TiO2/UV Photodegradation of Azo Dyes in Aqueous Solutions

Tang, W. Z.; Zhang, Z.; An, H.; Quintana, M. O.; Torres, D. F.

doi:10.1080/09593331808616507

Cited by 18 publications

(17 citation statements)

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“…Significant increase in degradation efficiency in range of pH [7 to 9] due to presence of -OH in the medium and near the surface of catalyst that leads to generation of hydroxyl radical but when the pH greater than 9 more of -OH are introduced in the reaction mixture which make the surface of the semiconductor negatively charged repulsive forces start interacting between negatively charged semiconductor surface and dye anions similar behaviour has also reported for the photo catalytic efficiency of TiO2 for degradation of dyes [12,13].…”

Section: Fig(3): Photodecomposion Rate Of Bdh By Different Ph (λ=750mentioning

confidence: 53%

Photodegradation of Commercial Dye 920 DB2 Using TiO2

Mahdi

2016

JNUS

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Photo decomposition of 920 (DB2) dye have been performed at (nm) in deionized water at 25C˚.Under irradiation Uv Lamp. The absorbance spectrum for this dye have been recorded with the time of irradiation in order to examine the kinetics of photo decay. The specific rate constant the (Kd) for the first order reaction have been calculated and found to be (Kd = 0.0248 min -1 ). Study the effect of various parameters such as catalyst loading, pH of the medium and initial dye concentration. On photodecomposition of 920 (DB2).

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Section: Fig(3): Photodecomposion Rate Of Bdh By Different Ph (λ=750mentioning

confidence: 53%

Photodegradation of Commercial Dye 920 DB2 Using TiO2

Mahdi

2016

JNUS

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“…In alkaline solution, MO molecules have negative charge and their adsorption is also expected to be affected by an augment in the density of

{TiO}_{2}^{-}

groups in the semiconductor's surface. Hence, due to the electrostatic repulsion, the substrate is weakly adsorbed (Lachheb et al., ; Tang, Zhang, An, Quintana, & Torres, ). There are two main possible reaction mechanisms which can contribute to the dye degradation: hydroxyl radical attack (Equation ) or direct oxidation by (

h_{normalν normalb}^{+}

; Equation ).…”

Section: Resultsmentioning

confidence: 99%

“…There are two main possible reaction mechanisms which can contribute to the dye degradation: hydroxyl radical attack (Equation ) or direct oxidation by (

h_{normalν normalb}^{+}

; Equation ). It has been proposed that

h_{normalν normalb}^{+}

are the main active species at low pH, while hydroxyl radicals are considered as the predominant reactive agent at circumneutral or high pH levels (Augugliaro et al., ; Guillard et al., ; Konstantinou, ; Tang et al., ).…”

Section: Resultsmentioning

confidence: 99%

Multivariate approach to hydrogenated TiO₂ photocatalytic activity under visible light

Pradenas

Yáñez

Suresh

et al. 2019

Water Environment Research

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The photocatalytic activity of hydrogenated TiO 2 was evaluated in the photooxidation of methyl orange (MO). The hydrogenation of TiO 2 was carried out by calcination of a mixture of TiO 2 P-25 and NaBH 4 , at 300 and 350°C for blue TiO 2 and black TiO 2 , respectively. An experimental design was made for the determination of the best reaction conditions for the oxidation of MO. The influence of catalyst dosage and pH on photocatalytic efficiency was optimized, and the degradation percentage of MO was the response factor. The photocatalytic reaction was performed using a Xenon lamp that simulates the solar light spectrum for the activation of the catalyst. It was determined that both blue and black TiO 2 show the greatest activity at pH = 2 and 0.8 g/L of catalyst. Additionally, the positive influence of hydrogen peroxide in the photocatalytic activity of both hydrogenated catalysts was determined. In parallel, COD and TOC were also studied. • Practitioner points• The extent of titania reduction by hydrogenation is dependent on the reaction time with sodium borohydride. • The extent of titania reduction affects the photocatalytic activity in the oxidation of methyl orange. An excess of catalyst reduction inhibits the oxidation of the dye because of the increase of recombination points. • The best reaction conditions were determined by multivariate optimization as pH 2 and 0.8 g L -1 of hydrogenated catalyst. • The addition of hydrogen peroxide into the reaction system improves the oxidation yield attributed to their electron accepting capacity.• Key words black TiO 2 ; blue TiO 2 ; hydrogen peroxide; methyl orange; photocatalysis; visible light

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“…The catalysts are affordable, non-toxic and also possess commercial availability and photochemical stability [4]. Among the different photocatalysts used TiO 2 has a wide band gap and therefore can effectively be used as a photocatalyst for the degradation of dye pollutants [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Photocatalytic Treatment of Textile Effluent using Semiconductor Oxide under UV Irradiation

Kavitha¹

2015

ScieXplore: International Journal of Research in Science

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The present work deals with the photocatalytic degradation as a method for pre-treatment of the effluent from a textile industry containing various dyes and their intermediates which are non-biodegradable. The textile effluent was subjected to photocatalytic degradation under UV irradiation in the presence of TiO 2 as catalyst and the process parameters for maximum degradation were determined. Optimisation of catalyst dose and pH was carried out and the effect of addition of oxidant H 2 O 2 on the degradation efficiency was also studied. The effectiveness with which the photocatalyst can be recycled was also assessed to ensure the economic viability of the process.[8]. Process parameters such as catalyst dose, initial pH etc. were optimised and the effect of addition of H 2 O 2 as oxidant was examined. Results and DiscussionThe treatment of the textile effluent using TiO 2 as photocatalyst under UV irradiation could bring about significant degradation of the pollutants in the effluent as discussed in the subsequent sections.

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TiO2/UV Photodegradation of Azo Dyes in Aqueous Solutions

Cited by 18 publications

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Photodegradation of Commercial Dye 920 DB2 Using TiO2

Photodegradation of Commercial Dye 920 DB2 Using TiO2

Multivariate approach to hydrogenated TiO₂ photocatalytic activity under visible light

Heterogeneous Photocatalytic Treatment of Textile Effluent using Semiconductor Oxide under UV Irradiation

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TiO2/UV Photodegradation of Azo Dyes in Aqueous Solutions

Cited by 18 publications

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Photodegradation of Commercial Dye 920 DB2 Using TiO2

Photodegradation of Commercial Dye 920 DB2 Using TiO2

Multivariate approach to hydrogenated TiO2 photocatalytic activity under visible light

Heterogeneous Photocatalytic Treatment of Textile Effluent using Semiconductor Oxide under UV Irradiation

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Multivariate approach to hydrogenated TiO₂ photocatalytic activity under visible light