UV-induced decolourization of acid alizarine violet N by homogeneous advanced oxidation processes

Sadik, Wagih A.; Nashed, Adel W.

doi:10.1016/j.cej.2007.05.018

Cited by 14 publications

(5 citation statements)

References 29 publications

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“…However, generation of a non-selective and powerful oxidant, • OH radicals [28,29] by direct photolysis of added hydrogen peroxide (H 2 O 2 + h → 2 • OH) significantly enhanced the degradation of the dye, since complete decolorization (dye + • OH → products) was obtained in less than Because of the low molar absorptivity of H 2 O 2 at 254 nm (18.6-19.6 l/mol cm) [30], theoretically an excess of H 2 O 2 is needed to produce more • OH radicals. However in our previous work [31], in addition to other reports [32,33], we observed that the concentration of H 2 O 2 may either enhance or inhibit the photoreaction rate depending on concentration. Therefore an optimum concentration of H 2 O 2 in the reaction course must be reached.…”

Section: Effect Of H 2 Omentioning

confidence: 37%

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

Elmorsi

Riyad

Mohamed

et al. 2010

Journal of Hazardous Materials

203

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Section: Effect Of H 2 Omentioning

confidence: 37%

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

Elmorsi

Riyad

Mohamed

et al. 2010

Journal of Hazardous Materials

203

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“…They preferentially disproportionate and produce hydrogen peroxide and dioxygen (reaction (20)): On the other hand, several authors have reported that the peroxide self-decomposition rate, which is strongly pH dependent, partly contributes to the decrease of the k app values in alkaline medium (reaction (21)): 27,35 2 They preferentially disproportionate and produce hydrogen peroxide and dioxygen (reaction (20)): On the other hand, several authors have reported that the peroxide self-decomposition rate, which is strongly pH dependent, partly contributes to the decrease of the k app values in alkaline medium (reaction (21)): 27,35 2…”

Section: The Effect Of the Initial H 2 O 2 Concentrationmentioning

confidence: 99%

Decolorization of textile azo dye reactive orange 16 with UV/H2O2 process

et al. 2012

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The photochemical decolorization of C.I. Reactive Orange 16 (RO16), a reactive textile azo dye by the UV/H2O2 process using a batch photoreactor with UV lamps emitting at 253.7 nm, was studied. Complete decolorization of 50.0 mg dm-3 initial dye concentration was achieved in less than 6 min under optimal conditions (25 mM initial peroxide concentration, at pH 7.0 and with UV light intensity 1950 μW cm-2). The effect of experimental variables, such as initial pH, initial concentration of H2O2, initial dye concentration, and the intensity of UV light was studied. The highest decolorization rates were performed at peroxide concentration in range from 20 mM up to 40 mM, above which decolorization was inhibited by a scavenging effect of peroxide. The decolorization was more efficient in neutral pHs. The efficiency of the process was improved in lower initial dye concentration and at higher intensity of UV light

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“…NZVI alone in the absence of H 2 O 2 was found to have no obvious effect on the decolorization of the dye. According to some reports [10,11], the concentration of H 2 O 2 may either enhance or inhibit the degradation rate. Therefore, an optimum concentration of H 2 O 2 in AFP must be reached.…”

Section: Resultsmentioning

confidence: 99%

Removal of a Di-Azo Dye Acid Red 73 Synthetic Wastewater by Advanced Fenton Process Based on Nanoscale Zero-Valent Iron

Chen

Wang

2012

AMR

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In this study, the removal of a di-azo dye, C.I. Acid Red 73 synthetic wastewater was investigated using advanced Fenton process based on nanoscale zero-valent iron (NZVI) that was synthesized by the aqueous phase borohydride reduction method in the laboratory. NZVI has been characterized by SEM. The influences of NZVI dosage, H2O2 concentration and initial pH value in the process of dye removal by advanced Fenton process were studied in a batch setting. The color removal efficiency was found to be decreased with increase of initial pH, and increased with increase of NZVI and H2O2 concentration. By using proposed process with NZVI dose of 0.02 g/L and H2O2 concentration of 1.0 mM, at 30 min the Acid Red 73 color removal was more than 90%.

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UV-induced decolourization of acid alizarine violet N by homogeneous advanced oxidation processes

Cited by 14 publications

References 29 publications

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

Decolorization of textile azo dye reactive orange 16 with UV/H2O2 process

Removal of a Di-Azo Dye Acid Red 73 Synthetic Wastewater by Advanced Fenton Process Based on Nanoscale Zero-Valent Iron

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