Special Issue "New Trends in the Photocatalytic Removal of Organic Dyes"
Deadline for manuscript submissions: 30 April 2019
Prof. Vincenzo Vaiano
University Salerno, Department of Industrial Engineering, Via Giovanni Paolo 2 132, I-84084 Fisciano, Salerno, Italy
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Interests: photocatalysis for sustainable chemistry, photocatalytic and photo-Fenton processes for pollutant removal in wastewater, catalytic combustion of sewage sludge, decomposition and oxidative decomposition of H2S, hydrolysis of COS in the liquid phase
Currently, different types of dyes consisting of varied chemical compounds are used in the production of consumer products, including paints, textiles, printing inks, paper, and plastics, depending on the type of textile or product being dyed. The effluent generated by these activities are one of the main causes of environmental pollution, because the effluent coming from the dyeing industry is highly colored, causing damage to aquatic life. For this reason, water pollution due to the dyeing industry is a matter of great concern, as large quantities of effluent are discharged into water bodies. However, due to the low biodegradability of dyes, the typical biological treatment processes are not very effective in the treatment of wastewater containing dyes. In this context, heterogeneous photocatalysis can be effectively exploited for the removal of various dye pollutants present in liquid media. Heterogeneous photocatalysis may represent one of the main challenges in the field of the treatment and decontamination of water, because it is able to work at ambient temperature and atmospheric pressure. Its operating principle is based on the simultaneous action of the light source and a catalyst (semi-conductor), which allows the degradation of organic pollutants.
This Special Issue is focused on “New trends in the Photocatalytic Removal of Organic Dyes”, featuring the state-of-the-art in this field. Research papers related to the synthesis and characterization of novel photocatalysts (active under UV or visible light, as well as under solar light) and their uses in the removal of organic dyes from aqueous solutions are welcome in this Special Issue.
Prof. Vincenzo Vaiano
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.
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- Heterogeneous photocatalysis
- Organic dyes in water
- Novel photocatalysts
- Doped semiconductors
- Hybrid systems
- UV light, visible light, solar light
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Photoelectrocatalytic vs photocatalytic removal of organic water contaminants
Authors: Ioannis Papagiannis, George Avgouropoulos and Panagiotis Lianos
Affiliation: University of Patras, Greece
Abstract: Organic visible and near-UV light absorbing water contaminants have been photocatalytically degraded using titania photocatalyst. Mesoporous titania films were deposited on fluorine doped tin oxide (FTO) transparent electrodes and were used either free or under electric bias, which is known to accelerate decomposition rate. Emphasis has been placed on the structure of the film, its crystallinity, specific surface as well as the value of the applied bias. In addition, degradation rate was studied with respect to the nature and the concentration of the employed electrolyte. The results were referenced to model dyes, for example, methylene blue, but they may be extended to other categories such as pharmaceuticals or pesticides.
Title: De-ethylation and cleavage of Rhodamine B by zirconium phosphate/silver bromide composite photocatalyst
Authors: Monica Pica1*, Silvia Calzuola1, Anna Donnadio1, Pier Luigi Gentili2, Morena Nocchetti1 and Mario Casciola2*
1Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo, 1, 06123 Perugia (Italy)
2University of Perugia, Department of Chemistry, Biology and Biotechnologies, Via Elce di Sotto, 8, 06123 Perugia (Italy)
*Corresponding authors: [email protected]; [email protected]
Abstract: A composite heterogeneous photocatalyst based on silver bromide was prepared by reaction of silver exchanged zirconium phosphate (ZrP) and HBr. The ZrP/AgBr composite containing 53 wt% AgBr was tested in the photocatalytic degradation of Rhodamine B (RhB), exhibiting, with respect to pure AgBr, higher catalytic activity. As a matter of fact, the time needed to achieve a percentage of chromofore cleavage of about 90 % was 3 min for the composite vs 30 min needed for pure AgBr. The UV-Vis spectra of RhB solution, recorded at different irradiation times, were deconvoluted, in order to have information about the concentration of the species formed by de-ethylation and cleavege processes during photocatalysis, and to go insight of the degradation mechanism. The smaller particle size of AgBr in the composite, with respect to the pure AgBr sample, enhanced the dye adsorption onto the solid catalyst and, in turn, contributed to improve its catalytic activity. Moreover, the presence of ZrP did not alter the mechanism of the photodegradation process. The ZrP/AgBr turned out to be stable for at least three consecutive cycles.
Title: Fluorinated and platinized Titania as effective materials in the photocatalytic treatment of dyestuffs and stained wastewater coming from handicrafts factories
Abstract: In this study, commercial P25 and lab prepared TiO2 were modified by fluorination and platinum photodeposition. The catalysts thus obtained were extensively characterized and it was found that these modifications lead to improve the optical and photocatalytic properties of Titania. The materials prepared were tested in the photocatalytic degradation of different organic dyestuffs: methylene blue (MB) and commercial anilines employed in the staining of natural fibers. Photocatalysis was also studied in this work as an eco-friendly treatment of wastewater coming from Colombian handicrafts factories. Platinized and fluorinated commercial Titania (Pt-F-P25) has shown the best photocatalytic activity in the MB degradation; on the contrary, in the case of the anilines the highest degradation was obtained over fluorinated P25 (F-P25). These results can be explained by differences observed in the structure and in the adsorption of these dyestuffs over the photocatalysts surface. It was also found that the dyestuffs and bacterial concentration in wastewater samples noticeable decrease after treatment by using F- P25 as photocatalyst.