Photocatalytic oxidation of methyl orange in presence of titanium dioxide in aqueous suspension. Part II: kinetics study

Guettai, Nadia; Amar, H. Aït

doi:10.1016/j.desal.2005.04.049

Cited by 167 publications

(89 citation statements)

References 20 publications

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“…(2) The values of the kinetic constants obtained for the different photocatalytic runs (Figure 7) are of same order of magnitude for various photocatalytic reactions. [17][18][19][20][25][26][27] Moreover, it is evident that the experimental data obtained for the TiO 2 porous films (PEG-modified films) has good correlation with the exponential function for the pseudo first-order reaction (R 2 > 0.99); whereas for the unmodified film (with low porosity) and the photolysis assay, the data has a better fit with zero-order kinetics, in which the reaction rate is independent of the colorant concentration. In these two assays, the diffusion of reactants does not control the reaction, and for the photocatalytic assay, stirring the solution is sufficient to keep the surface saturated with reactants.…”

Section: Photocatalytic Evaluation Of Films Regarding Methyl Orange Omentioning

confidence: 99%

“…Currently, it is widely used because of the amount of information available in the literature and the technical ease involved in the tracing or screening of the reactive concentration over time. [16][17][18] In this study, a simple methodology for the preparation of porous thin films supported on glass slides was developed, using PEG as a polymeric additive. The multilayered films were characterized using the following techniques: thermogravimetric analysis (TGA-DTG), X-ray diffraction (XRD), UV-Vis spectroscopy and scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photocatalytic activity of TiO2 films by modification with polyethylene glycol

Ramírez‐Santos¹,

Acevedo–Peña²,

Córdoba³

2012

Quím. Nova

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Recebido em 15/1/12; aceito em 22/6/12; publicado na web em 18/9/12 Titanium dioxide porous thin films on the Anatase phase were deposited onto glass slides by the sol-gel method assisted with polyethylene glycol (PEG). The dip-coated films were characterized using scanning electron microscopy (SEM), thermogravimetric analysis (TGA and DTG), UV-visible spectroscopy and X-ray diffraction (XRD). The photocatalytic activity of the films was determined by means of methyl-orange oxidation tests. The resultant PEG-modified films were crack-free and developed a porous structure after calcination at 500 °C. Photo-oxidation tests showed the dependency of catalytic activity of the films on the number of layers (thickness) and porosity, i.e. of the interfacial area.

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Section: Photocatalytic Evaluation Of Films Regarding Methyl Orange Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of TiO2 films by modification with polyethylene glycol

Ramírez‐Santos¹,

Acevedo–Peña²,

Córdoba³

2012

Quím. Nova

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“…The direct release of these complex dyes and their products to the environment may cause serious problems. The biodegradation of dyes in the aquatic ecosystem take a long time, and therefore can cause dramatic consequences such as esthetic pollution, and perturbations in aquatic life [1].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Decolorization Study of Methyl Orange by TiO<sub>2</sub>–Chitosan Nanocomposites

Fajriati¹,

Mudasir²,

Wahyuni³

2014

Indones. J. Chem.

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The photocatalytic decolorization of methyl orange (MO) ABSTRAK Telah dilakukan studi reaksi dekolorisasi metil orange (MO) terkatalisis nanokomposit TiO 2 -kitosan. Studi diawali dengan sintesis nanokomposit TiO 2 -kitosan menggunakan metode sol gel dengan variasi konsentrasi titanium (IV) isopropoksida (TTIP) sebagai prekursor. Struktur, morfologi, sifat termal dan optis dikarakterisasi menggunakan X-ray diffraksi (XRD), Fourier transform infra red (FTIR) spektroskopi, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), dan diffuse reflectance ultra violet (DRUV) spektroskopi. Aktivitas fotokatalitik nanokomposit TiO

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“…Though Co:La:TiO 2 shows the good photocatalytic activity than pure TiO 2 for the degradation of Methyl Orange dye. The major photodegradation of methyl orange was observed in 3 hour irradiation time, in the presence of Co:La:TiO 2 [50]. This is due to the doping of La 3+ and Co 2+ ions in TiO 2 , the band gap energy decreased, due to the formation of sub-band by the La 3+ and Co 2+ ions.…”

Section: Effect Of Photocatalyst Amountmentioning

confidence: 87%

“…• OH) and superoxide radical anions (O 2 .-) are the primary oxidizing species in the photocatalytic oxidation processes [50]. These oxidative reactions would results in the degradation of the pollutants as shown in the following equations 4-5;…”

Section: Mechanism Of Photooxidation Processmentioning

confidence: 99%

Photodegradation of Methyl Orange in Aqueous Solution by the Visible Light Active Co:La:TiO2 Nanocomposite

Azad¹,

Gajanan²

2017

Chem Sci J

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In this study, the Co:La:TiO 2 nanocomposite was prepared by the wet chemical method. Synthesized TiO 2 and Co:La:TiO 2 were characterized by X-Ray Diffractometer, SEM, TEM, UV-vis, FT-IR, Band gap energy and BET. The TiO 2 and Co:La:TiO 2 were used as photocatalyst for the degradation of Methyl Blue. The XRD pattern confirmed the presence of anatase and rutile phase in the catalyst. The particle size was estimated by the Scherrer's and found 68 and 32 nm for TiO 2 and Co:La:TiO 2 respectively. The particle morphology of the photocatalysts was found in nanodiamension. The surface area of the photocatalysts was found 37.52 and 106.68 m 2 /g for TiO 2 and Co:La:TiO 2 respectively. The band gap energy of TiO 2 and Co:La:TiO 2 were 3.2 and 3.0 eV. The photodegradation of Methyl Orange has been found 18% and 88% at 5 pH for TiO 2 and Co:La:TiO 2 respectively. The photodegradation of Methyl Orange has been found 19% and 98.9% at 25 ppm concentration of dye. The photodegradation of Methyl Orange has been found 25% and 96% at 800 mg/L amount of photocatalyst and 180 min illumination of visible light. The photodegradation was following the first order kinetics.

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Photocatalytic oxidation of methyl orange in presence of titanium dioxide in aqueous suspension. Part II: kinetics study

Cited by 167 publications

References 20 publications

Enhanced photocatalytic activity of TiO2 films by modification with polyethylene glycol

Enhanced photocatalytic activity of TiO2 films by modification with polyethylene glycol

Photocatalytic Decolorization Study of Methyl Orange by TiO<sub>2</sub>–Chitosan Nanocomposites

Photodegradation of Methyl Orange in Aqueous Solution by the Visible Light Active Co:La:TiO2 Nanocomposite

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