Abstract
Nanoclay minerals received considerable importance in the field of material applications and organic synthesis because of natural occurrence, greater surface area, good selectivity, ion exchange properties, economical, functional simplicity, easy modification, and environmental acceptability. The eco-friendly liquid-phase oxidation reaction of benzyl alcohol over modified nanoclays such as metal cation exchanged impregnated nanoclays and surfactant immobilized with oxyanions of Cr(VI) and Mn(VII) yields benzaldehyde. Surfactant immobilized (HDTMA-Cr(VI)/Mn(VII)-MMT-nanoclays) and impregnated Mn+-MMT-Cr(VI)/Mn(VII)-nanoclays were prepared and the activity of modified nanoclays were studied. The oxidation reactions were carried out by varying the molar mass of the modified nanoclays with active species, reaction period and amount of catalyst on the yield of benzaldehyde. Surfactant immobilized nanoclays were found to be more active than impregnated nanoclays. The percentage yield of the product was calculated using 2,4-dinitrophenylhydrazine derivative. The materials used for this analysis were examined under different characterization techniques like XRD, SEM and TGA. From the XRD spectra was observed that the interlamellar spacing of montmorillonite nanoclay, Al3+-MMT-nanoclay, HDTMA-Cr(VI)-MMT-nanoclay and HDTMA-Mn(VII)-MMT-nanoclay were 9.81Å, 9.931 Å, 27.6 Å and 28.0 Å respectively. The superficial area of montmorillonite nanoclay has higher than modified nanoclay which was confirmed by SEM images. The TGA analysis stated that the used nanomaterial is thermally stable. The product obtained, benzaldehyde was indicated by TLC and confirmed by spectral studies like FTIR, 1H NMR and GC–MS. The activity of regenerated modified nanoclays was studied under standard experimental conditions up to the fourth generation. The result of different solvents on the yield of aldehyde was determined. The materials used are naturally occurring, safe to handle, environmentally friendly and reusable.
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Acknowledgements
The authors would like to express gratitude to Mr Mauricio de O. Vaz, L3F Nano, Institute of Physics, UFRGS, Porto Alegre, Brazil for characterization assistance. The authors also acknowledge Management and Principal (Dr N Rana Pratap Reddy), Global Academy of Technology, Bengaluru, Karnataka, India for laboratory facilities.
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Bhaskar, M., Surekha, M. & Suma, N. Evaluation on the Activity of Surfactant Immobilized and Metal Cation Exchanged Impregnated Montmorillonite Nanoclays on Oxidation of Benzyl Alcohol. Chemistry Africa 3, 351–361 (2020). https://doi.org/10.1007/s42250-020-00125-8
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DOI: https://doi.org/10.1007/s42250-020-00125-8