A Photo-Fentontreatment of a Mixture of Three Cationic Dyes

Bouafia-Chergui, Souad; Oturan, Nihal; Khalaf, Hussein

doi:10.1016/j.proeng.2012.01.1192

Cited by 17 publications

(10 citation statements)

References 19 publications

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“…However, the initial attacking rate of BB 41 to the surface of the photocatalyst was higher. According to Bouafia et al [10], who have applied the photo-Fenton process, the rate of oxidation of BB 41 was also higher than that of BY 28, which is coherent with our findings. Kinetic results obtained by varying the irradiation time have shown that the 1st order Langmuir-Hinshelwood kinetics is applicable under these steady conditions.…”

Section: Photocatalytic Degradation Experimentssupporting

confidence: 92%

Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO₂Composite Photocatalsyt

Otsukarci

Kalpaklı

2016

Acta Phys. Pol. A

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Scarcity of water in today's world has led to scientific researches for finding smarter ways of discharging and re-using water located in the seas and lakes. That is how advanced oxidation technologies have emerged as one of the new discharging techniques to keep water sources clean. In our method we have synthesized praseodymium (Pr) doped TiO2-Montmorillonite composite photocatalyst by using acid sol-gel method. Pr, in the group of rare earth metals, is known for its ability to form Lewis bases in order to break down aldehydes, amines, etc., by decreasing the crystal size and consequently increasing the surface area. We have used the mineral form of the bentonite clay (montmorillonite) to increase the surface area of our composite photocatalyst. Two types of azo dyes which are commercially known as Basic Yellow 28 (BY 28) and Basic Blue 41 (BB 41) were used in experimants. These dyes are composed of different chemical structures: BY 28 is known as azomethine dye (-CH=N-), whereas BB 41 has one azo bond (-N=N-). The initial model dye concentrations were 100 ppm. Amount of 1.0 g/l of photocatalyst was used throughout the experiments. In order to evaluate degradation efficiency results, the dissolved organic carbon analyzer was used. We have found the optimum dark adsorption time to be under 15 minutes. By stirring under 15 minutes in the dark we have achieved efficiency of 52.50% for BY 28 and 66.74% for BB 41. On the other hand, by stirring under UV-A light irradiation for two hours we have achieved the overall degradation efficiency of 86.30% for BY 28 and 92.39% for BB 41. Our results show that higher adsorption and overall efficiencies were observed in BB 41 than in BY 28. Moreover, according to Water Pollution Control Regulations, the chemical oxygen demand limitations for textile industry are between 200-400 mg/l. To evaluate the degradation characteristics of Pr-doped TiO2-Montmorillonite composite, the change of chemical oxygen demand values with time for 100 mg/l of BY 28 and BB 41 were investigated. The obtained chemical oxygen demand values were 60.5 and 34.8 mg O2/l after 2 hours of oxidation processes for BY 28 and BB 41. As it can be seen from the results, obtained values are below the limitations.

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Section: Photocatalytic Degradation Experimentssupporting

confidence: 92%

Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO₂Composite Photocatalsyt

Otsukarci

Kalpaklı

2016

Acta Phys. Pol. A

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“…Direct photochemistry is not efficient either [7], while ozonolysis is quite slow [8]. In contrast, advanced oxidation processes (AOPs), which involve the highly oxidizing agent hydroxyl radicals ( Å OH), such as: H 2 O 2 photolysis [9], Fenton's reagent [2,5], photo-Fenton [10][11][12], and heterogeneous photocatalysis [13] were shown to be able to degrade efficiently nitrophenols.…”

Section: Introductionmentioning

confidence: 99%

Oxidation/mineralization of 2-Nitrophenol in aqueous medium by electrochemical advanced oxidation processes using Pt/carbon-felt and BDD/carbon-felt cells

Oturan¹,

Hamza

Ammar

et al. 2011

Journal of Electroanalytical Chemistry

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“…The Fenton process is one of the most studied AOPs and other processes derive from it as electro-Fenton (Oturan et al 2001;Pimentel et al 2008; Barhoumi et al 2016), photoFenton (Trabelsi-Souissi et al 2011Bouafia-Chergui et al 2012;Romero et al 2016), sono-Fenton (Sundararaman et al 2009; Chakma and Moholkar 2013; Khataee et al 2016), and so forth. Nevertheless, it still shows some contradictory results regarding the ideal conditions to obtain high Responsible editor: Philippe Garrigues * Antover Panazzolo Sarmento antoverps@ufg.br efficiencies on the pollutant degradation (Hermosilla et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Phenol degradation by Fenton-like process

Sarmento

Borges

Matos

et al. 2016

Environ Sci Pollut Res

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The main objective of this study was to investigate the optimum conditions for the Fenton-like process on phenol degradation, using Mn(2+) as a supporting catalyst in the Fenton reaction. The effect of the independent factors [H2O2], [Fe(2+)], [Mn(2+)] and t (reaction time) was evaluated on the efficiency of phenol degradation at two pHs (3 and 5). The experimental arrangement adopted was the Box-Behnken delineation, with the phenol concentration after the treatments suggested as response variable. At less acidic pH (5), regardless of [Mn(2+)], it was observed that the conventional Fenton process was the most efficient alternative, considering the optimum condition: 2.65 mmol L(-1) for [H2O2], 0.36 mmol L(-1) for [Fe(2+)], and 90 min for t. It was observed that the addition of Mn(2+) helped the phenol degradation at more acidic pH (3), obtaining the optimum condition: 6.17 mmol L(-1) for [H2O2], 0.36 mmol L(-1) for [Fe(2+)], 1.09 mmol L(-1) for [Mn(2+)], and 90 min for t.

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A Photo-Fentontreatment of a Mixture of Three Cationic Dyes

Cited by 17 publications

References 19 publications

Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO₂Composite Photocatalsyt

Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO₂Composite Photocatalsyt

Oxidation/mineralization of 2-Nitrophenol in aqueous medium by electrochemical advanced oxidation processes using Pt/carbon-felt and BDD/carbon-felt cells

Phenol degradation by Fenton-like process

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A Photo-Fentontreatment of a Mixture of Three Cationic Dyes

Cited by 17 publications

References 19 publications

Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO2Composite Photocatalsyt

Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO2Composite Photocatalsyt

Oxidation/mineralization of 2-Nitrophenol in aqueous medium by electrochemical advanced oxidation processes using Pt/carbon-felt and BDD/carbon-felt cells

Phenol degradation by Fenton-like process

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Product

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Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO₂Composite Photocatalsyt

Effect of Dye Type on Montmorillonite-Supported Pr-Doped TiO₂Composite Photocatalsyt