FEDERICO PERSICO^1,2, MAURIZIO SANSOTERA^1,2*, NICOLE SCHEPIS¹, LUCA MAGAGNIN¹, WALTER NAVARRINI^1,2*
* Corresponding authors
1. Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131, Milano, Italy
2. Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, Via G. Giusti 9, 50121 Firenze, Italy

KEYWORDS: Photocatalysis; water treatment; turbid solution; titanium dioxide; Crystal Violet; advanced oxidation processes.
ABSTRACT: The crystal violet (CV) dye has been chosen to study the photooxidation activity of titanium dioxide immobilized into a transparent fluoropolymeric matrix toward organic pollutants. The photoactive matrix was directly coated on the UV source by applying a TiO₂- containing fluorinated ionomeric dispersion and a perfluorinated transparent amorphous polymer in an appropriate sequence. The photocatalytic activity of the multilayered coating towards the hydrosoluble organic CV dye was evaluated in transparent solution and in highly turbid suspension. The turbidity was obtained by dispersing insoluble microparticles of calcium sulfate in the polluted aqueous solution. The photoabatement rates obtained in transparent and in turbid conditions were 0.0918 min^-1 and 0.0300 min^-1, respectively. The TiO₂ nanoparticle dispersed in the fluorinated matrix revealed a higher photocatalytic activity than simple dispersed TiO _... ...
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