Immobilized Nano-TiO2 Photocatalysts for the Degradation of Three Organic Dyes in Single and Multi-Dye Solutions
Abstract
:1. Introduction
2. Models Adopted
3. Materials and Methods
3.1. Quantification of Dyes in Single, Binary, and Ternary Mixtures
3.2. Nanotubular TiO2 Production and Characterization
3.3. Photocatalytic Degradation Test
3.4. Characterization of Dyes in Single-Dye, Binary, and Ternary Mixtures
4. Results
4.1. Oxide Characterization
4.2. Calibration Curves
4.3. Dyes Degradation
4.4. Dyes Characterization
5. Discussion
- Direct Red 80 is a tetra-azo dye with a strong absorbance in the UV-Visible region that is characterized by four azo bonds (–N=N–); these constitute not only its chromophores, but also its weak points, where the molecule is more easily broken by photogenerated radicals. This dye is also characterized by the presence of six sulfonic groups (–SO3−) that enhance its solubility [53]. The high molecular weight (1373.07 g·mol−1) and the large amount of benzene and naphthalene rings suggest a difficult mineralization, as indeed observed, especially if compared with MB and RhB.
- Methylene Blue is a heterocycle dye characterized by a chromophore thiazine group (–C=N– and –C=S– bonds) [54], which represents the most active site for radical oxidation. Its molecular mass is the lowest among the evaluated dyes (319.85 g·mol−1), which explains its faster photodegradation.
- Rhodamine B (479.01 g·mol−1) is a triphenylmethane dye characterized by the presence of a conjugated xanthene group (which is in turn bonded to four N–ethyl groups) [55]. This chromophore results in one of the most photoactive sites during photodegradation by radical species.
- Direct Red 80 is supposed to degrade starting from the azo bond cleavage, followed by desulfonation and dihydroxylation, thus forming aromatic compounds that may mineralize in CO2, H2O, SO42−, and NH3 [60].
- Methylene Blue is supposed to degrade through different reaction pathways, starting from the thiazine group opening with –C=S– and –C=N– bond cleavage, passing through desulfonation and deamination, eventually mineralizing in CO2, H2O, SO42− and amine by-products [54].
- Regarding RhB, no proof of N-de-ethylation was found, since discoloration took place without the evidence of an absorbance peak shift from 555 to 500–520 nm, which is typical of this phenomenon [11]. Hence, it is assumed that degradation is linked to cleavage of the conjugated xanthene group, followed by deamination and dihydroxylation, which may lead to the formation of CO2, H2O, and amine by-products [55,61].
6. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Bellè, U.; Pelizzari, F.; Lucotti, A.; Castiglioni, C.; Ormellese, M.; Pedeferri, M.; Diamanti, M.V. Immobilized Nano-TiO2 Photocatalysts for the Degradation of Three Organic Dyes in Single and Multi-Dye Solutions. Coatings 2020, 10, 919. https://doi.org/10.3390/coatings10100919
Bellè U, Pelizzari F, Lucotti A, Castiglioni C, Ormellese M, Pedeferri M, Diamanti MV. Immobilized Nano-TiO2 Photocatalysts for the Degradation of Three Organic Dyes in Single and Multi-Dye Solutions. Coatings. 2020; 10(10):919. https://doi.org/10.3390/coatings10100919
Chicago/Turabian StyleBellè, Umberto, Filippo Pelizzari, Andrea Lucotti, Chiara Castiglioni, Marco Ormellese, MariaPia Pedeferri, and Maria Vittoria Diamanti. 2020. "Immobilized Nano-TiO2 Photocatalysts for the Degradation of Three Organic Dyes in Single and Multi-Dye Solutions" Coatings 10, no. 10: 919. https://doi.org/10.3390/coatings10100919