Degradation of atrazine using metalloporphyrins supported on TiO2 under visible light irradiation

Granados-Oliveros, Gilma; Páez‐Mozo, Edgar A.; Ortega, Fernando Martínez; Ferronato, Corinne; Chovelon, Jean‐Marc

doi:10.1016/j.apcatb.2009.01.001

Cited by 149 publications

(90 citation statements)

References 58 publications

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“…After cooling and solvent removal under vacuum, porphyrin was dissolved in 250 mL of 0.1M NaOH solution. Porphyrin was precipitated with a 1 M HCl solution, dissolved in ethanol and recrystallized by solvent evaporation [26,32,33] TcPPM was adsorbed on TiO 2 surface according to the following procedure [26]: 0.25 g TiO 2 were added to 250 mL of 0.2 mM TcPPM ethanolic solution. The mixture was stirred overnight at 60 o C. The solid was filtered, washed with ethanol in order to remove the unadsorbed dye and dried at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Due to the good excited state properties of Zn and metal-free complexes, the sensitization of TiO 2 by these porphyrins has been preferably studied [5,25]. In photocatalytic terms, several metalporphyrins adsorbed on TiO 2 have been evaluated in the degradation of different organic molecules [26][27][28]. However, it is not clear the role of metal on photoactivity.…”

Section: Introductionmentioning

confidence: 99%

“…This process is also required for regeneration of oxidized dye [12]. Given their *Address correspondence to this author at the IRCELYON, UMR CNRS 5256, Université de Lyon, 43 Bd du novembre 1918 69622 Villeurbanne, France; Tel: 00 33 4 72 43 26 38; E-mails: chovelon@univ-lyon1.fr, jean-marc.chovelon@ircelyon.univ-lyon1.fr primary role in photosynthesis, the use of porphyrins as light harvesters on semiconductors is particularly attractive [14]. Porphyrins have an extensive system of delocalized electrons and very strong absorption in the visible region [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Photoactivity of Metal-Phenylporphyrins Adsorbed on TiO2 Under Visible Light Radiation: Influence of Central Metal

Granados-Oliveros¹,

Ortega²,

Páez‐Mozo³

et al. 2010

TOMSJ

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A set of Co, Cu, Zn and metal-free phenylporphyrins were studied by spectroscopic (UV-vis, FTIR) and quantum-chemical methods. The Q and Soret bands were identified in the UV-vis spectra of solid samples. In all the complexes the frontier molecular orbitals (OMs) predict that the electronic processes sites are localized on the ligand rather than in the metal atom. Metal ion has a largely influence on energy of OMs. The calculated values of electronic transitions between the OMs are in good agreement with the UV-vis data. Phenyl porphyrins were attached onto TiO 2 to be evaluated as photocatalysts, under visible light irradiation. The interaction of porphyrins with TiO 2 surface was investigated using UV-vis and FT-IR spectroscopies and it was found that the dyes were adsorbed to the semiconductor by carboxylate groups. Degradation of luminol and photooxidation of terephthalic acid to 2-hydroxyterephthalic acid (TAOH) were employed as probe reactions. Luminol was degraded from 20 -60% in presence of O 2 . In the same way, the formation of TAOH values of comprises between 0.12 -0.17 mM, in presence of H 2 O 2 and O 2 was obtained. It was found that superoxide anion radicals (O 2 • _ ) are primarily formed and they are the precursor for the hydroxyl radicals (•OH) production when H 2 O 2 is added to suspension. Influence of metal on photoactivity was analyzed, specifically, in terms of: the nature of metal (number of d electrons), photophysical properties and energies of frontier molecular orbitals (OMs). Apparently, energy of OMs is an important factor which could affect photoactivity of sensitizers attached on TiO 2 .

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photoactivity of Metal-Phenylporphyrins Adsorbed on TiO2 Under Visible Light Radiation: Influence of Central Metal

Granados-Oliveros¹,

Ortega²,

Páez‐Mozo³

et al. 2010

TOMSJ

Self Cite

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“…The use of metalloporphyrins supported on TiO 2 as a potential system for ATR removal utilising visible light has been studied. Granados-Oliveros et al [169] prepared, analysed and compared metalloporphyrin systems with four different metal centres; Cu(II), Fe(III), Zn(II) and metalfree, for their photocatalytic degradation activities. It was deemed that a system of copper(II) tetra (4-carboxyphenol) porphyrin (TcPPCu(II)) was the best photocatalyst with 82% reduction in ATR after a one hour period (Fig.…”

Section: R Fagan Et Al / Materials Science In Semiconductor Processmentioning

confidence: 99%

A review of solar and visible light active TiO2 photocatalysis for treating bacteria, cyanotoxins and contaminants of emerging concern

Fagan

McCormack

Dionysiou

et al. 2016

Materials Science in Semiconductor Processing

497

195

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“…Dye-sensitization has been employed to extend the absorption from the UV range to the visible range. Organic dyes are usually transition metal complexes with low lying excited states, including polypyridine complexes, phthalocyanines, and metalloporphyrins [23][24][25][26]. However, the promise of such dye-sensitized TiO 2 materials and devices for practical applications is still under debate because of the instability of organic dyes on light irradiation [27].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly and photocatalysis of mesoporous TiO2 nanocrystal clusters

et al. 2010

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Mesoporous nanocrystal clusters of anatase TiO 2 with large surface area and enhanced photocatalytic activity have been successfully synthesized. The synthesis involves the self-assembly of hydrophobic TiO 2 nanocrystals into submicron clusters, coating of these clusters with a silica layer, thermal treatment to remove organic ligands and improve the crystallinity of the clusters, and finally removing silica to expose the mesoporous catalysts. With the help of the silica coating, the clusters not only maintain their small grain size but also keep their mesoporous structure after calcination at high temperatures (with BET surface area as high as 277 m 2 /g). The etching of SiO 2 also results in the clusters having high dispersity in water. We have been able to identify the optimal calcination temperature to produce TiO 2 nanocrystal clusters that possess both high crystallinity and large surface area, and therefore show excellent catalytic efficiency in the decomposition of organic molecules under illumination by UV light. Convenient doping with nitrogen converts these nanocrystal clusters into active photocatalysts in both visible light and natural sunlight. The strategy of forming well-defined mesoporous clusters using nanocrystals promises a versatile and useful method for designing photocatalysts with enhanced activity and stability.

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Degradation of atrazine using metalloporphyrins supported on TiO2 under visible light irradiation

Cited by 149 publications

References 58 publications

Photoactivity of Metal-Phenylporphyrins Adsorbed on TiO2 Under Visible Light Radiation: Influence of Central Metal

Photoactivity of Metal-Phenylporphyrins Adsorbed on TiO2 Under Visible Light Radiation: Influence of Central Metal

A review of solar and visible light active TiO2 photocatalysis for treating bacteria, cyanotoxins and contaminants of emerging concern

Self-assembly and photocatalysis of mesoporous TiO2 nanocrystal clusters

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