Influence of chemical structure of dyes, of pH and of inorganic salts on their photocatalytic degradation by TiO2 comparison of the efficiency of powder and supported TiO2

Guillard, C.; Lachheb, Hinda; Houas, Ammar; Ksibi, Mohamed; Elaloui, Elimame; Herrmann, Jean-Marie

doi:10.1016/s1010-6030(03)00016-9

Cited by 471 publications

(221 citation statements)

References 29 publications

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“…The reason behind this behavior is that MB is a cationic dye that was attracted toward negatively charged photocatalyst at high pH value. Due to this attraction, more dye molecules were adsorbed on the catalyst surface and photocatalytic activity was increased at higher pH [21]. Another factor that plays an important role is the availability of hydroxyl ions at high pH value.…”

Section: Effect Of Phmentioning

confidence: 99%

Photocatalytic Activity of Al2O3.Fe2O3 Synthesized by Ultrasonic-Assisted Mechanical Stirring

Ullah¹,

Ali²,

Hanif³

et al. 2017

Pol. J. Environ. Stud.

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Section: Effect Of Phmentioning

confidence: 99%

Photocatalytic Activity of Al2O3.Fe2O3 Synthesized by Ultrasonic-Assisted Mechanical Stirring

Ullah¹,

Ali²,

Hanif³

et al. 2017

Pol. J. Environ. Stud.

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“…Chen et al (2003) have reported a similar phenomenon of increased adsorption of certain dye-constituent aromatics on the surface of TiO2 in the presence of phosphate anions. The negatively charged phosphate anions strongly adsorbed onto the TiO2 surface may favor not only the adsorption of AMX species bearing a positive (Chen et al 2003) or neutral (Guillard et al 2003) charge on the -NH2 group, but also the formation of free hydroxyl radicals via the enhancement of the separation of the photogenerated hole and electron facilitated by an inner-sphere surface complex, as suggested by Zhao et al (2008). The same authors thus concluded that phosphate modification accelerates the degradation of pollutants either more prone to hydroxyl radical attack or with weak adsorption on pure TiO2 particles.…”

Section: Influence Of Inorganic Ions and Scavengersmentioning

confidence: 99%

Assessment of solar driven TiO2-assisted photocatalysis efficiency on amoxicillin degradation

Pereira

Reis

Nunes

et al. 2013

Environ Sci Pollut Res

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The objective of this work was to evaluate the efficiency of a solar TiO2-assisted photocatalytic process on amoxicillin (AMX) degradation, an antibiotic widely used in human and veterinary medicine. Firstly, solar photolysis of AMX was compared with solar photocatalysis in a compound parabolic collectors pilot scale photoreactor to assess the amount of accumulated UV energy in the system (QUV) necessary to remove 20 mg L −1 AMX from aqueous solution and mineralize the intermediary byproducts. Another experiment was also carried out to accurately follow the antibacterial activity against Escherichia coli DSM 1103 and Staphylococcus aureus DSM 1104 and mineralization of AMX by tracing the contents of dissolved organic carbon (DOC), low molecular weight carboxylate anions, and inorganic anions. Finally, the influence of individual inorganic ions on AMX photocatalytic degradation efficiency and the involvement of some reactive oxygen species were also assessed. Photolysis was shown to be completely ineffective, while only 3.1 kJUVL −1 was sufficient to fully degrade 20 mg L −1 AMX and remove 61 % of initial DOC content in the presence of the photocatalyst and sunlight. In the experiment with an initial AMX concentration of 2 40 mg L −1 , antibacterial activity of the solution was considerably reduced after elimination of AMX to levels below the respective detection limit. After 11.7 kJUVL −1 , DOC decreased by 71 %; 30 % of the AMX nitrogen was converted into ammonium and all sulfur compounds were converted into sulfate. A large percentage of the remaining DOC was in the form of low molecular weight carboxylic acids. Presence of phosphate ions promoted the removal of AMX from solution, while no sizeable effects on the kinetics were found for other inorganic ions. Although the AMX degradation was mainly attributed to hydroxyl radicals, singlet oxygen also plays an important role in AMX self-photosensitization under UV/ visible solar light.

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“…The ZPC of the TiO 2 catalyst (degussa P25) is pH 6.8. [28][29][30] Figure 6 shows that the reaction presented a maximum degradation rate at pH 6.0 (the natural pH). At pH 6.0, the TiO 2 surface was weakly charged (near ZPC), a situation in which molecules probably reach the catalyst surface more easily.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Styrene photocatalytic degradation reaction kinetics

Taffarel

Lansarin

Moro

et al. 2011

J. Braz. Chem. Soc.

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A reação de degradação fotocatalítica do estireno foi estudada utilizando-se TiO 2 P-25 (Degussa) como catalisador. Os experimentos foram realizados em um reator "slurry" em bateladas, com controle de temperatura, empregando-se uma lâmpada UV. Foram estudados os efeitos do pH, da concentração inicial de estireno, da concentração do catalisador e da adição de H 2 O 2 sobre a velocidade da reação. Os resultados mostraram que, em 90 min, cerca de 95% da quantidade inicial da molécula foi consumida por fotocatálise. Verificou-se também que a reação segue uma cinética de primeira ordem para concentrações iniciais de estireno, entre 15,27 e 57,25 ppm, a 30 °C. A análise cromatográfica das amostras coletadas durante os experimentos de fotodegradação identificou o benzaldeído como um dos intermediários dessa reação. Além disso, a adição de H 2 O 2 aumentou a velocidade de degradação.The aqueous styrene photocatalytic degradation reaction was evaluated using TiO 2 P-25 (Degussa) as a catalyst. These experiments were accomplished in a batch slurry reactor with temperature control and a UV lamp. The effects of the initial styrene concentration, the catalyst concentration, the hydrogen peroxide addition and the initial pH of the solution on the reaction were evaluated. The experimental results showed that in 90 min, 95% of the initial styrene was degraded by photocatalysis. It was verified that the styrene degradation rate fits a pseudo-first-order kinetics for initial styrene concentrations between 15.27 and 57.25 ppm, at 30 °C. The chromatographic analysis of the samples collected during the photocatalytic degradation revealed benzaldehyde as one of the intermediates. The addition of H 2 O 2 accelerated the degradation reaction until the system reached a certain optimum peroxide concentration in the reactor. Further H 2 O 2 additions resulted in a reaction rate reduction.

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Influence of chemical structure of dyes, of pH and of inorganic salts on their photocatalytic degradation by TiO2 comparison of the efficiency of powder and supported TiO2

Cited by 471 publications

References 29 publications

Photocatalytic Activity of Al2O3.Fe2O3 Synthesized by Ultrasonic-Assisted Mechanical Stirring

Photocatalytic Activity of Al2O3.Fe2O3 Synthesized by Ultrasonic-Assisted Mechanical Stirring

Assessment of solar driven TiO2-assisted photocatalysis efficiency on amoxicillin degradation

Styrene photocatalytic degradation reaction kinetics

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