Photocatalytic degradation of saccharin under UV‐LED and blacklight irradiation

Davididou, Konstantina; McRitchie, Calum; Αντωνοπούλου, Μαρία; Konstantinou, Ioannis; Chatzisymeon, Efthalia

doi:10.1002/jctb.5349

Cited by 24 publications

(12 citation statements)

References 40 publications

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“…efficiency of the photo-Fenton process to degrade them in both DI and natural water ( Figures 3 and 4, respectively). Interestingly, the concentration of DP3 increases slightly with treatment in both water matrices and, in a similar way, DP3 is the last DP to evolve as in the study of Davididou et al (2017) before its complete oxidation [23]. In natural water, DPs degradation proceeds slower than in DI water due to the various inorganic and organic species that are present and can act as HO • scavengers [11].…”

Section: Degradation Productssupporting

confidence: 64%

Photo-Fenton treatment of saccharin in a solar pilot compound parabolic collector: Use of olive mill wastewater as iron chelating agent, preliminary results

Davididou

Chatzisymeon

Pérez-Estrada

et al. 2019

Journal of Hazardous Materials

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The aim of this work was to investigate the treatment of the artificial sweetener saccharin (SAC) in a solar compound parabolic collector pilot plant by means of the photo-Fenton process at pH 2.8. Olive mill wastewater (OMW) was used as iron chelating agent to avoid acidification of water at pH 2.8. For comparative purposes, Ethylenediamine-N, N-disuccinic acid (EDDS), a well-studied iron chelator, was also employed at circumneutral pH. Degradation products formed along treatment were identified by LC-QTOF-MS analysis. Their degradation was associated with toxicity removal, evaluated by monitoring changes in the bioluminescence of Vibrio fischeri bacteria. Results showed that conventional photo-Fenton at pH 2.8 could easily degrade SAC and its intermediates yielding k, apparent reaction rate constant, in the range of 0.64-0.82 L kJ, as well as, eliminate effluent's chronic toxicity. Both OMW and EDDS formed iron-complexes able to catalyse HO decomposition and generate HO. OMW yielded lower SAC oxidation rates (k = 0.05-0.1 L kJ) than EDDS (k = 2.21-7.88 L kJ) possibly due to its higher TOC contribution. However, the degradation rates were improved (k = 0.13 L kJ) by increasing OMW dilution in the reactant mixture. All in all, encouraging results were obtained by using OMW as iron chelating agent, thus rendering this approach promising towards the increase of process sustainability.

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Section: Degradation Productssupporting

confidence: 64%

Photo-Fenton treatment of saccharin in a solar pilot compound parabolic collector: Use of olive mill wastewater as iron chelating agent, preliminary results

Davididou

Chatzisymeon

Pérez-Estrada

et al. 2019

Journal of Hazardous Materials

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“…The term electric energy per order (E EO ) is defined as the energy required to degrade a pollutant by an order of magnitude. E EO values can be calculated from the following equation [55]:…”

Section: Energy Consumptionmentioning

confidence: 99%

Analysis of a Hybrid Suspended-Supported Photocatalytic Reactor for the Treatment of Wastewater Containing Benzothiazole and Aniline

Ferreiro

Villota

Lombraña

et al. 2019

Water

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In this work, a study of the main operating variables affecting TiO2/UV photocatalysis was carried out. The treatment of an industrial effluent containing aniline and benzothiazole from the manufacture of accelerants for vulcanization was performed in a TiO2-supported commercial photoreactor. The degradation of both contaminants was monitored by GC-MS analysis. The proposed experiments were able to properly identify the phenomenon of adsorption, as well as to improve the performance of the commercial photoreactor by adding small amounts of TiO2 in suspension. The removal performance, durability of the photocatalytic material, and energy costs were analysed. The results showed that the use of suspensions intensifies the degradation obtaining an improvement of 23.15% with respect to the use of the supported catalyst. For an aniline and benzothiazole solution, the best operating conditions were found at pH = 12.0, introducing 60.0 mg L−1 of suspended TiO2 together with the existing supported catalyst.

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“…Current photocatalytic processes in aqueous solutions involve different types of reactors [13][14][15][16][17][18][19][20][21][22], which can be classified in different groups according to their geometry (e.g., tubular or cylindrical, rectangular or square reactors, etc. ), liquid agitation techniques (e.g., continuous flow reactors, e.g., stirrer rotation) and lighting source including mainly low or medium pressure ultraviolet lamps [23][24][25][26][27], currently being replaced by LED lighting [28][29][30][31][32][33][34], which can reduce the size of the reactors, allowing the making of compact photo reactors known as mini reactors or micro reactors [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

In situ Decolorization Monitoring of Textile Dyes for an Optimized UV-LED/TiO2 Reactor

2019

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Heterogeneous photocatalysis, using photocatalysts in suspension to eliminate diverse contaminants, including textile wastewater, has several advantages. Nevertheless, current absorbance and decolorization measurements imply sample acquisition by extraction at a fixed rate with consequent photocatalyst removal. This study presents online monitoring for the decolorization of six azo dyes, Orange PX-2R (OP2), Remazol Black B133 (RB), Procion Crimson H-EXL (PC), Procion Navy H-EXL (PN), Procion Blue H-EXL (PB), and Procion Yellow H-EXL (PY), analyzing the spectrum measured in situ by using the light scattering provided by the photocatalyst in suspension. The results obtained have corroborated the feasibility of obtaining absorbance and decolorization measurements, avoiding disturbances in the process due to a decrease in the volume in the reactor.

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Photocatalytic degradation of saccharin under UV‐LED and blacklight irradiation

Cited by 24 publications

References 40 publications

Photo-Fenton treatment of saccharin in a solar pilot compound parabolic collector: Use of olive mill wastewater as iron chelating agent, preliminary results

Photo-Fenton treatment of saccharin in a solar pilot compound parabolic collector: Use of olive mill wastewater as iron chelating agent, preliminary results

Analysis of a Hybrid Suspended-Supported Photocatalytic Reactor for the Treatment of Wastewater Containing Benzothiazole and Aniline

In situ Decolorization Monitoring of Textile Dyes for an Optimized UV-LED/TiO2 Reactor

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