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Title: Zinc(II) phthalocyanines immobilized in mesoporous silica Al-MCM-41 and their applications in photocatalytic degradation of pesticides
Authors: Silva, M. 
Calvete, M. J. F. 
Gonçalves, N. P. F. 
Burrows, H. D. 
Sarakha, M. 
Fernandes, A. 
Ribeiro, M. F. 
Azenha, M. E 
Pereira, M. M. 
Keywords: Zinc(II) phthalocyanines; Al-MCM-41; Photocatalysis; Pesticide; Singlet oxygen
Issue Date: Sep-2012
Publisher: Elsevier
Citation: SILVA, M. [et al.] - Zinc(II) phthalocyanines immobilized in mesoporous silica Al-MCM-41 and their applications in photocatalytic degradation of pesticides. "Journal of Hazardous Materials". ISSN 0304-3894. Vol. 233–234 (2012) p. 79-88
Serial title, monograph or event: Journal of Hazardous Materials
Volume: 233-234
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), N2 adsorption techniques and elemental analysis. A comparative study was made on the photocatalytic performance upon irradiation within the wavelength range 320–460 nm 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 (1O2), produced by excitation of these immobilized photosensitizers, is a key intermediate in the photocatalytic degradation of both pesticides.
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2012.06.059
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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