Degradation of humic acid from water by advanced electrochemical oxidation method

Three types of composite electrode materials, i.e. carbon nanotubes-epoxy (CNT), zeolite-carbon nanotubes-epoxy (ZCNT) and TiO2-modified zeolite-carbon nanotubes-epoxy (TiZCNT), were synthesized, morphologically and electrically characterized, and tested in the photoelectrodegradation of pentachlorophenol (PCP) from water. The electrode composite materials were synthesized by the two-roll mill method, and a higher porosity of zeolite-modified electrode, caused by the zeolite incorporation, was noticed by means of scanning electron microscopy. Electroactive surface area, determined by classical methods using cyclic voltammetry (CV), and electric conductivity, determined by the four-point method, were negatively affected by the presence of zeolite. The photoelectrochemical behaviour of the electrodes, under ultraviolet (UV) irradiation, towards the pentachlorophenol oxidation was studied, and the photoelectrocatalytic activity of each electrode was determined. The PCP oxidation occurred in two steps at +0.65 V and +0.94 V vs. saturated calomel electrode SCE under UV irradiation. The oxidation peak recorded at +0.65 V vs. SCE appeared only under UV irradiation and it is considered that the photoelectrooxidation peak corresponded to PCP photoelectrooxidation. Also, the enhancement of PCP electrooxidation at +0.94 V vs. SCE was noticed under UV irradiation, which confirmed the photelectrocatalytic activity. The performance of the PCP degradation process, expressed as degradation efficiency and electrochemical efficiency, recommended the operation of photoelectrocatalysis at a bias voltage application of +0.8 V/SCE, while the mineralization degree recommended a bias voltage value of +1.5 V/SCE.

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“…In addition to the PCP removal process efficiency, the electrochemical efficiency for PCP oxidation, E amper , was obtained based on eqn. 2 [21]:…”

Section: Electrode Characterization and Testing In Pcp Photelectrodegmentioning

confidence: 99%

TIO₂-MODIFIED ZEOLITE-CARBON NANOTUBES COMPOSITE ELECTRODE FOR PHOTOELECTRODEGRADATION OF PENTACHLOROPHENOL FROM WATER UNDER UV IRRADIATION

Jakab

Pode

Pop

et al. 2017

WIT Transactions on Ecology and the Environment

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“…The performance of the PCP electrochemical and photoelectrochemical degradation process was assessed in terms of the electrochemical efficiency, expressed by eqn (1) [13]:…”

Section: Electrochemical and Photoelectrochemical Applicationsmentioning

confidence: 99%

Advanced degradation of pentachlorophenol from water and process control using carbon nanofibers based composite electrodes

Jakab¹,

Manea²,

Pop³

et al. 2015

WIT Transactions on the Built Environment

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In the present study, carbon nanofibers-epoxy composite and TiO 2-modified carbon nanofibers-epoxy composite (TiO 2-CNF) electrodes were prepared by the two-roll mill procedure and characterized morpho-structurally and electrically in order to degrade pentachlorophenol (PCP) from water. Also, taking into account the dual character of the electrode material and electrochemical techniques, the composite electrodes were tested for PCP detection envisaging the degradation process control. Electrochemical and photoelectrochemical characterization of the electrodes was performed by cyclic voltammetry technique in 0.1 M Na 2 SO 4 supporting electrolyte. The degradation process performance was assessed in terms of electrochemical efficiency and a great enhancement of about 25 times was achieved for the photoelectrochemical process in comparison with electrochemical one using TiO 2-CNF composite electrode. This electrode exhibited useful peculiarities for PCP detection application both under and without UV irradiation. The validity of the proposed CV-based protocol using a TiO 2-CNF composite electrode was determined by its application in the PCP degradation process control. Good accuracy was found by comparison with the results obtained by UV-VIS spectrophotometry.

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“…The degradation process efficiency (, %) and electrochemical degradation efficiency (E, mg/C· cm 2 ) for organics degradation was determined based on equations (1) and (2) [37,38]:…”

Section: Analytical Proceduresmentioning

confidence: 99%

Decontamination of Wastewaters Containing Organics by Electrochemical Methods

Manea¹,

Pop²

2013

Water Treatment

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Degradation of humic acid from water by advanced electrochemical oxidation method

Cited by 12 publications

References 24 publications

TIO₂-MODIFIED ZEOLITE-CARBON NANOTUBES COMPOSITE ELECTRODE FOR PHOTOELECTRODEGRADATION OF PENTACHLOROPHENOL FROM WATER UNDER UV IRRADIATION

TIO₂-MODIFIED ZEOLITE-CARBON NANOTUBES COMPOSITE ELECTRODE FOR PHOTOELECTRODEGRADATION OF PENTACHLOROPHENOL FROM WATER UNDER UV IRRADIATION

Advanced degradation of pentachlorophenol from water and process control using carbon nanofibers based composite electrodes

Decontamination of Wastewaters Containing Organics by Electrochemical Methods

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Degradation of humic acid from water by advanced electrochemical oxidation method

Cited by 12 publications

References 24 publications

TIO2-MODIFIED ZEOLITE-CARBON NANOTUBES COMPOSITE ELECTRODE FOR PHOTOELECTRODEGRADATION OF PENTACHLOROPHENOL FROM WATER UNDER UV IRRADIATION

TIO2-MODIFIED ZEOLITE-CARBON NANOTUBES COMPOSITE ELECTRODE FOR PHOTOELECTRODEGRADATION OF PENTACHLOROPHENOL FROM WATER UNDER UV IRRADIATION

Advanced degradation of pentachlorophenol from water and process control using carbon nanofibers based composite electrodes

Decontamination of Wastewaters Containing Organics by Electrochemical Methods

Contact Info

Product

Resources

About

TIO₂-MODIFIED ZEOLITE-CARBON NANOTUBES COMPOSITE ELECTRODE FOR PHOTOELECTRODEGRADATION OF PENTACHLOROPHENOL FROM WATER UNDER UV IRRADIATION

TIO₂-MODIFIED ZEOLITE-CARBON NANOTUBES COMPOSITE ELECTRODE FOR PHOTOELECTRODEGRADATION OF PENTACHLOROPHENOL FROM WATER UNDER UV IRRADIATION