NDLI: Quantum Efficiency of Hydroxyl Radical Formation in a Composite Containing Nanocrystalline TiO 2 e Zinc Phthalocyanine , and the Nature of the Incident Radiation

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Quantum Efficiency of Hydroxyl Radical Formation in a Composite Containing Nanocrystalline TiO 2 e Zinc Phthalocyanine , and the Nature of the Incident Radiation

Content Provider	Semantic Scholar
Author	Batista, Paulo Dos Santos Souza, Danilo Maximiano, Rodolfo Vieira Neto, Newton M. Barbosa Machado, Antonio Eduardo Da Hora
Copyright Year	2013
Abstract	In this study, we investigate the generation of hydroxyl radicals mediated by a composite containing TiO2 and 1.6% m/m of zinc phthalocyanine (TiO2/ZnPc) in aqueous suspensions containing methanol as oxidisable substrate. The composite features a specific surface 20% less than the value estimated for TiO2 P25, probably due to the covering of the surface of the oxide by ZnPc and the pH of the isoelectric point of this composite equal of 5.5, about two units of pH lower than the value estimated for TiO2 P25, are probably related to the difference in photocatalytic activity found for these materials. To assess the influence of different spectral bands of electromagnetic radiation on the production of hydroxyl radicals, we used different sources of radiation in experiments conducted to estimate the quantum efficiency of hydroxyl radical formation (HO•), via photocatalytic oxidation of methanol. The association between zinc phthalocyanine and TiO2 has allowed the formation of a light absorber material with absorption spectral range extended to the visible region. Our results suggest that, despite the higher values of HO• for TiO2 P25, the combination of visible and ultraviolet radiation furnished by a high pressure mercury lamp without the protective bulb, or solar radiation, causes the composite to present good values for the same parameter.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ccsenet.org/journal/index.php/jmsr/article/download/26367/16843/
Language	English
Access Restriction	Open
Subject Keyword	Absorber Device Component Bands Digraphs and trigraphs Experiment Hydroxyl Radical Isoelectric Point Less Than Methanol Population Parameter Project 25 Quantum Radiation Solar Energy Suspensions Ultraviolet Rays ZAF Zn(II)-phthalocyanine oxidation sequestering of mercury trehalose biosynthetic process involved in ascospore formation zinc pyrithione 10 MG/ML Medicated Shampoo zinc(II) phthalocyanine trisulfonic acid
Content Type	Text
Resource Type	Article

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