Phthalocyanine modified TiO2 or WO3-catalysts for photooxidation of sulfide and thiosulfate ions upon irradiation with visible light

Iliev, V.; Tomova, D.; Bilyarska, L.; Prahov, L.; Petrov, L.

doi:10.1016/s1010-6030(03)00170-9

Cited by 71 publications

(37 citation statements)

References 34 publications

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“…The injected electrons (e CB ) interact with molecular oxygen forming the superoxide anion radicals (O 2 •-) which could be the precursors of others active oxygen species such as •OH [6]. Both O 2 •-and •OH have been assigned as the key species in the mineralization mechanism of many hazardous chemical compounds [7][8][9][10]. For a sensitization efficient process, injection of electrons into CB must be much faster than the decay of the excited state to the ground state [11].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Cobalt (II) phthalocyanine has already been used both as a catalyst 12 and a visible light photosensitizer for photocatalytic reactions. 8 Because of this, CoPc with TiO2 can be versatile in different kinds of lighting conditions. The axial ligation of CoPc allows enhancement of the electronic capabilities of the complex and functionalize the complex to be used for molecular design.…”

Section: Resultsmentioning

confidence: 99%

“…5 Phthalocyanines (MPc, M = metal), with their applications as molecular conductors 6 and catalysts, 7 are very promising additives to TiO2. It has been reported that TiO2 impregnated with MPcs can be used as visible light activated photocatalysts for degrading sulfur-containing compounds 8 and organic pollutants 9 in wastewater.…”

Section: Introductionmentioning

confidence: 99%

Isonicotinic acid-ligated cobalt (II) phthalocyanine-modified titania as photocatalyst for benzene degradation via fluorescent lamp

Valinton¹,

Son²,

Zafra³

et al. 2016

10.5267/j.ccl

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The utilization of bis(isonicotinic acid)phthalocyaninatocobalt (II) [CoPc(isa)2] incorporated on TiO2 has been studied as a photocatalyst to degrade benzene vapor under fluorescent lamp (indoor light) conditions. The photocatalytic activity of [CoPc(isa)2]-TiO2 compared to TiO2 showed an increase in the extent of degradation. The axial isonicotinic acid ligand attached to CoPc improved the degradation rate of benzene as compared with unligated CoPc-TiO2 which may be attributed to the enhancement of electronic structure in the complex due to the additional isonicotinic acid ligand and its possible attachment to the TiO2 surface through the carboxylic acid moiety. Therefore, covalently-linked CoPc(isa)2 to TiO2 can enhance the extent of photodegradation of benzene and other common volatile organic compounds under indoor lighting conditions.

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“…(3)). The quantum yield of the redox process catalyzed by the molecular semiconductor is not high [25], which is a prerequisite for accomplishing electron transfer into the conduction band of TiO 2 @SiO 2 . The probability of electron transfer from the conduction band of excited MnPcS to the conduction band of TiO 2 @SiO 2 is higher.…”

Section: Photocatalytic Degradation Of Toxic Organic Pollutants By Immentioning

confidence: 99%

Catalysis of organic pollutant photodegradation by metal phthalocyanines immobilized on TiO2@SiO2

et al. 2011

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A TiO 2 @SiO 2 hybrid support was prepared by the sol-precipitation method using n-octylamine as a template. The photocatalyst manganese phthalocyanine tetrasulfonic acid (MnPcS) was immobilized on the support to form MnPcS-TiO 2 @SiO 2 . X-ray diffraction (XRD) and UV-Visible diffuse reflectance spectra (UV-Vis DRS) were employed to characterize the catalyst. The photocatalytic degradation of rhodamine B (RhB) and the catalytic oxidation of o-phenylenediamine (OPDA) under visible light irradiation were used as probe reactions. The mineralization efficiency and the degradation mechanism were evaluated using chemical oxygen demand (COD Cr ) assays and electron spin resonance (ESR), respectively. RhB was efficiently degraded by immobilized MnPcS-TiO 2 @SiO 2 under visible light irradiation. Complete decolorization of RhB occurred after 240 min of irradiation and 64.02% COD Cr removal occurred after 24 h of irradiation. ESR results indicated that the oxidation process was dominated by the hydroxyl radical (·OH) and superoxide radical (O 2 −· ) generated in the system.

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Phthalocyanine modified TiO2 or WO3-catalysts for photooxidation of sulfide and thiosulfate ions upon irradiation with visible light

Cited by 71 publications

References 34 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

Isonicotinic acid-ligated cobalt (II) phthalocyanine-modified titania as photocatalyst for benzene degradation via fluorescent lamp

Catalysis of organic pollutant photodegradation by metal phthalocyanines immobilized on TiO2@SiO2

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