Bio-electrocatalytic dechlorination of 2,4-dichlorophenol. Effect of pH and operational configuration

León-Fernandez, Luis Fernando; Rodrigo, Manuel A.; Villaseñor, José; Fernández-Morales, Francisco Jesús

doi:10.1016/j.electacta.2020.137456

Cited by 13 publications

(24 citation statements)

References 35 publications

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“…6c, d. The positive influence of lower cathode pH can be observed, as suggested by Leon-Fernandez et al [31]. Siumulations operating at cathode pH 2.0 and 5.0 are nearly identical.…”

Section: Resultssupporting

confidence: 64%

“…The present subsection briefly describes the laboratory-scale BES experimental conditions used by Leon-Fernandez et al [ 31 ] to obtain the experimental data. The MFC setup consisted of two 0.1 L volume chambers (bioanode and abiotic cathode compartments), separated by a proton exchange membrane (PEM, Nafion ® 117, DuPont).…”

Section: Methodsmentioning

confidence: 99%

“…However, it was considered that the model should adequately reproduce the system performance working under different pH values, but with a unique set of final parameters, except f and the apparent value of µ max,e (that is, the influence of catholyte pH would be observed from the variations in f and µ max,e ). Figure 2 shows the experimental results (data points) reported by Leon-Fernandez et al [31] and the model predictions (lines) regarding the concentrations of S (in anode chamber) and 2,4-DCP, 2-CP, 4-CP, phenol and chloride (in cathode chamber) during a batch MFC operation cycle. Values of the r 2 coefficient for each series are reported in the supplementary material, table SM1.…”

Section: Tablementioning

confidence: 99%

“…The present work is based on a previously published paper by the same authors [ 31 ], wherein the electrocatalytic hydrodechlorination of 2,4-DCP in a BES working as an MFC under different pH values at the cathode chamber was studied. They found that it was feasible to achieve the transformation of 2,4-DCP by electrocatalytic hydrogenolysis and that greater acidic conditions at the cathode enhanced 2,4-DCP dechlorination and power generation.…”

Section: Introductionmentioning

confidence: 99%

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Modelling the cathodic reduction of 2,4-dichlorophenol in a microbial fuel cell

León-Fernandez

Fernández-Morales

Villaseñor

2022

Bioprocess Biosyst Eng

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This work presents a simplified mathematical model able to predict the performance of a microbial fuel cell (MFC) for the cathodic dechlorination of 2,4-dichlorophenol (2,4-DCP) operating at different cathode pH values (7.0 and 5.0). Experimental data from previous work were utilized for the fitting of the model. The MFC modelled consisted of two chambers (bioanode and abiotic cathode), wherein the catholyte contained 300 mg L−1 of 2,4-DCP and the anolyte 1000 mg L−1 of sodium acetate. The model considered two mixed microbial populations in the anode compartment using sodium acetate as the carbon source for growth and maintenance: electrogenic and non-electrogenic biomass. 2,4-DCP, its intermediates of the reductive process (2-chlorophenol, 2-CP and 4-chlorophenol, 4-CP) and protons were considered in the model as electron acceptors in the electrogenic mechanism. The global process rate was assumed to be controlled by the biological mechanisms and modelled using multiplicative Monod-type equations. The formulation of a set of differential equations allowed to describe the simultaneous evolution of every component: concentration of sodium acetate in the anodic compartment; and concentration of 2,4-DCP, 2-CP, 4-CP, phenol and chloride in the cathode chamber. Current production and coulombic efficiencies were also estimated from the fitting. It was observed that most of the organic substrate was used by non-electrogenic mechanism. The influence of the Monod parameters was more important than the influence of the biomass yield coefficients. Finally, the model was employed to simulate different scenarios under distinct experimental conditions.

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“…6c, d. The positive influence of lower cathode pH can be observed, as suggested by Leon-Fernandez et al [31]. Siumulations operating at cathode pH 2.0 and 5.0 are nearly identical.…”

Section: Resultssupporting

confidence: 64%

Section: Methodsmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling the cathodic reduction of 2,4-dichlorophenol in a microbial fuel cell

León-Fernandez

Fernández-Morales

Villaseñor

2022

Bioprocess Biosyst Eng

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“…An increase in pH from 3.12 (moderately acidic) to 4.05 ± 0.092 (slightly acidic) from the first to the seventh day is seen, followed by a decrease until the last day (3.30 ± 0.27), showing acidic pH throughout the monitoring. According to León et al, (2021), in pH with acidic levels, energy generation increases because it contributes to a higher potential of concentration of microorganisms for substrate oxidation [27,28]. Likewise, due to high concentrations of fermentable carbohydrates in cells, pH can drop rapidly due to the formation of acidic products by fermentative metabolism.…”

Section: Resultsmentioning

confidence: 99%

Bioelectricity Production from Blueberry Waste

et al. 2021

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Global warming and the increase in organic waste from agro-industries create a major problem for the environment. In this sense, microbial fuel cells (MFC) have great potential for the generation of bioelectricity by using organic waste as fuel. This research produced low-cost MFC by using zinc and copper electrodes and taking blueberry waste as fuel. A peak current and voltage of 1.130 ± 0.018 mA and 1.127 ± 0.096 V, respectively, were generated. The pH levels were acid, with peak conductivity values of 233. 94 ± 0.345 mS/cm and the degrees Brix were descending from the first day. The maximum power density was 3.155 ± 0.24 W/cm2 at 374.4 mA/cm2 current density, and Cándida boidinii was identified by means of molecular biology and bioinformatics techniques. This research gives a new way to generate electricity with this type of waste, generating added value for the companies in this area and helping to reduce global warming.

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