A Novel Kinetic Approach for Photocatalytic Degradation of Azo Dye with CdS and Ag/CdS Nanoparticles Fixed on a Cement Bed in a Continuous‐Flow Photoreactor

Fard, Narges Elmi; Fazaeli, Reza

doi:10.1002/kin.21025

Cited by 23 publications

(13 citation statements)

References 44 publications

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“…The reaction rate was calculated as follows (Equations and ):

- r_{A} = - \frac{dC}{dt} = \frac{K_{add}^{app} k_{LH} C}{1 + K_{add}^{app} C}

\frac{1}{K} = \frac{1}{K_{add}^{app} k_{LH}} + \frac{C_{0}}{k_{italicLH}}

where, r A is the rate of photocatalytic reaction (mg/L min), C 0 is the initial pollutant concentration, K is the rate constant of first‐order reaction (min −1 ),

K_{add}^{app}

is the apparent Langmuir adsorption constant, and k LH is the Langmuir–Hinshelwood rate constant .…”

Section: Resultsmentioning

confidence: 99%

Structural, Optical, and Isothermic Studies of CuFe₂O₄ and Zn‐Doped CuFe₂O₄ Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Kar

Fazaeli

Manteghi

et al. 2019

Env Prog and Sustain Energy

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Cu and Zn‐doped Cu ferrites were synthesized by sol–gel auto‐combustion method. The samples were characterized by XRD, SEM, EDX, VSM, FT‐IR, and DRS methods. Powder XRD analysis and FT‐IR spectroscopy confirmed the formation of ferrites spinel phase. The crystallite sizes were calculated using Scherrer's equation. The morphologies and sizes of the synthesized nanoparticles have been observed by scanning electron microscopy. The saturation magnetization (MS) is obtained from VSM data. The energy band gaps were calculated from UV–DRS absorption data. Removal of Direct Red 264 was carried out by CuFe2O4 and Zn‐doped CuFe2O4 as catalysts under a visible lamp. The kinetic and isothermic analysis of photocatalytic degradation was studied. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13109, 2019

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“…The reaction rate was calculated as follows (Equations and ):

- r_{A} = - \frac{dC}{dt} = \frac{K_{add}^{app} k_{LH} C}{1 + K_{add}^{app} C}

\frac{1}{K} = \frac{1}{K_{add}^{app} k_{LH}} + \frac{C_{0}}{k_{italicLH}}

where, r A is the rate of photocatalytic reaction (mg/L min), C 0 is the initial pollutant concentration, K is the rate constant of first‐order reaction (min −1 ),

K_{add}^{app}

is the apparent Langmuir adsorption constant, and k LH is the Langmuir–Hinshelwood rate constant .…”

Section: Resultsmentioning

confidence: 99%

Structural, Optical, and Isothermic Studies of CuFe₂O₄ and Zn‐Doped CuFe₂O₄ Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Kar

Fazaeli

Manteghi

et al. 2019

Env Prog and Sustain Energy

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“…The reaction rate was calculated as follow (Equations and ):

- r_{A} = - \frac{dC}{dt} = \frac{K_{add}^{app} k_{L . H .} C}{1 + K_{add}^{app} C}

\frac{1}{K} = \frac{1}{K_{add}^{app} k_{L . H .}} + \frac{C_{0}}{k_{L . H .}}

where, r A is the rate of photocatalytic reaction (mg/L min), C 0 is the initial pollutant concentration, K is the rate constant of first‐order reaction (min −1 ),

K_{add}^{app}

is the apparent Langmuir adsorption constant, and k L.H . is the Langmuir–Hinshelwood rate constant .…”

Section: Resultsmentioning

confidence: 99%

“…In this model, the organic substrates adsorbed on the catalyst. This model has two hypotheses: the first one is the Langmuir isotherm and the second one is that the chemical reaction happens on the catalyst surface after adsorption .…”

Section: Introductionmentioning

confidence: 99%

Elimination of direct red 264 using magnetic pure and Zn‐doped NiFe₂O₄ nanophotocatalysts under visible light irradiation: Isothermic and kinetic studies

Kar

Fazaeli

Manteghi

et al. 2019

Env Prog and Sustain Energy

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Photocatalytic degradation of direct red 264 under visible light using NiFe2O4 and Zn‐doped NiFe2O4 nanoparticles was the primary goal of this work. Hence, NiFe2O4 and Zn‐doped NiFe2O4 nanoparticles were prepared by the sol–gel auto combustion method. The powder X‐ray diffraction pattern unveiled the formation of spinel phase of NiFe2O4 with the average crystallite size determined from the Scherrer equation. The FTIR spectra of the samples revealed the vibration bands of Fe–O and Ni–O. The morphology and size of the synthesized nanoparticles have been observed by scanning electron microscopy. The band gap calculated using Kubelka–Munk function from the UV–visible diffuse reflectance spectra. Finally, removal of azo dye and corresponding kinetic and isothermic studies was examined. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13097, 2019

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“…In Equation 2, k 1 is the pseudo-first-order rate constant. Pseudo steady-state approximation, in which the concentration of hydroxyl radicals (OH•) does not change with the reaction time, is commonly used (Kumoro et al, 2017;Rajchel-Mieldzioć et al, 2020;Fard et al, 2016;El-Dein et al, 2003). This approach has been widely used to eliminate the nonmeasurable radicals concentration, correlating it as a function of H 2 O 2 concentration (Neamtu et al, 2002;El-Dein et al, 2003).…”

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confidence: 99%

Experimental and Theoretical Aspects of Azo Dye Degradation by UV/H2O2 Process: Review and experimental comparison of some kinetic rate expressions

Savun-Hekimoğlu¹

2020

International Journal of Environment and Geoinformatics

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Due to their unique properties, azo dyes are extensively used, especially in the textile industry. Due to their low biodegradability, these compounds cannot be treated in wastewater treatment plants and discharges of these effluents poses a serious threat to the receiving water bodies. In the literature, several advanced oxidation processes have been studied for decolorization and mineralization of these toxic compounds. Among these advanced oxidation processes, the UV/H 2 O 2 process has attracted great attention with its high efficiency in removing these compounds. The goal of this paper is to review the kinetic rate expressions developed to describe azo dye degradation by UV/H 2 O 2 process. A detailed review of pseudo-first-order reaction mechanism, as well as reactor design models, is provided. Finally, a set of experiments are conducted with Reactive Black 5 to compare the model estimations with the observed data. In addition, a regression model is developed using response surface methodology to optimize operating conditions. The experimental results indicate that the optimum pH value that gives the maximum reaction constant is 5.74. Moreover, initial dye concentration is found to be a more significant parameter for decay rate constant than pH value. The open questions and future research topics are also discussed.

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A Novel Kinetic Approach for Photocatalytic Degradation of Azo Dye with CdS and Ag/CdS Nanoparticles Fixed on a Cement Bed in a Continuous‐Flow Photoreactor

Cited by 23 publications

References 44 publications

Structural, Optical, and Isothermic Studies of CuFe₂O₄ and Zn‐Doped CuFe₂O₄ Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Structural, Optical, and Isothermic Studies of CuFe₂O₄ and Zn‐Doped CuFe₂O₄ Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Elimination of direct red 264 using magnetic pure and Zn‐doped NiFe₂O₄ nanophotocatalysts under visible light irradiation: Isothermic and kinetic studies

Experimental and Theoretical Aspects of Azo Dye Degradation by UV/H2O2 Process: Review and experimental comparison of some kinetic rate expressions

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A Novel Kinetic Approach for Photocatalytic Degradation of Azo Dye with CdS and Ag/CdS Nanoparticles Fixed on a Cement Bed in a Continuous‐Flow Photoreactor

Cited by 23 publications

References 44 publications

Structural, Optical, and Isothermic Studies of CuFe2O4 and Zn‐Doped CuFe2O4 Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Structural, Optical, and Isothermic Studies of CuFe2O4 and Zn‐Doped CuFe2O4 Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Elimination of direct red 264 using magnetic pure and Zn‐doped NiFe2O4 nanophotocatalysts under visible light irradiation: Isothermic and kinetic studies

Experimental and Theoretical Aspects of Azo Dye Degradation by UV/H2O2 Process: Review and experimental comparison of some kinetic rate expressions

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Structural, Optical, and Isothermic Studies of CuFe₂O₄ and Zn‐Doped CuFe₂O₄ Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Structural, Optical, and Isothermic Studies of CuFe₂O₄ and Zn‐Doped CuFe₂O₄ Nanoferrite as a Magnetic Catalyst for Photocatalytic Degradation of Direct Red 264 Under Visible Light Irradiation

Elimination of direct red 264 using magnetic pure and Zn‐doped NiFe₂O₄ nanophotocatalysts under visible light irradiation: Isothermic and kinetic studies