abstract
The preparation of porphyrins and phthalocyanines covalently attached onto nanostructured magnetic supports consisting of magnetite nanoparticles coated with an amorphous silica shell is reported. The easy recovery of these heterogeneous photocatalysts, just by applying an external magnetic field, allows their reuse in multiple treatment cycles. The photocatalytic activity of the non-immobilized photosensitizers and the obtained hybrid materials was evaluated in the degradation of 17 beta-estradiol, as a model organic pollutant present in water, using batch and flow mode treatment systems, assisted by visible light radiation (4 mW cm(-2)). The flow mode system potentiated the photocatalytic capacity of these novel hybrid materials. In order to improve the process, further studies based on different photocatalyst concentration and pH conditions were performed. Reuse capacity of these materials was investigated upon three photocatalytic cycles. (C) 2017 Elsevier Ltd. All rights reserved.
keywords
LIGHT PHOTOCATALYTIC ACTIVITY; MAGNETIC NANOPARTICLES; SINGLET OXYGEN; PORPHYRIN; PHOTODEGRADATION; PHTHALOCYANINES; ESTRONE; OXIDE; PHARMACEUTICALS; ESTROGENS
subject category
Chemistry; Engineering; Materials Science
authors
Fernandez, L; Borzecka, W; Lin, Z; Schneider, RJ; Huvaere, K; Esteves, VI; Cunha, A; Tome, JPC
our authors
Wioleta Anna Borzecka
PhD Student
Zhi Lin
Principal Researcheracknowledgements
Thanks are due to FCT/MEC for the financial support to QOPNA (FCT UID/QUI/00062/2013), CESAM (FCT UID/MAR/LA0017/2013), CICECO (FCT UID/CTM/50011/2013) and CQE (FCT UID/QUI/0100/2013) research units, through national funds and where applicable cofinanced by the FEDER, within the PT2020 Partnership Agreement. We further wish to thank the Seventh Framework Programme (FP7-People-2012-ITN) for funding the SO2S project (grant agreement number: 316975).