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Title: Reusable hybrid nanocomposites for clean degradation of dye waste under visible light
Authors: Colbea, Claudiu 
Oancea, Petruta 
Puiu, Mihaela 
Galaon, Toma 
Raducan, Adina 
Affiliations: University of Bucharest, Romania 
University of Bucharest, Romania 
University of Bucharest, Romania 
National Research and Development Institute for Industrial Ecology, ECOIND 
University of Bucharest, Romania 
Keywords: Photosensitized TiO2;Azo dyes oxidation;Photocatalysis: kinetics
Issue Date: Dec-2021
Publisher: Elsevier
Herein we report on the degradation performance of three phthalocyanine-photosensitized TiO2 nanocomposites on waste dyes such as Ponceau 4R, Sella Fast Black, Congo Red, Select Brown, Indigo Carmine, Brilliant Blue, Fuchsin, Fluorescein and Naphthol Yellow S. All experiments were carried on at neutral pH, in ambient conditions, requiring only visible light and no additional oxidants. Chlorinated copper (II) α-phthalocyanine
(αClCuPc), copper (II) β-phthalocyanine (βCuPc), and tetra-sulfonated copper (II) β-phthalocyanine (βSCuPc)
increased the decolourization efficiency of TiO2 from moderate to high degrees, i.e., 30–100%, even for recalcitrant azo-dyes such as Ponceau 4R, Sella Fast Black, Congo Red and Select Brown. Moreover, the photosensitized catalysts display good thermal, operational stability, and reusability, providing total organic carbon (TOC) removal above 50% within 180 min in batch conditions. The reactive oxygen species were generated in the presence of dissolved oxygen, through the activation of phthalocyanine/TiO2 and it can be combined further with enzymatic/microbial treatment to achieve total mineralization.
Materials Today Communications, vol. 30, 2022, doi:10.1016/j.mtcomm.2021.103091
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