Online monitoring of Fenton‐mediated reactive red 6<scp>B</scp> oxidation kinetics

Abstract:A comprehensive study of the chemical oxidation degradation of diethyl phthalate (DEP) was conducted through Fenton processes. Effects of various operating parameters that considerably affect DEP decomposition were investigated, including solution pH, H 2 O 2 , Fe 2+ , and DEP concentration. The removal efficiency of DEP achieved 98% under reaction conditions of pH value of 3.0, concentration of 0.3 mM of Fe 2+ , and 6.0 mM of H 2 O 2 after 170 min. In general, DEP degradation in Fenton process was found to occur in two stages, with an extremely fast stage and then a slow one, as a result of change of H 2 O 2 and Fe 2+ initial concentration. Based on the pseudo-steady-state hypothesis of hydroxyl radical formed by the Fenton reaction, a kinetic model for DEP degradation has been proposed which describes the effect of decomposition byproducts on the oxidation reaction. The experiment results also were in good agreement with Behnajady-Modirshahla-Ghanbery (BMG) kinetic model. During the degradation process, seven degradation intermediates of DEP were detected out by means of GC/MS, including ethyl 2-hydroxybenzoate, ethyl 3-hydroxybenzoate, phthalic anhydride, benzoic acid ethyl ester, malonic acid, oxalic acid, and acetic acid. Probable degradation pathway of DEP by the Fenton reaction was also proposed. Inhibitory effects of DEP and intermediate products were investigated in aqueous solution with Photobacterium phosphoreum. Findings indicated that the solution was not completely detoxified even if DEP completely disappeared, further post-treatment was recommended. All these observations have significant potential applications and require further investigation.

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“…Finally, as the Fenton process adhered to firstorder kinetics (30)(31)(32), the last term in Eq. (9) (10) is the apparent reaction rate constant.…”

Section: Dep Degradation Kineticsmentioning

confidence: 99%

“…BMG model was derived from Behnajady, Modirsshahla and Ghanbary (33), which effectively predicted degradation of Direct Blue 71, azo dye RR6B and Acid Red 66 by Fenton process (30,34,35). BMG kinetic model could be expressed as follows (30):…”

Section: Dep Degradation Kineticsmentioning

confidence: 99%

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Zhang

Wang

Lei

2016

Journal of Advanced Oxidation Technologies

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“…Data obtained from the experiment were tested using three kinetic models, first order, second order, and BMG kinetic model. Some researchers have reported that the BMG model has effectively predicted degradation of the Fenton process [20,24,34]. By applying the equations in Table 1 below, the three kinetic models at different [H 2 O 2 ] to [COD] ratios during the 15 min Fenton reaction were calculated.…”

Section: Kinetic Of Cod Degradationmentioning

confidence: 99%

“…For Equations (10)-(12), C 0 and Ct are showing COD concentration (mg/L) of sugarcane vinasse at initial (t = 0) and time t (min), respectively; k 1 is first order kinetic parameter (min −1 ); k 2 is second order kinetic parameter (L·mg −1 ·min −1 ); m (min) and b are two characteristic constants of BMG kinetic model which represent the relation between oxidation capacity and reaction kinetics. predicted degradation of the Fenton process [20,24,34]. By applying the equations in Table 1 below, the three kinetic models at different [H2O2] to [COD] ratios during the 15 min Fenton reaction were calculated.…”

Section: Kinetic Model Equationmentioning

confidence: 99%

Decreasing COD in Sugarcane Vinasse Using the Fenton Reaction: The Effect of Processing Parameters

et al. 2019

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An experiment on Fenton degradation of sugarcane vinasse was carried out to determine its effect on the wastewater characteristics. Vinasse, a by-product of distillation in the bioethanol industry, contains high organic matter, as the value of chemical oxygen demand (COD) is >100,000 mg/L and BOD 5 is 31,250 mg/L. The Fenton reaction is one of the advanced oxidation process (AOP) methods which has been widely applied for the treatment of wastewater containing organic pollutants and contaminants. This method utilizes hydroxyl radical ( • OH) produced from the catalyzing reaction between Fe 2+ or Fe 3+ and hydrogen peroxide. The effect of pH, the ratio of [H 2 O 2 ] and [COD], and the ratio of [H 2 O 2 ] to [Fe 3+ ] were studied in this research to evaluate the Fenton reaction. Results from this experiment showed that treatment of vinasse using the Fenton reaction decreased the COD value to 48.10%, and its biodegradability enhanced almost two times at a pH value of 3.8, a ratio of [H 2 O 2 ] to [COD] of 0.62, and a ratio of [H 2 O 2 ] to [Fe 3+ ] of 50 (g/g), which demonstrated that the Fenton treatment was effective to reduce organic matter of sugarcane vinasse. Three kinetic models (first order, second order, and Behnajad-Modirshahla-Ghanbery (BMG) kinetic model) were used to evaluate the degradation of the COD value. On the basis of the value of R 2 (coefficient of determination), we suggested that BMG represented the best kinetic model. This study finds that the Fenton treatment is able to mitigate the environmental impacts of sugarcane vinasse.

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“…is a powerful oxidant (oxidation potential = 2.8 eV) that can effectively degrade organic pollutants such as textile dyes . Various AOPs such as photocatalysis , Fenton oxidation , sonolysis electrochemical oxidation and hybrid processes have been investigated for the treatment of textile effluents.…”

Section: Introductionmentioning

confidence: 99%

Fenton oxidation treatment of recalcitrant dye in fluidized bed reactor: Role of SiO₂ as carrier and its interaction with fenton's reagent

Bello

Raman

Asghar

2019

Env Prog and Sustain Energy

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The role of SiO2 and its interaction with Fenton's reagent in fluidized bed Fenton (FBF) process were investigated in this work. Due to the inherent complexity of fluidized bed process, theoretical and experimental approaches were adopted in the study. Quantum computational approach was employed to predict the thermodynamic feasibilities of the possible interactions in the process. Experiments were conducted to study the effect of carrier loading and its contribution to the pollutant removal. FESEM/EDX and FTIR analyses were used to investigate the changes on the surface of the carriers due to interaction with Fenton's reagent. The results of quantum analysis show that with ΔG = −0.3263052 kcal/mol, complex formation between SiO2 and H2O2 is highly feasible. This is attributed to the siloxane bridge (Si–O–Si) of the SiO2 network. The experimental results revealed that carrier loading has a positive effect on the process and more than 23% of the initial COD can be removed through adsorption. The fluidization process resulted in 20% higher COD removal compared to the conventional Fenton oxidation. The results of both experimental and quantum computation indicated that besides iron crystallization on the carriers, other interactions are also possible in the FBF process. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Online monitoring of Fenton‐mediated reactive red 6B oxidation kinetics

Cited by 11 publications

References 34 publications

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Decreasing COD in Sugarcane Vinasse Using the Fenton Reaction: The Effect of Processing Parameters

Fenton oxidation treatment of recalcitrant dye in fluidized bed reactor: Role of SiO₂ as carrier and its interaction with fenton's reagent

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Online monitoring of Fenton‐mediated reactive red 6B oxidation kinetics

Cited by 11 publications

References 34 publications

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Decreasing COD in Sugarcane Vinasse Using the Fenton Reaction: The Effect of Processing Parameters

Fenton oxidation treatment of recalcitrant dye in fluidized bed reactor: Role of SiO2 as carrier and its interaction with fenton's reagent

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Product

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Fenton oxidation treatment of recalcitrant dye in fluidized bed reactor: Role of SiO₂ as carrier and its interaction with fenton's reagent