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Kaolin-supported nanoscale zero-valent iron for removing cationic dye-crystal violet in aqueous solution.
- Source :
- Journal of Nanoparticle Research; Aug2012, Vol. 14 Issue 8, p1-8, 8p, 1 Black and White Photograph, 5 Graphs
- Publication Year :
- 2012
-
Abstract
- The degradation of crystal violet in aqueous solution was investigated using kaolin-supported zero-valent iron nanoparticles (K-nZVI). It was found that K-nZVI with a ratio of kaolin:zero-valent iron nanoparticles (nZVI) at 1:1 was most effective in removing crystal violet. Batch experiments show that more than 97.29 % crystal violet was degraded using K-nZVI, while only 24.36 % was removed using nZVI after reacting for 7 min, where the solution contained 100 mg L crystal violet at pH 6.5. This is due to a decrease in aggregation of Fe nanoparticles and enhanced their reactivity in the presence of kaolin, which was confirmed by the characterization using scanning electron microscopy. X-ray diffraction shows the formation of iron oxide and hydroxide, while UV-Vis spectral shows that the absorption peak of crystal violet was reduced, as well as Fourier transform infrared shows that new bands were formed after K-nZVI reacting with crystal violet. These suggest that degradation of crystal violet by K-nZVI include the oxidation of iron, the adsorption of crystal violet onto the K-nZVI, the transformation of crystal violet to leuko-crystal violet, and finally the cleavage of C=C bond. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13880764
- Volume :
- 14
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of Nanoparticle Research
- Publication Type :
- Academic Journal
- Accession number :
- 79123796
- Full Text :
- https://doi.org/10.1007/s11051-012-0899-0