Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

Safni, Safni; Jamarun, Novesar; Septiani, Upita; Kim, Moon-Kyung; Zoh, Kyung-Duk

doi:10.21608/ejchem.2019.14543.1883

Cited by 12 publications

(17 citation statements)

References 30 publications

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“…The first step is the zero-order decolorization of azo dye bonds (R 1 ─N=N─R 2 ), probably by direct hole oxidation (0–60 min) since this is the thermodynamic and electrochemical facile pathway [ 24 ]. The second step (k 2 ) is the first-order mineralization (60–120 min) of the intermediates (benzenesulfonic acid; 4-hydrazinylaniline; phenyl diazene) by reactive radicals (•OH; O 2 •─ ) [ 25 ]. The k 1 values are in excellent agreement with the correlation coefficients (R 2 ) regarding the MO conversion values after 1 h of visible light irradiation.…”

Section: Resultsmentioning

confidence: 99%

Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor

et al. 2022

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The widespread use of Ag3PO4 is not surprising when considering its higher photostability compared to other silver-based materials. The present work deals with the facile precipitation method of silver phosphate. The effects of four different phosphate sources (H3PO4, NaH2PO4, Na2HPO4, Na3PO4·12 H2O) and two different initial concentrations (0.1 M and 0.2 M) were investigated. As the basicity of different phosphate sources influences the purity of Ag3PO4, different products were obtained. Using H3PO4 did not lead to the formation of Ag3PO4, while applying NaH2PO4 resulted in Ag3PO4 and a low amount of pyrophosphate. The morphological and structural properties of the obtained samples were studied by X-ray diffractometry, diffuse reflectance spectroscopy, scanning electron microscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity of the materials and the corresponding reaction kinetics were evaluated by the degradation of methyl orange (MO) under visible light. Their stability was investigated by reusability tests, photoluminescence measurements, and the recharacterization after degradation. The effect of as-deposited Ag nanoparticles was also highlighted on the photostability and the reusability of Ag3PO4. Although the deposited Ag nanoparticles suppressed the formation of holes and reduced the degradation of methyl orange, they did not reduce the performance of the photocatalyst.

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Section: Resultsmentioning

confidence: 99%

Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor

et al. 2022

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“…These species are altered in potential power to decolorize and disintegrate any organic colored materials. Hydroxyl radical is a more active species in an aqueous solution with 2.8 V, hence it acts as a powerful oxidant to attack the dye molecules [53][54][55][56][57][58][59][60]. The suggested chlorazol black BH decolorization was displayed in figure.12 that mention in reference [17].…”

Section: E Suggested Mechanismmentioning

confidence: 99%

One-Step Hydrothermal Synthesis of α- MoO3 Nano-belts with Ultrasonic Assist for incorporating TiO2 as a NanoComposite

Obaid

Ahmed

2021

Egypt. J. Chem.

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One of the goals of this project was to utilize the hydrothermal method in preparation of α-MoO3 nano-belts as bluish power at 180 o C for 5h. This nanomaterial was incorporated with rutile-TiO2 to produce a nanocomposite photocatalyst by a direct ultrasonic method in a ratio of 0.25(α-MoO3): 9.75(TiO2) as w/w ratio. The characterized of samples found by X-ray diffraction(XRD), scan electron microscopy(SEM), and ultraviolet-visible spectrophotometry. The XRD analysis and SEM image for prepared α-MoO3 are proved the α-MoO3 is prepared as a nano-belts, but its composite is being as spherical with elevated if roughness of its surface after incorporation. The bandgap of α-MoO3 nanobelts increased from 2.8 eV to 2.95 eV after fabrication it surfaces with rutile-TiO2 that attitude to the small Mo 6+ ion incorporated with Ti 4+ of TiO2 matrix and both ions have a coordination number equal to 6 that enhanced this incorporation. XRD data indicated to all samples are having a nanosize, but SEM analysis proved all samples are polycrystals. The photocatalytic efficiency and the quantum yield for Chlorazol black BH dye decolorization using α-MoO3 nano-belts were investigated under UV-A light and observed it elevated with using its nanocomposite. That is due to elevating the acidity of α-MoO3 nano-belts surface after incorporating it in a rutile-TiO2 crystal lattice, which decreases the recombination and increases the generalization of hydroxyl radical. The photoreaction for using α-MoO3 nano-belts and its composite obeyed pseudo-first-order kinetics.

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“…and then produces a peroxide radical HOO ., the last species can be reacted with hydrogen ion in an aqueous solution and produces hydrogen peroxide. Hydrogen peroxide in the presence of light will split to double hydroxyl radicals ions [61][62][63][64][65]. The most acceptance mechanism for decolorization of carmoisine was suggested in figure 8 [10].…”

Section: Mechanism Of Photocatalytic Decolorization Of Carmoisine Dyementioning

confidence: 99%

Synergistic Effect of dark and photoreactions on the removal and photo-decolorization of azo carmosine dye (E122) as food dye using Rutile- TiO2 suspension

et al. 2021

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Dark and photoreactions have been employed to handle the various hazardous organic water contaminants as Synergistic technologies. The removal (dark reaction) and the photo-decolorization ( photoreaction) of azo carmosine dye (E122) as a food dye in an aqueous solution using Rutile-TiO2 and UV-A light were investigated in this work. Various parameters such as oxidant agents and temperature were determined. In dark reaction, the adsorption capacity and percentage of carmoisine dye removal elevated with the depressing of the temperature. This dark reaction of carmoisne dye is exothermic, physical adsorption, less random, non-spontaneous, and quick response with low activation energy. The maximum value removal % is reached to 86 % when addition mixing of Fe(II) and H2O2 to dye solution. In photoreaction, the same oxidant agents were applied in the dye solution and found the reaction is a pseudo-first-order kinetic, exothermic reaction, fast (low activation energies), less random, and spontaneous. The maximum percentage of decolorization with the addition of mixing of Fe(II) and H2O2 equal to 64.28% at 30 min.

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Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

Cited by 12 publications

References 30 publications

Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor

Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor

One-Step Hydrothermal Synthesis of α- MoO3 Nano-belts with Ultrasonic Assist for incorporating TiO2 as a NanoComposite

Synergistic Effect of dark and photoreactions on the removal and photo-decolorization of azo carmosine dye (E122) as food dye using Rutile- TiO2 suspension

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