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Zinc(II) Phthalocyanines Immobilized in Mesoporous Silica Al-MCM-41 and Their Applications in Photocatalytic Degradation of Pesticides

Zinc(II) Phthalocyanines Immobilized in Mesoporous Silica Al-MCM-41 and Their Applications in Photocatalytic Degradation of Pesticides

M Silva, M J F Calvete, N P F Gonçalves, H D Burrows, M Sarakha, A Fernandes, M F Ribeiro, M E Azenha, M M Pereira

J Hazard Mater. 2012 Sep 30;233-234:79-88.

PMID: 22835771

Abstract:

In the present study the authors investigated a set of three new zinc(II) phthalocyanines (zinc(II) tetranitrophthalocyanine (ZnTNPc), zinc(II) tetra(phenyloxy)phthalocyanine (ZnTPhOPc) and the tetraiodide salt of zinc(II)tetra(N,N,N-trimethylaminoethyloxy) phthalocyaninate (ZnTTMAEOPcI)) immobilized into Al-MCM-41 prepared via ship-in-a-bottle methodology. The samples were fully characterized by diffuse reflectance-UV-vis spectroscopy (DRS-UV-vis), luminescence, thermogravimetric analysis (TG/DSC), N(2) adsorption techniques and elemental analysis. A comparative study was made on the photocatalytic performance upon irradiation within the wavelength range 320-460nm of these three systems in the degradation of pesticides fenamiphos and pentachlorophenol. ZnTNPc@Al-MCM-41 and ZnTTMAEOPcI@Al-MCM-41 were found to be the most active systems, with the best performance observed with the immobilized cationic phthalocyanine, ZnTTMAEOPcI@Al-MCM-41. This system showed high activity even after three photocatalytic cycles. LC-MS product characterization and mechanistic studies indicate that singlet oxygen ((1)O(2)), produced by excitation of these immobilized photosensitizers, is a key intermediate in the photocatalytic degradation of both pesticides.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP100043014	Zinc(II) tetranitrophthalocyanine		100043-01-4	Price

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