Influence of ionic strength in the adsorption and during photocatalysis of reactive black 5 azo dye on TiO2 coated on non woven paper with SiO2 as a binder

Aguedach, Abdelkahhar; Brosillon, Stéphan; Morvan, J.; Lhadi, El Kbir

doi:10.1016/j.jhazmat.2007.04.086

Cited by 98 publications

(39 citation statements)

References 30 publications

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“…When the saturation's constant of semiconductor oxide is exceed, the effect is adverse. Active sites of TiO 2 are blocked by excess dye, as observed at concentrations of 80 and 100 mg/L (25,26).…”

Section: Kinetics Removal and Rb5 (Imcrb5) Minimum Concentration Inhimentioning

confidence: 86%

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

et al. 2012

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Objective. Removal and detoxification of azo dye by photocatalysis with TiO 2 . Materials and methods. TiO 2 films were prepared by sedimentation at pH 1.3, using as support a borosilicate glass, annealed for 1 hour at 450 °C. Physical characterization was performed by Scanning Electron Microscopy, X-ray diffraction and UV/VIS spectrometry. Dye Black Reactive 5 removal was carried-out in a quartz photo-reactor. Results. Optical characterization revealed the films displayed evident TiO 2 spherical particles of various irregular sizes, porous, and without fractures. The average crystal size was 77.5 nm and 77.7 nm for 50 °C (dried temperature) and 450 ºC (annealed temperature) respectively. The energy of the band gap (GAP) was 3.02 and 2.68 eV respectively. Maximum concentration of dye that negatively affected color removal was 80 mg/L (17%). At lower dye's concentrations (10, 50 and 70mg/L) decolorization was greater than 80%. TiO 2 films were reused for five consecutive cycles of 6 hours at 10 mg/L (>80%), and three cycles of 10 hours at 70 mg/L (> 80%). Toxicity results demonstrate that Daphnia magna was more sensitive than Lactuca sativa. Conclusions. TiO 2 films obtained by sedimentation demonstrated a high reactive black 5 decolorization and COD removal (86% and 100%), as well as toxicity reduction.Key words: photocatalysis with TiO 2 , sedimentation techniques, reactive black 5, Lactuca sativa and Daphnia magna. ResumenDecoloración simultánea y la desintoxicación de reactivo negro 5 con TiO 2 depositadas sobre el vidrio de borosilicato por la técnica de sedimentación. Objetivo. Decolorización y disminución de la toxicidad de un azo colorante usando fotocatálisis con TiO 2 . Materiales y métodos. Las películas de TiO 2 fueron crecidas por sedimentación a pH 1,3 empleando vidrio de borosilicato como sustrato. La caracterización física se realizó por medio de microscopía electrónica de barrido, difracción de rayos X y espectrometría de absorción UV/vis. Los estudios de remoción del colorante Negro Reactivo 5, se realizaron en un fotoreactor de cuarzo. Resultados. De acuerdo con la caracterización óptica, las películas de TiO 2 presentaron partículas esféricas, con diferentes tamaños, irregulares y sin fracturas. El tamaño del cristal fue 77,5 nm y 77,7 nm para 50 y 450º C y la energía de banda prohibida fue 3,02 y 2,68 eV, respectivamente. La concentración máxima del colorante que afectó negativamente la remoción de color fue 80 mg/L (17%). A concentraciones más bajas de NR5 (10, 50 y 70 mg/L) la decoloración fue superior al 80%. Las películas de TiO 2 se reutilizaron por 5 ciclos de 6 horas a 10 mg/L y 3 ciclos de 10 h a 70 mg/L. Los estudios de toxicidad en Lactuca sativa y Daphnia magna demostraron que D. magna fue más sensible que L. sativa. Conclusión. Las películas de TiO 2 crecidas por sedimentación decoloraron el colorante negro reactivo 5 en un 86% y removieron la demanda química de oxígeno en un y 100%, igualmente redujeron la toxicidad.Palabras clave: fotocatálisis con TiO 2 , técnica de sed...

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Section: Kinetics Removal and Rb5 (Imcrb5) Minimum Concentration Inhimentioning

confidence: 86%

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

et al. 2012

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“…The removal of pesticides from aqueous solutions depends greatly on electrostatic parameters such as surface charge, pH and ionic strength [45]. Ionic strength plays a major role in the electrical double layer (EDL) structure of a hydrated particle.…”

Section: Effect Of Ionic Strengthmentioning

confidence: 99%

Synthesis, Characterization and Evaluation of Peanut Shells-Derived Activated Carbons for Removal of Methomyl from Aqueous Solutions

Akl¹,

Youssef²,

Hassan³

et al. 2016

J Environ Anal Toxicol

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“…RSM has already been successfully applied to different oxidation processes, such as TiO 2 -coated/UV oxidation [58], TiO 2 slurry/UV oxidation [59], O 3 oxidation [60], electrochemical oxidation [61], and Ti/TiO 2 photoelectrocatalysis of some dyes [14]. In this work, the experimental design for the photodiscoloration of MeO was done using RSM-BBD according to [62].…”

Section: Statistical Analysis Of the Experimental Data: Response Surfmentioning

confidence: 99%

Photocatalytic Discoloration of Dyes: Relation between Effect of Operating Parameters and Dye Structure

Camarillo

Rincón

2011

Chem Eng & Technol

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The process of TiO 2 /UV photocatalytic discoloration of wastewaters containing organic dyes is influenced by a number of variables. In this paper, the effects of some of these parameters, i.e., mass of catalyst, initial dye concentration, and pH, were related to the structural nature of the dyes investigated, azo and anthraquinone dyes, two families that are representative of about 75 % of the dyes marketed nowadays. Both bibliographical and own experimental data were used to analyze and discuss the photocatalytic discoloration in terms of dye structure and degradation pathways. It is shown that azo dyes (Methyl Orange, Metanil Yellow, Acid Orange 7, and Reactive Red 120) are more easily discolored than Reactive Blue 19 (anthraquinone dye), due to the higher molecular stability of the latter. It is also shown that azo dye discoloration is more influenced by the initial dye concentration, whereas recalcitrant anthraquinone dyes (Reactive Blue 19) mainly demand for basic pH values to generate enough OH . radicals. Concerning TiO 2 loading, both the bibliographical and current research data showed no effect of this variable in the experimental range analyzed.

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Influence of ionic strength in the adsorption and during photocatalysis of reactive black 5 azo dye on TiO2 coated on non woven paper with SiO2 as a binder

Cited by 98 publications

References 30 publications

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

Synthesis, Characterization and Evaluation of Peanut Shells-Derived Activated Carbons for Removal of Methomyl from Aqueous Solutions

Photocatalytic Discoloration of Dyes: Relation between Effect of Operating Parameters and Dye Structure

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