Photooxidation of the phenylazonaphthol AO20 on TIO2: kinetic and mechanistic investigations

Galindo, Catherine; Jacques, Patrice; Kalt, André

doi:10.1016/s0045-6535(01)00118-7

Cited by 327 publications

(147 citation statements)

References 22 publications

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“…5b. The results revealed that the degradation rate depends on the chromite mass and follows a similar relationship (r o µ [TiO 2 ]0.93) reported by Galindo et al (2001).…”

Section: Effect Of Chromite Masssupporting

confidence: 80%

“…5 and 9 (Huang et al 2008). Galindo et al (2001) set an empirical relation between the degradation rate and the mass of the used catalyst (r o µ [MC] n [dye]), where r o is the reciprocal initial rate, MC is the mass of the used catalyst and n is an exponent less than 1 for the studied dye, in relation to low mass of the used catalyst. The relation was represented by linear regression plot of ln (chromite mass) versus Ln (lo) with high correlation coefficient (R 2 = 1) in Fig.…”

Section: Effect Of Chromite Massmentioning

confidence: 99%

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Photocatalytic degradation and photo-Fenton oxidation of Congo red dye pollutants in water using natural chromite—response surface optimization

Abukhadra

Ibrahim

et al. 2017

Appl Water Sci

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Refined natural Fe-chromite was characterized by XRD, FT-IR, reflected polarized microscope, XRF and UV spectrophotometer. Photocatalytic degradation and photo-Fenton oxidation of Congo red dye by Fe-chromite was investigated using 1 mL H 2 O 2 . The degradation of dye was studied as a function of illumination time, chromite mass, initial dye concentration, and pH. Fe-chromite acts as binary oxide system from chromium oxide and ferrous oxide. Thus, it exhibits photocatalytic properties under UV illumination and photo-Fenton oxidation after addition of H 2 O 2 . The degradation in the presence of H 2 O 2 reached the equilibrium stage after 8 h (59.4%) but in the absence of H 2 O 2 continued to 12 h (54.6%). Photocatalytic degradation results fitted well with zero, first order and second order kinetic model but it represented by second order rather than by the other models. While the photo-Fenton oxidation show medium fitting with the second order kinetic model only. The values of kinetic rate constants for the photo-Fenton oxidation were greater than those for the photocatalytic degradation. Thus, degradation of Congo red dye using chromite as catalyst is more efficient by photo-Fenton oxidation. Based on the response surface analysis, the predicted optimal conditions for maximum removal of Congo red dye by photocatalytic degradation (100%) were 12 mg/l, 0.14 g, 3, and 11 h for dye concentration, chromite mass, pH, and illumination time, respectively. Moreover, the optimum condition for photoFenton oxidation of dye (100%) is 13.5 mg/l, 0.10 g, 4, and 10 h, respectively.

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“…5b. The results revealed that the degradation rate depends on the chromite mass and follows a similar relationship (r o µ [TiO 2 ]0.93) reported by Galindo et al (2001).…”

Section: Effect Of Chromite Masssupporting

confidence: 80%

Section: Effect Of Chromite Massmentioning

confidence: 99%

Photocatalytic degradation and photo-Fenton oxidation of Congo red dye pollutants in water using natural chromite—response surface optimization

Abukhadra

Ibrahim

et al. 2017

Appl Water Sci

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“…A wide range of methods has been developed for the removal of synthetic dyes from waters and wastewaters to decrease their impact on the environment. Conventional water treatment technologies such as solvent extraction, activated carbon adsorption, and chemical treatment process [such as oxidation by ozone (O 3 )] often produce hazardous byproducts and generate large amount of solid wastes, which require costly disposal or regeneration method (Slokar and Marechal 1998;Galindo et al 2001;Pandurangan et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

2015

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Traditional chemical, physical and biological processes for treating wastewater containing textile dye have such disadvantages as high cost, high energy requirement and generation of secondary pollution during treatment process. The advanced oxidation processes technology has been attracting growing attention for the decomposition of organic dyes. Such processes are based on the light-enhanced generation of highly reactive hydroxyl radicals, which oxidize the organic matter in solution and convert it completely into water, CO 2 and inorganic compounds. In this presentation, the photocatalytic degradation of dyes in aqueous solution using TiO 2 as photocatalyst under solar and UV irradiation has been reviewed. It is observed that the degradation of dyes depends on several parameters such as pH, catalyst concentration, substrate concentration and the presence of oxidants. Reaction temperature and the intensity of light also affect the degradation of dyes. Particle size, BETsurface area and different mineral forms of TiO 2 also have influence on the degradation rate.

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“…This negative effect of a high H 2 O 2 concentration may be due to the formation of HO • 2 , a species that is significantly less reactive than HO • . 33 The excess H 2 O 2 molecules on the catalyst surface may also act as powerful scavengers of radicals, 21,34 as shown in equations 3 and 4. Competition for adsorption by the styrene and hydrogen peroxide still occurs.…”

Section: Effect Of H 2 O 2 Additionmentioning

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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Photooxidation of the phenylazonaphthol AO20 on TIO2: kinetic and mechanistic investigations

Cited by 327 publications

References 22 publications

Photocatalytic degradation and photo-Fenton oxidation of Congo red dye pollutants in water using natural chromite—response surface optimization

Photocatalytic degradation and photo-Fenton oxidation of Congo red dye pollutants in water using natural chromite—response surface optimization

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

Styrene photocatalytic degradation reaction kinetics

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