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Synthesis and Structure of Nanocrystalline TiO2 with Lower Band Gap Showing High Photocatalytic Activity
Abstract
Nanocrystalline TiO2 was synthesized by the solution combustion method using titanyl nitrate and various fuels such as glycine, hexamethylenetetramine, and oxalyldihydrazide. These catalysts are active under visible light, have optical absorption wavelengths below 600 nm, and show superior photocatalytic activity for the degradation of methylene blue and phenol under UV and solar conditions compared to commercial TiO2, Degussa P-25. The higher photocatalytic activity is attributed to the structure of the catalyst. Various studies such as X-ray diffraction, Raman spectroscopy, Brunauer-Emmett-Teller surface area, thermogravimetric-differential thermal analysis, FT-IR spectroscopy, NMR, UV-vis spectroscopy, and surface acidity measurements were conducted. It was concluded that the primary factor for the enhanced activity of combustion-synthesized catalyst is a larger amount of surface hydroxyl groups and a lowered band gap. The lower band gap can be attributed to the carbon inclusion into the TiO2 giving TiO(2-2x)C(x) VO2**.
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Environmental applications of semiconductor photocatalysis
Hoffmann, M. R., Martin, S. T., Choi, W., & Bahnemann, D. W. (1995) · Chemical Reviews · doi:10.1021/cr00033a004 · Cited by 18,495
Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results
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Cited by
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Review of the anatase to rutile phase transformation
Hanaor, D. A. H., & Sorrell, C. C. (2011) · Journal of Materials Science · doi:10.1007/s10853-010-5113-0 · Cited by 3,394
Recent developments of zinc oxide based photocatalyst in water treatment technology: A review
Lee, K. M., Lai, C. W., Ngai, K. S., & Juan, J. C. (2016) · Water Research · doi:10.1016/j.watres.2015.09.045 · Cited by 2,341
Nagaveni, K., Hegde, M. S., & Madras, G. (2004) · The Journal of Physical Chemistry B · doi:10.1021/jp047917v · Cited by 567
Self-citationNanomaterials via solution combustion synthesis: a step nearer to controllability
Wen, W., & Wu, J.-M. (2014) · RSC Adv. · doi:10.1039/c4ra10145f · Cited by 262
Metadata
- Authors
- Nagaveni, K., Hegde, M. S., Ravishankar, N., Subbanna, G. N., & Madras, G.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-02-19
- Volume
- 20
- Issue
- 7
- Pages
- 2900-2907
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2075546375
- Cited by
- 562
- References
- 2
- FWCI
- 9.39
- Type
- journal article
- Language
- en
- Open access
- closed
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