fulltext.study @t Gmail

Tetrakis-2,3-[5,6-di-(2-pyridyl)-pyrazino]porphyrazine, and its Cu(II) complex as sensitizers in the TiO2-based photo-degradation of 4-nitrophenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
27351 44017 2011 7 PDF Available
Title
Tetrakis-2,3-[5,6-di-(2-pyridyl)-pyrazino]porphyrazine, and its Cu(II) complex as sensitizers in the TiO2-based photo-degradation of 4-nitrophenol
Abstract

The tetrapyrrolic macrocycle tetrakis-2,3-[5,6-di-(2-pyridyl)-pyrazino]porphyrazine, [Py8TPyzPzH2], and its copper(II) derivative, [Py8TPyzPzCu] were used as sensitizers adsorbed on TiO2 (anatase) particles for the UV (300–400 nm) photo-degradation of 4-nitrophenol (4-NP) in water suspensions. A 3.5-fold increase of photocatalytic power over bare TiO2-anatase has been observed in the case of the Cu(II) complex and of more than a factor of two for the free base. Compared with previous data obtained with anatase samples impregnated with some structurally similar porphyrins and phthalocyanines derivatives, these results represent a significant improvement. On the contrary, upon impregnation with [Py8TPyzPzCu], both TiO2-rutile and TiO2-Degussa P25 did not show any improvement of their photocatalytic efficiency. Experimental evidences indicate that formation of singlet oxygen does not contribute to the beneficial effect of the macrocycles. Hydrogen peroxide was found not to participate to the 4-NP depletion. Some photo-bleaching of the adsorbed dye has also been observed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The title microcycle porphyrazines adsorbed on TiO2 (anatase) are efficient sensitizers for the UV photo-degradation of 4-nitrophenol in water. ► A 3.5-fold increase of photocatalytic power over bare TiO2-anatase is observed in the case of the Cu(II) complex. ► Structurally similar porphyrins and phthalocyanines adsorbed on anatase are less efficient than our porphyrazines derivatives. ► Singlet oxygen does not contribute to the beneficial effect of the macrocycles. Hydrogen peroxide was found not to participate to the 4-NP depletion.

Keywords
Porphyrazine macrocycles; Sensitizers; TiO2 photocatalysts; 4-Nitrophenol photo-degradation
First Page Preview
Tetrakis-2,3-[5,6-di-(2-pyridyl)-pyrazino]porphyrazine, and its Cu(II) complex as sensitizers in the TiO2-based photo-degradation of 4-nitrophenol
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 220, Issue 1, 30 April 2011, Pages 77–83
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us