Photo-Decolourization Kinetics of Acid Red 87 Dye in ZnO Suspension Under Different Types of UV-A Light

Ahmed, Luma Majeed

doi:10.14233/ajchem.2018.21520

Cited by 18 publications

(10 citation statements)

References 18 publications

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“…The ΔG # and ΔH # have positive values, that can be interpenetrated as increment in solvated of the transition state between formed hydroxyl radicals and RY 14 dye or RG dye [34,36]. These up mentioned results are noticed in a good agreement with the previous published in references [8,19,[37][38][39].…”

Section: 15supporting

confidence: 90%

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Kinetic Study for Reduced the Toxicity of Textile Dyes (Reactive yellow 14 dye and Reactive green dye) Using UV-A light/ZnO System

et al. 2020

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S EVERAL parameters have been studied in this manuscript to investigate the effect of certain conditions on the removal and the decolorization of the textile dyes: reactive yellow 14 (RY 14) and reactive green (RG) dyes from aqueous solution. Parameters such as temperature, initial concentration of dye and initial pH were taken into consideration to reach the perfect removal and decolorization for both dyes. This work was achieved in both dark and photoreaction processes. In dark reaction, the type of adsorption was determined based on Gibb's free energy values, activation energies and change in enthalpies, which were found that the physical adsorption for removal of both dyes is predominated, and the reaction is exothermic. The adsorption capacity and percentage of removal both dyes elevated with raised the dye concentration. The best initial pH for removal of RY 14 and RG dyes dyes was conducted and found equal to 5.14 and 9.75 respectively. The raised in temperature is not enhanced the adsorption process, that due to the dark reaction for both dye is exothermic. The small negative values of change in entropies are proved the associative mechanism of both dyes on ZnO surface. On the other hand, the results under the percent UV-light showed, that the optimal conditions were found at 303.15 K, with 25 ppm and optimum pH=11.01 for reactive green(RG) dye, while the optimum conditions were appearing at 50 ppm and best pH= 6.075 for reactive yellow 14 at same temperature. The decolorization process for both studied dyes was found to be a pseudo-first-order kinetic, fast (low activation energies), endothermic reaction (positive change in enthalpies), non-spontaneous (positive change Gibbs free energies) and less random (negative change in entropies). The photoreaction is a completed to removal process to depress the toxicity for these studied textiles dyes.

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Section: 15supporting

confidence: 90%

“…The essential principle for this mechanism is depended upon formed (e --h + ) pair, when the UV-A-light focused on suspension solution of ZnO [37,40]. The adsorbed dyes on ZnO surface are suffered to attract by hydroxyl radicals.…”

Section: Suggested Mechanism Of Photodecolorization Of Rg Dye and Ry1mentioning

confidence: 99%

Kinetic Study for Reduced the Toxicity of Textile Dyes (Reactive yellow 14 dye and Reactive green dye) Using UV-A light/ZnO System

et al. 2020

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“…At the low concentration of studied dye, the Langmuir-Hinshelwood kinetic expression was utilized to determine the rate constant (kapp.) for this photoreaction and the efficiency of photodecolorization percentage (E %), as expressed by the following equations [30][31].…”

Section: Photocatalytic Activity For Zns and Zns-cds Nanocompositementioning

confidence: 99%

Incorporation CdS with ZnS as Composite and Using in Photo-Decolorization of Congo Red Dye

Fakhri

Ahmed

2019

Indones. J. Chem.

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The aim of this manuscript was to modify the ZnS surface by incorporating with CdS photocatalyst. This manner led to depressing the recombination process and increasing the activity. The X-ray Powder Diffraction (XRD) data were proved that the CdS incorporated with ZnS and formed ZnS-CdS nanocomposite by observing new peaks at 26.92, 28.62, 30.52, and 47.26°. Based on the Atomic Force Microscopy (AFM) analysis and Tauc equation, the particle sizes for all samples were raised with decreased the band gap values. The activation energy for decolorization of Congo red with the using ZnS is found to be more than that value for the using prepared ZnS-CdS composite. The percentage of efficiency was found to be increased with modified the ZnS surface.

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“…where Ea is activation energy, k is rate constant, R is gas constant, T is the temperature of reaction and A is a frequency constant. ΔH # and ΔS # were calculated based on the Eyring-Polanyi equation [25,[30][31]…”

Section: Effect Of Temperature On the Decolorization Of [Co2(opd)2(l)mentioning

confidence: 99%

“…ΔG # of the photo reaction was calculated using the Gibbs equation (Eq. (9)) based on the fitting results of the Eyring-Polanyi equation [29][30][31].…”

Section: Effect Of Temperature On the Decolorization Of [Co2(opd)2(l)mentioning

confidence: 99%

Preparation, Characterization and Study of the Photodecolorization of Mixed-Ligand Binuclear Co(II) Complex of Schiff Base by ZnO

et al. 2020

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In this work, a new mixed-ligand binuclear Co(II) complex of Schiff base was prepared. Moreover, the characterization of this prepared complex was performed by measurement of melting points, UV-Vis spectra, FT-IR spectra, and magnetic susceptibility measurements, and later compared with metal and ligand solutions. It has been discovered that the Schiff bases with Co(II) ion forms a binuclear complex with a stoichiometry of molar ratio 1:2 from "metal:ligand". The photodecolorization of this complex was done under UV light for ZnO's suspension solution. The results of this photodecolorization showed that the greatest efficiency was obtained with the use of ZnO dose of 300 mg/100 mL and at an initial pH of 7. The decolorization activation energy for this complex is a small value of 11.289 kJ mol -1 . Additionally, the thermodynamic study for this reaction is non-spontaneous, endothermic and less random.

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Photo-Decolourization Kinetics of Acid Red 87 Dye in ZnO Suspension Under Different Types of UV-A Light

Cited by 18 publications

References 18 publications

Kinetic Study for Reduced the Toxicity of Textile Dyes (Reactive yellow 14 dye and Reactive green dye) Using UV-A light/ZnO System

Kinetic Study for Reduced the Toxicity of Textile Dyes (Reactive yellow 14 dye and Reactive green dye) Using UV-A light/ZnO System

Incorporation CdS with ZnS as Composite and Using in Photo-Decolorization of Congo Red Dye

Preparation, Characterization and Study of the Photodecolorization of Mixed-Ligand Binuclear Co(II) Complex of Schiff Base by ZnO

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