Kinetic modeling of electrochemical degradation of phenol in a three-dimension electrode process

Wang, Lizhang; Fu, Jianfeng; Qiao, Qi; Zhao, Yuemin

doi:10.1016/j.jhazmat.2006.09.091

Cited by 31 publications

(7 citation statements)

References 39 publications

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“…The effect of current density is an important factor in electrochemical degradation of organic pollutants [24]. The enhancement effects are for the increase in the driving force for the electron transfer of the electrode reaction, in addition to the increase of applied current density which is attributed to the increase of ionic transport so as to increase the rate of generation of OH • which is responsible for the BPA oxidation process with increasing applied current density [44]. It is important to note that very fast BPA degradation with short period of electrolysis time for electrocoagulation followed by electrochemical oxidation processes.…”

Section: Electrochemical Oxidation Processmentioning

confidence: 99%

Electrochemical treatment of endocrine-disrupting chemical from aqueous solution

Govindaraj

Pattabhi

2015

Desalination and Water Treatment

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Treatment of endocrine-disrupting chemical (EDC) from aqueous solution was studied using electrocoagulation followed by electrochemical oxidation techniques. An aqueous solution of bisphenol-A (BPA) was used as the model contaminant of EDC. The present experimental study has revealed two major treatment techniques such as electrocoagulation followed by electrochemical oxidation processes. These two treatments can be operated independently in batch mode processes. In the first stage, the aqueous BPA solution was subjected to the electrocoagulation under various operating conditions. In electrocoagulation, aluminum (Al) electrode, at the current density of 12 mA cm −2 , 56.12% of chemical oxygen demands (COD) removal was achieved in a relatively short treatment time of 20 min. After completion of electrocoagulation, the sample was then subjected to electrochemical oxidation with different current density. In the electrochemical oxidation, complete COD removal could be achieved at current density of 12 mA cm −2 within 50 min of treatment time. Kinetic analysis indicates that the removal rate might be obeyed as a first order model. The results of UV-vis spectrum showed that at the end of the treatment, BPA compound was completely removed from the aqueous solution. Electrochemically produced sludge was characterized using fourier transform infra red spectroscopy.

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Section: Electrochemical Oxidation Processmentioning

confidence: 99%

Electrochemical treatment of endocrine-disrupting chemical from aqueous solution

Govindaraj

Pattabhi

2015

Desalination and Water Treatment

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“…Among various technical problems, the estimation of energy consumption and reaction time, which determines the volume of the electrochemical reactor, are far superior to any other studies during the industrial applications. In a previous publication, we proposed a mathematical model that permits to predict the power consumption via current efficiency and equilibrium constant for phenol oxidation on SnO 2 /Ti anodes and there is a good agreement between theoretical data and experimental results when operated under different residence time and applied current density (Wang et al 2007). On the other hand, the greater capital investments of equipment and electrodes depend on the effective volume of the reactor, which is strongly controlled by the reaction time.…”

Section: Introductionmentioning

confidence: 80%

Determination of reaction rate constants for phenol oxidation using SnO2/Ti anodes coupled with activated carbon adsorption in the presence of TiO2 as catalyst

Zhao

Ding

Wang

et al. 2011

Water Science and Technology

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Series of experiments for phenol degradation with assistance of TiO2 catalyst at pH of 6.5 and temperature of 25 degrees C were conducted using a lab-scale electrochemical reactor constructed in our laboratory. According to the results, at the presence of the TiO2 catalyst the removal of phenol was increased and first-order kinetics could describe the evolution of phenol concentration. For inspecting the relationship between rate constants and dosage of TiO2, two possible kinetics were proposed in this study. Contrasted to the abundant experimental data, a reasonable kinetics was obtained for the estimation of phenol concentration effluent during continuous flow of raw wastewater, especially when the TiO2 dosage was less than 0.5g L(-1). The model obtained from these experiments could employed for the calculation of rate constants at different TiO2 dosage and the necessary dosage of catalyst when a discharge standard was designed.

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“…Studies have shown that the degradation of various organic contaminants follows the pseudo-first order for recirculation systems with low contaminant concentrations (C 0 < 100 mg L −1 ) [23][24][25]. Based on this information, the apparent kinetics (k app , min −1 ) for NOR abatement can be estimated by Eq.…”

Section: Discussionmentioning

confidence: 99%

Using p-Si/BDD anode for the electrochemical oxidation of norfloxacin

Silva

Ortega

Rodrigues

et al. 2019

Journal of Electroanalytical Chemistry

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This study evaluated the electrochemical advanced oxidation process (EAOP) using boron-doped diamond (p-Si/ BDD) anode in the abatement of the antibiotic norfloxacin (NOR). The influence of the applied current density (i app ), initial concentration of NOR, sodium sulfate (Na 2 SO 4 ) concentration and reactor operation conditions were evaluated. The mechanism of NOR oxidation (direct or indirect) was also studied by cyclic voltammetry and chronoamperometry. The results showed that, depending on the i app , and the NOR and Na 2 SO 4 concentration, the NOR could be oxidized by direct electron transfer, with the carbon-sp 2 impurities on the p-Si/BDD surface, and indirect, by persulfate ions (S 2 O 8 2− ), sulfate (SO 4•− ) and/or hydroxyl radicals (HO • ) electrogenerated at the anode surface. When the reactor is operated favoring the electro-generated HO • , NOR abatement and chemical oxygen demand (COD) reduction are simultaneous. Conversely, at the time that the reactor is operated favoring the NOR direct oxidation and by S 2 O 8 2− and SO 4 •− , NOR and COD reduction are not parallel leading to high byproducts formation. Therefore, it is important to know the matrix content (organic and sulfate content), for the correct choice of the operational parameters that will lead to a low byproducts formation.

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Kinetic modeling of electrochemical degradation of phenol in a three-dimension electrode process

Cited by 31 publications

References 39 publications

Electrochemical treatment of endocrine-disrupting chemical from aqueous solution

Electrochemical treatment of endocrine-disrupting chemical from aqueous solution

Determination of reaction rate constants for phenol oxidation using SnO2/Ti anodes coupled with activated carbon adsorption in the presence of TiO2 as catalyst

Using p-Si/BDD anode for the electrochemical oxidation of norfloxacin

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