Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

Zazouli, Mohammad Ali; Ghanbari, Farshid; Yousefi, Maryam; Madihi-Bidgoli, Soheila

doi:10.1016/j.jece.2017.04.037

Cited by 93 publications

(28 citation statements)

References 43 publications

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“…However, other authors reported the activation using UV-A and UV-C radiation. For instance, Zazouli et al [19] reported the use of different UV sources for the activation of PMS with a catalyst composed of Fe 3 O 4 –TiO 2 on the removal of the Brilliant Blue FCF dye.…”

Section: Resultsmentioning

confidence: 99%

“…Some authors have explored the activation of PMS by TiO 2 [16,17]. It seems that a synergistic effect occurs when both substances are coupled: TiO 2 decomposes PMS molecules, increasing the radical generation rate, and the photolysis of PMS can enhance the reactivity of TiO 2 and inhibit the recombination of the electron–hole pair through trapping photo-induced electrons [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Rodríguez-Chueca

Alonso

Singh

2019

IJERPH

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Industrial activity is one of the most important sources of water pollution. Yearly, tons of non-biodegradable organic pollutants are discharged, at the least, to wastewater treatment plants. However, biological conventional treatments are unable to degrade them. This research assesses the efficiency of photocatalytic activation of peroxymonosulfate (PMS) by two different iron species (FeSO4 and Fe3+-citrate) and TiO2. These substances accelerate methylene blue removal by the generation of hydroxyl and sulfate radicals. The required pH and molar ratios PMS:Fe are crucial variables in treatment optimization. The kinetic removal is reduced by the appearance of scavenger reactions in acidic and basic conditions, as well as by the excess of PMS or iron. The best performance is achieved using an Fe3+-citrate as an iron catalyst, reaching the total removal of methylene blue after 15 min of reaction, with a molar ratio of 3.25:1 (1.62 mM of PMS and 0.5 mM Fe3+-citrate). Fe3+-citrate reached higher methylene blue removal than Fe2+ as a consequence of the photolysis of Fe3+-citrate. This photolysis generates H2O2 and a superoxide radical, which together with hydroxyl and sulfate radicals from PMS activation attack methylene blue, degrading it twice as fast as Fe2+ (0.092 min−1 with Fe2+ and 0.188 min−1 with Fe3+-citrate). On the other hand, a synergistic effect between PMS and titanium dioxide (TiO2) was observed (SPMS/TiO2/UV-A = 1.79). This synergistic effect is a consequence of PMS activation by reaction with the free electron on the surface of TiO2. No differences were observed by changing the molar ratio (1.04:1; 0.26:1 and 0.064:1 PMS:TiO2), reaching total removal of methylene blue after 80 min of reaction.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Rodríguez-Chueca

Alonso

Singh

2019

IJERPH

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“…8. After the addition of sulfuric acid, the anions (X-), X• (anion radical) are produced which have lower redox potential compared to sulfate and hydroxyl radicals (Zazouli et al, 2017):…”

Section: Effect Of Phmentioning

confidence: 99%

Ecological contribution of Fenton process for generation of a ready-to-reuse dyeing and finishing effluent

Miled

Ladhari²

2020

WSA

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In this study, real wastewater from a dyeing factory and previously treated by biological processes was decolorized by Fenton oxidation. Direct and reactive dyebaths and the related auxiliaries constituted the polluted effluents. A synthetic wastewater was also prepared in the same way in order to compare degradation performance. The study was performed with a systematic approach, searching optimum values of H2O2 and FeSO4 concentrations, pH, temperature and the chemical structure of each tested dye. Depollution results showed that the oxidation behaviour of synthetic and real wastewaters was very similar, especially during the first stage where the breaking of chromophore groups allowed fast colour removal. However, it was found that higher ratios of [H2O2]/[FeSO4] must be engaged in the case of real wastewaters. Results also showed that the catalytic oxidation yielded a fast and complete depollution at [H2O2]/[FeSO4] = 70, pH 3 and temperature 40°C. For experiments with direct dye, colour and COD removals were, respectively, 90% and 87% in the case of real wastewater. Reactive real wastewater showed non-stable oxidation evolution due to the hydrolysed dyestuff and this led to 83% and 45% decolourization and COD removal, respectively. Better depollution results were noted for the synthetic wastewater experiments. This finding was related to the non-stable composition of the real wastewater and the unknown chemical and physical interferences between its compounds. After sedimentation, reuse of the treated wastewater for new dyeing experiments was also investigated. For this purpose, the whole process was run under complete recycling mode and the previously treated effluent was re-used as fresh dyebath. Results in terms of colour depth and fastness showed that dyeing performances were very similar, and an important opportunity is offered by reusing wastewater treated by Fenton oxidation process.

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“…SO 4 −• has a longer half‐life than OH • due to its preference for electron transfer reactions . Thus, persulfate (PS) and peroxomonosulfate (PMS), which serve as common oxidants, are applied in sulfate radicals‐based AOPs …”

Section: Introductionmentioning

confidence: 99%

Ultrasound Accelerated Oxidation of Organic Dyes by a Micron‐Sized Copper/Peroxomonosulfate System

Liu

Zhang

Wang

et al. 2020

CLEAN Soil Air Water

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Experiments on the degradation of acid orange 7 (AO7) using micron-sized zero-valent copper (ZVC) are conducted in acidic aqueous solution under ultrasonic (US) irradiation. The US/ZVC/peroxymonosulfate (PMS) process for AO7 degradation is significantly better than that of an independent system. Based on the characterization of ZVC, it is observed that the corrosion speed of ZVC increases after ultrasound, owing to which a greater amount of Cu + (0-3.03 mg L −1 ) and Cu 2+ are produced. Exposure to US irradiation increases the available surface area of the catalysts to generate many new reactive sites for the degradation process. The AO7 degradation rate after the addition of a new copper reagent-neocuproine hemihydrate-from 6.33% to 100% proved that Cu + is the main activator of PMS. Results indicated that free radicals (OH • and SO 4 −• ) act as activators of PMS in the process. And higher ultrasound power, lower solution pH, and a larger ZVC dose are favorable for AO7 removal.

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Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

Cited by 93 publications

References 43 publications

Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Ecological contribution of Fenton process for generation of a ready-to-reuse dyeing and finishing effluent

Ultrasound Accelerated Oxidation of Organic Dyes by a Micron‐Sized Copper/Peroxomonosulfate System

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