f1c8e66c4703b8edab946d3b31fe |
| institution | OA Journals |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-37e9f1c8e66c4703b8edab946d3b31fe2025-08-20T02:08:00ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2012-01-01201210.1155/2012/495435495435Rapid Decolorization of CobalaminFalah H. Hussein0Ahmed F. Halbus1Chemistry Department, College of Science, Babylon University, P.O. Box 51002, Hilla, IraqChemistry Department, College of Science, Babylon University, P.O. Box 51002, Hilla, IraqThe photocatalytic decolorization of cobalamin was carried out in aqueous solution of different types of catalysts including ZnO, TiO2 (Degussa P25), TiO2 (Hombikat UV100), TiO2 (Millennium PC105), and TiO2 (Koronose 2073) by using UVA source of irradiation. The effect of various parameters such as photocatalyst amount, cobalamin concentration, type of catalyst, pH of aqueous solution, light intensity, addition of H2O2, flow rate of O2, type of current gas, and temperature on photocatalytic oxidation was investigated. The results indicated that the photocatalytic decolorization of cobalamin was well described by pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. The effect of temperature on the efficiency of photodecolorization of cobalamin was also studied in the range 278–298 K. The activation energy was calculated according to Arrhenius plot and was found equal to kJ·mol−1 for ZnO and kJ·mol−1 for TiO2 (Degussa P25). The results of the total organic carbon (TOC) analysis indicate that the rate of decolorization of dye was faster than the total mineralization. Decolorization and mineralization of cobalamin in the absence of light and/or catalyst were performed to demonstrate that the presence of light and catalyst is essential for the decolorization of this cobalamin. The results show that the activity of different types of catalysts used in this study was of the sequence: ZnO > TiO2 (Degussa P25) > TiO2 (Hombikat UV100) > TiO2 (Millennium PC105) > TiO2 (Koronose 2073).http://dx.doi.org/10.1155/2012/495435 |
| spellingShingle | Falah H. Hussein Ahmed F. Halbus Rapid Decolorization of Cobalamin International Journal of Photoenergy |
| title | Rapid Decolorization of Cobalamin |
| title_full | Rapid Decolorization of Cobalamin |
| title_fullStr | Rapid Decolorization of Cobalamin |
| title_full_unstemmed | Rapid Decolorization of Cobalamin |
| title_short | Rapid Decolorization of Cobalamin |
| title_sort | rapid decolorization of cobalamin |
| url | http://dx.doi.org/10.1155/2012/495435 |
| work_keys_str_mv | AT falahhhussein rapiddecolorizationofcobalamin AT ahmedfhalbus rapiddecolorizationofcobalamin |