The photocatalytic degradation kinetics of food dye in aqueous solution under UV/ZnO system

Brahim, Insaf Ould; Belmedani, Mohamed; Hadoun, Hocine; Belgacem, Ahmed

doi:10.1007/s11144-021-02006-8

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…An experiment was conducted at five different initial dye concentrations of malachite green, ranging from 10ppm to 50ppm. The experimental results showed that the photocatalytic degradation fitted the Langmuir-Hinshelwood kinetics model [22].…”

Section: Kinetics Of Photocatalytic Degradation Of Malachite Green Dyementioning

confidence: 88%

Integrated Adsorption and Photocatalytic Degradation of Malachite Green Using Carbon Based Nanocomposites (ZnO-AC)

Lee

Mokhtar

Hasan

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Malachite green dye is widely used in dye industries, aquaculture industries and food industries. The prevalence of this malachite green in the effluent of wastewater could potentially harm human health and destroy the aquatic system. Hence, to completely destroy its presence in the effluent, a technique of integrated adsorption and photocatalytic degradation was introduced. Integrated photocatalyst adsorbent (IPCA) utilizing zinc oxide as photocatalyst and supported on activated carbon derived from melinjo shell, ZnO-AC was synthesized. Activated carbon derived from the melinjo shell provides a porous surface for adsorption while zinc oxide is sensitive to photons and enhances better light absorption. ZnO-AC was subjected to scanning electron microscope (SEM) and Fourier Transform infrared spectroscopy (FTIR) characterization. The analysis revealed a porous sponge network and an intense peak of zinc oxide at 650-700 cm−1. The performance of ZnO-AC was evaluated by studying the effect of initial dye concentration (10-50 ppm), pH (2-11) and ZnO-AC dosage (5-25 mg) in the presence of UV light. In this study, the optimum conditions for dye degradation were found to be 10 ppm initial dye concentration, pH 11 and 15 mg ZnO-AC dosage. Kinetic behaviour of the dye degradation was also investigated. The photocatalytic degradation followed Langmuir-Hinshelwood model and the data corresponded well with pseudo-first-order kinetics.

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Section: Kinetics Of Photocatalytic Degradation Of Malachite Green Dyementioning

confidence: 88%

Integrated Adsorption and Photocatalytic Degradation of Malachite Green Using Carbon Based Nanocomposites (ZnO-AC)

Lee

Mokhtar

Hasan

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The Langmuir‐Hinshelwood (L‐H) kinetic model was chosen as the fifth model that considers a heterogeneous system with complete miscibility between reagents and a heterogeneous catalyst with active homogeneous sites. The L‐H model is frequently used for photocatalysis with nanoparticles [17,76–83] …”

Section: Methodsmentioning

confidence: 99%

“…The L-H model is frequently used for photocatalysis with nanoparticles. [17,[76][77][78][79][80][81][82][83] Mathematical modelling was performed using the Matlab® software package and the results were evaluated by R 2 , SD, pvalue, and F-test. The parameters from the model with the best accuracy were subsequently used to obtain the thermodynamic properties.…”

Section: Kinetics and Thermodynamic Parametersmentioning

confidence: 99%

Methyl Oleate Synthesis by TiO₂Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

et al. 2022

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Methyl oleate, an example of a FAME (fatty acid methyl ester), was produced by oleic acid (OA) photoesterification with TiO2 and UVA light. Different parameters were evaluated and optimised: catalyst pretreatment, temperature (25–65 °C), catalyst loading (1–30 % w/wOA) and oleic acid : alcohol molar ratio (1 : 3–1 : 55). Response surface quadratic methodology obtained by central composite rotational design (RSM‐CCRD) was used to evaluate the main operational conditions of the photoesterification process. A high conversion of 98 % (±0.8) at 55 °C, 20 % TiO2 (w/wOA), and 1(OA) : 55(methanol) molar ratio was achieved. The photoesterification mechanism is furthermore proposed. The Langmuir‐Hinshelwood kinetic model considered the forward and backward reaction as first‐order fits with the best accuracy (R2 of 0.997). The thermodynamic results (ΔG338.15K=−20.75 kJ/mol, ΔH=13.75 kJ/mol, and ΔS=0.47 kJ/mol.K) indicate that the operating conditions are important, both to supply the energy requirement of the reaction, but also to increase the miscibility of the reactants.

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“…To describe the kinetics of TC degradation, we were inspired by the results reported in the literature. The photodegradation kinetics are described by first and second order models [30,[45][46][47][48][49][50]:…”

Section: Kinetic Measurementmentioning

confidence: 99%

Kinetic and mechanism studies of tetracycline photodegradation using synthesized ZnAl2O4

Hemmi

Belmedani

Mekatel

et al. 2021

Reac Kinet Mech Cat

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In this study, we report the photodegradation of a pharmaceutical pollutant namely the tetracycline (TC) onto the spinel ZnAl 2 O 4 . The semiconductor ZnAl 2 O 4 was synthesized by chemical route and characterized by X-ray diffraction, scanning electron microscopy and optical analysis. The capacitance potential (C −2 -E) measurements showed that the oxide exhibit n-type conduction, supported by a negative thermopower. The degradation of TC was performed by combined adsorption/photocatalysis processes. The result showed that 30 min of contact time was sufficient to reach 42% of the adsorption capacity; the photodegradation rate of TC was evaluated on ZnAl 2 O 4 under optimal operating parameters pH ~ 4.4, catalyst dose (1 g/L), and initial TC concentration (20 mg/L). The kinetic shows that the TC disappears almost completely (92%) and follows a second order model with a half photocatalytic lifetime of 21 min for a TC concentration of 20 mg/L. The mechanism of the antibiotic tetracycline photodegradation on ZnAl 2 O 4 indicated that the O ⋅− 2 radicals and the holes are mainly responsible for the oxidation of TC. The process can be qualified as clean remediation and is a part of a sustainable development perspective.

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The photocatalytic degradation kinetics of food dye in aqueous solution under UV/ZnO system

Cited by 7 publications

References 28 publications

Integrated Adsorption and Photocatalytic Degradation of Malachite Green Using Carbon Based Nanocomposites (ZnO-AC)

Integrated Adsorption and Photocatalytic Degradation of Malachite Green Using Carbon Based Nanocomposites (ZnO-AC)

Methyl Oleate Synthesis by TiO₂Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

Kinetic and mechanism studies of tetracycline photodegradation using synthesized ZnAl2O4

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The photocatalytic degradation kinetics of food dye in aqueous solution under UV/ZnO system

Cited by 7 publications

References 28 publications

Integrated Adsorption and Photocatalytic Degradation of Malachite Green Using Carbon Based Nanocomposites (ZnO-AC)

Integrated Adsorption and Photocatalytic Degradation of Malachite Green Using Carbon Based Nanocomposites (ZnO-AC)

Methyl Oleate Synthesis by TiO2Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

Kinetic and mechanism studies of tetracycline photodegradation using synthesized ZnAl2O4

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Methyl Oleate Synthesis by TiO₂Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics