Kinetic and thermodynamic studies of fenton oxidative decolorization of methylene blue

Giwa, Abdur-Rahim Adebisi; Bello, Isah Adewale; Olabintan, Abdullahi Biodun; Bello, Olugbenga Solomon; Saleh, Tawfik A.

doi:10.1016/j.heliyon.2020.e04454

Cited by 63 publications

(46 citation statements)

References 33 publications

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“…The data obtained from the decolorization of AO8 and MB as a function of time were analyzed and found to fit well to the pseudo-first-order kinetics. These results are in good agreement with previous studies on the degradation of organic pollutants [ 47 , 48 , 49 ]. In Table 3 , a summary of the obtained decolorization yields plus the kinetic constants is presented with their respective correlation coefficients.…”

Section: Resultssupporting

confidence: 93%

Engineering Iron Oxide Nanocatalysts by a Microwave-Assisted Polyol Method for the Magnetically Induced Degradation of Organic Pollutants

Gallo-Córdova

Veintemillas-Verdaguer

Tartaj

et al. 2021

Nanomaterials

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Advanced oxidation processes constitute a promising alternative for the treatment of wastewater containing organic pollutants. Still, the lack of cost-effective processes has hampered the widespread use of these methodologies. Iron oxide magnetic nanoparticles stand as a great alternative since they can be engineered by different reproducible and scalable methods. The present study consists of the synthesis of single-core and multicore magnetic iron oxide nanoparticles by the microwave-assisted polyol method and their use as self-heating catalysts for the degradation of an anionic (acid orange 8) and a cationic dye (methylene blue). Decolorization of these dyes was successfully improved by subjecting the catalyst to an alternating magnetic field (AMF, 16 kA/m, 200 kHz). The sudden temperature increase at the surface of the catalyst led to an intensification of 10% in the decolorization yields using 1 g/L of catalyst, 0.3 M H2O2 and 500 ppm of dye. Full decolorization was achieved at 90 °C, but iron leaching (40 ppm) was detected at this temperature leading to a homogeneous Fenton process. Multicore nanoparticles showed higher degradation rates and 100% efficiencies in four reusability cycles under the AMF. The improvement of this process with AMF is a step forward into more sustainable remediation techniques.

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Section: Resultssupporting

confidence: 93%

Engineering Iron Oxide Nanocatalysts by a Microwave-Assisted Polyol Method for the Magnetically Induced Degradation of Organic Pollutants

Gallo-Córdova

Veintemillas-Verdaguer

Tartaj

et al. 2021

Nanomaterials

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“…After these periods degradation process exhibits a slower rate and reaches equilibrium and maximum removal about 95% after 60 min and 120 min for concentrations 40 and 80 mg/l respectively [33].…”

Section: Kinetic Studiesmentioning

confidence: 99%

Kinetic and thermodynamic studies of the degradation of methylene blue by photo-Fenton reaction

Raheb

Manlla

2021

Heliyon

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Syrian natural magnetite has been utilized for the removal of methylene blue from aqueous solutions by photo-Fenton reaction. Experiments were carried out to evaluate the kinetic and thermodynamic parameters.Pseudo-first order, pseudo-second-order models were used to analyze the kinetic data obtained at different initial MB concentrations and temperatures.The photo-Fenton degradation process of MB is better described by the pseudo-first-order model. The activation energy Ea ¼ 16.89 and 18.02 kJ/mol for MB degradation at concentrations 40 and 80 mg/l respectively, and that suggesting the degradation reaction proceeded with a low energy barrier, the values obtained (ΔG*, ΔS*, and ΔH*) indicate that the process is endothermic and spontaneous.

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“…In this concentration range, 98% decolorization is achieved after less than 10 min. For higher H 2 O 2 concentrations, MG degradation rate decreases leading to 99%, 98%, and 88% decolorization for 5, 10 and 50 mM, respectively, after 1 h. An optimal H 2 O 2 concentration has already been reported in the Fenton oxidation of dyes [ 42 , 43 ]. Indeed, for high concentrations, H 2 O 2 excess acts as a scavenger of hydroxyl radical ( • OH), resulting in less dye degradation.…”

Section: Resultsmentioning

confidence: 95%

A Novel Energy-from-Waste Approach for Electrical Energy Production by Galvano–Fenton Process

et al. 2021

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A novel approach allowing the production of electrical energy by an advanced oxidation process is proposed to eliminate organic micropollutants (MPs) in wastewaters. This approach is based on associating the Galvano–Fenton process to the generation of electrical power. In the previous studies describing the Galvano–Fenton (GF) process, iron was directly coupled to a metal of more positive potential to ensure degradation of organic pollutants without any possibility of producing electrical energy. In this new approach, the Galvano–Fenton process is constructed as an electrochemical cell with an external circuit allowing recovering electrons exchanged during the process. In this study, Malachite Green (MG) dye was used as a model of organic pollutant. Simultaneous MG degradation and electrical energy production with the GF method were investigated in batch process. The investigation of various design parameters emphasis that utilization of copper as a low-cost cathode material in the galvanic couple, provides the best treatment and electrical production performances. Moreover, these performances are improved by increasing the surface area of the cathode. The present work reveals that the GF process has a potential to provide an electrical power density of about 200 W m−2. These interesting performances indicate that this novel Energy-from-Waste strategy of the GF process could serve as an ecological solution for wastewater treatment.

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Kinetic and thermodynamic studies of fenton oxidative decolorization of methylene blue

Cited by 63 publications

References 33 publications

Engineering Iron Oxide Nanocatalysts by a Microwave-Assisted Polyol Method for the Magnetically Induced Degradation of Organic Pollutants

Engineering Iron Oxide Nanocatalysts by a Microwave-Assisted Polyol Method for the Magnetically Induced Degradation of Organic Pollutants

Kinetic and thermodynamic studies of the degradation of methylene blue by photo-Fenton reaction

A Novel Energy-from-Waste Approach for Electrical Energy Production by Galvano–Fenton Process

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