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Degradation of bromothymol blue by ‘greener’ nano-scale zero-valent iron synthesized using tea polyphenols
Abstract
A green single-step synthesis of iron nanoparticles using tea (Camellia sinensis) polyphenols is described that uses no additional surfactants/polymers as capping or reducing agents. The expedient reaction between polyphenols and ferric nitrate occurs within a few minutes at room temperature and is indicated by color changes from pale yellow to dark greenish/black in the formation of iron nanoparticles. The synthesized iron nanoparticles were characterized using transmission electron microscopy (TEM), UV-visible and X-ray diffraction pattern (XRD). The obtained nanoparticles were utilized to catalyze hydrogen peroxide for treatment of organic contamination and results were compared with Fe-EDTA and Fe-EDDS. Bromothymol blue, a commonly deployed pH indicator, is used here as a model contaminant for free radical reactions, due to its stability in the presence of H2O2 and its absorbance in the visible range at pH 6. The concentration of bromothymol blue is conveniently monitored using ultraviolet-visible (UV-Vis) spectroscopy during treatment with iron-catalyzed H2O2. Various concentrations of iron are tested to allow for the determination of initial rate constants for the different iron sources.
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Cited by
Green synthesis of nanoparticles: Current developments and limitations
Ying, S., Guan, Z., Ofoegbu, P. C., Clubb, P., Rico, C., He, F., & Hong, J. (2022) · Environmental Technology & Innovation · doi:10.1016/j.eti.2022.102336 · Cited by 1,677
Wang, T., Lin, J., Chen, Z., Megharaj, M., & Naidu, R. (2014) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2014.07.006 · Cited by 503
Greener approach to nanomaterials and their sustainable applications
Varma, R. S. (2012) · Current Opinion in Chemical Engineering · doi:10.1016/j.coche.2011.12.002 · Cited by 358
Self-citationSmuleac, V., Varma, R., Sikdar, S., & Bhattacharyya, D. (2011) · Journal of Membrane Science · doi:10.1016/j.memsci.2011.05.054 · Cited by 349
Self-citationSong, Y., Kirkwood, N., Maksimović, Č., Zheng, X., O'Connor, D., Jin, Y., & Hou, D. (2019) · Science of The Total Environment · doi:10.1016/j.scitotenv.2019.01.347 · Cited by 325
Metadata
- Authors
- Hoag, G. E., Collins, J. B., Holcomb, J. L., Hoag, J. R., Nadagouda, M. N., & Varma, R. S.
- Venue
- Journal of Materials Chemistry
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2009
- Volume
- 19
- Issue
- 45
- Pages
- 8671
- ISSN
- 0959-9428 (ISSN-L)
- 1364-5501
- OpenAlex
- W1979529649
- Cited by
- 609
- References
- 0
- FWCI
- 5.24
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hoag, G. E., Collins, J. B., Holcomb, J. L., Hoag, J. R., Nadagouda, M. N., & Varma, R. S. (2009). Degradation of bromothymol blue by ‘greener’ nano-scale zero-valent iron synthesized using tea polyphenols. Journal of Materials Chemistry. https://doi.org/10.1039/b909148c
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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