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Molecularly imprinted La-doped mesoporous titania films with hydrolytic properties toward organophosphate pesticides

Carboni, Davide and Malfatti, Luca and Pinna, Alessandra and Lasio, Barbara and Tokudome, Yasuaki and Takahashi, Masahide and Innocenzi, Plinio (2013) Molecularly imprinted La-doped mesoporous titania films with hydrolytic properties toward organophosphate pesticides. New Journal of Chemistry, Vol. 37 (10), p. 2995-3002. eISSN 1369-9261. Article.

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DOI: 10.1039/c3nj00291h

Abstract

The present work is aimed at developing a titania-based mesoporous film with catalytic properties toward organophosphate pesticides by combining two different approaches: the molecular imprinting and the self-assembly with a supramolecular template. The mesoporosity of the material has been obtained by using a tri-block copolymer (Pluronic F127) as a micellar template while the molecular imprinted cavities have been templated by a complex between La 3+ and bis-4-nitro-phenyl-phosphate. The template removal allowed opening, in one step, both the mesopores and the imprinted cavities with a simultaneous estimation of the active sites. The catalytic activity of the molecularly imprinted and not imprinted films toward the pesticide Paraoxon® has been evaluated by means of UV-Vis spectroscopy titration of the 4-nitro-phenolate released by the Paraoxon® hydrolysis. The analysis of the initial rates of molecularly imprinted and not imprinted films has shown that the presence of a very low number of molecular cavities improves the catalytic properties of the imprinted film when compared to the not imprinted films and the background hydrolysis.

Item Type:Article
ID Code:9233
Status:Published
Refereed:Yes
Uncontrolled Keywords:Titania-based mesoporous film, molecular imprinting, self-assembly, supramolecular template
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Architettura, Design e Urbanistica > LMNT-Laboratorio di Scienza dei Materiali e NanoTecnologie
Publisher:Royal Society of Chemistry
eISSN:1369-9261
Copyright Holders:© 2013 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique
Deposited On:02 Oct 2013 09:12

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