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https://hdl.handle.net/10316/24815
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. | URI: | https://hdl.handle.net/10316/24815 | 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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