Catalytic reduction of methylene blue by sulfide ions in the presence of nanoAlMCM-41 material |
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| Authors: | Sh Sohrabnezhad A Pourahmad R Rakhshaee A Radaee S Heidarian |
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| Institution: | 1. Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Chemistry, Faculty of Science, Islamic Azad University, Rasht Branch, Iran;3. Department of Chemistry, Islamic Azad University, Dezful Branch, Iran |
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| Abstract: | This article reports the reduction of methylene blue (MB) by sulfide ions (S2−) in aqueous solution by a nanoAlMCM-41 catalyst. The results obtained showed that, under acidic conditions (pH=2) MB was reduced to the Leuco methylene blue (LMB) form by sulfide ions and by changing the pH between 2.0 and 7.0 a reduction of the MB dye to the MBH2+ form was observed. In alkaline media (pH=8), a reduction of methylene blue by sulfide ions to the MBH2+ form and demethylation of the dye was observed simultaneously. The demethylation of MB leads to a thionine dye product. Using nanoAlMCM-41 but with encapsulated CoS nanoparticles only causes demethylation of MB in aqueous solution. |
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| Keywords: | Reduction Demethylation Leuco methylene blue Mesoporous nano crystal X-ray diffraction |
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