Oxidation/mineralization of 2-Nitrophenol in aqueous medium by electrochemical advanced oxidation processes using Pt/carbon-felt and BDD/carbon-felt cells

Oturan, Nihal; Hamza, Morched; Ammar, Salah; Abdelhédi, Ridha; Oturan, Mehmet A.

doi:10.1016/j.jelechem.2011.07.017

Cited by 51 publications

(21 citation statements)

References 52 publications

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“…Because urine contains many ionic inorganic species dissolved, it is then necessary to study the effects of operating conditions on the efficiency of urine treatment by electrochemical oxidation using BDD anodes. Literature indicated that the current density is the most important operation parameter to be optimized in all electrochemical processes in order to reach high current efficiencies (Bensalah et al 2013;Brillas et al 2009;Lacasa et al 2013;Oturan et al 2011;Panizza and Cerisola 2005;Zhou et al 2011). For this reason, in this work to study the effect of current density on the oxidative degradation of urine, galvanostatic electrolyses of the synthetic urine were carried out at different current densities of 20, 60, and 100 mA cm −2 keeping the other operating parameters unchanged (pH, temperature, organic and inorganic load).…”

Section: Resultsmentioning

confidence: 99%

“…Then, an almost complete depletion of TOC and COD is attained at larger Q regardless of the current density applied. The harsh oxidation conditions that should account for this efficient removal (especially, if compared with other electrodes) is explained in the literature (Haidar et al 2013;Marselli et al 2003;Oturan et al 2011;Panizza and Cerisola 2005;Zhou et al 2011) by the production of higher amounts of hydroxyl radicals (HO • ) generated from oxidation of water at the surface of BDD anodes (Eq. 1).…”

Section: Resultsmentioning

confidence: 99%

“…The great effectiveness of AOPs is due to the production of the hydroxyl radicals (HO • ). Hydroxyl radicals which are non-selective, and very powerful oxidants (E o = 2.80 V/NHE), react very quickly with the organic pollutants to mineralize them in CO 2 , H 2 O, and inorganic ions (Elahmadi et al 2009;Oturan et al 2011) or at least transform into biodegradable compounds. Recently, electrochemical methods which may be easily coupled with green chemical technologies become good candidates to replace conventional methods for the destruction or removal of bio-refractory organics in water.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of synthetic urine by electrochemical oxidation using conductive-diamond anodes

Dbira

Bensalah

Boutarfaïa

et al. 2014

Environ Sci Pollut Res

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In this work, the electrochemical oxidation of synthetic urine by anodic oxidation using boron-doped diamond as anode and stainless steel as cathode was investigated. Results show that complete depletion of chemical oxygen demand (COD) and total organic carbon (TOC) can be attained regardless of the current density applied in the range 20-100 mA cm(-2). Oxalic and oxamic acids, and, in lower concentrations, creatol and guanidine were identified as the main intermediates. Chloride ions play a very important role as mediators and contribute not only to obtain a high efficiency in the removal of the organics but also to obtain an efficient removal of nitrogen by the transformation of the various raw nitrogen species into gaseous nitrogen through chloramine formation. The main drawback of the technology is the formation of chlorates and perchlorates as final chlorine products. The increase of current density from 20 to 60 mA cm(-2) led to an increase in the rate of COD and TOC removals although the process becomes less efficient in terms of energy consumption (removals of COD and TOC after applying 18 Ah dm(-3) were 93.94 and 94.94 %, respectively, at 20 mA cm(-2) and 89.17 and 86.72 %, respectively, at 60 mA cm(-2)). The most efficient conditions are low current densities and high temperature reaching total mineralization at an applied charge as low as 20 kAh m(-3). This result confirmed that the electrolysis using diamond anodes is a very interesting technology for the treatment of urine.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Treatment of synthetic urine by electrochemical oxidation using conductive-diamond anodes

Dbira

Bensalah

Boutarfaïa

et al. 2014

Environ Sci Pollut Res

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“…Advanced oxidation processes (AOPs) have been effective for the mineralization of several types of organic pollutants such as phenols, polyphenols, aromatic dyes, pharmaceuticals, etc. [24]- [29]. In particular, photo-Fenton UV/H 2 O 2 is often successfully used in removing pollutants in various wastewater treatments.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

Dbira¹,

Boutarfaïa²,

Bensalah³

2014

AJAC

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In this work, the degradation of 2-chloro-4,6-diamino-1,3,5-triazine in aqueous solutions by photo-Fenton process has been investigated. The preliminary results have shown that the degradation of 2-chloro-4,6-diamino-1,3,5-triazine by photo-Fenton process is more rapid and more effective than Fenton and UV/H2O2 processes. The effects of certain experimental parameters on kinetics and efficiency of the degradation of 2-chloro-4,6,-diamino-1,3,5-triazine by photo-Fenton process, have been evaluated. Under optimal conditions, photo-Fenton process achieved more than 90% of chloride release and about 30% of nitrate formation. The results of total organic carbon (TOC) and total Kjeldahl nitrogen (TKN) analyses have shown that no carbon dioxide and ammonia are formed during photo-Fenton treatment of aqueous solutions containing 40 mg/L triazine. These results indicate that only substituent groups of triazine ring are released; however, nitrogen atoms of triazine ring remain unaffected. A simple mechanism of degradation of 2-chloro-4,6-diamino-1,3,5-triazine has been proposed. The degradation starts by a rapid release of chlorine atoms as chloride ions to form 2-hydroxy-4,6-diamino-1,3,5-triazine. The amino groups of 2-hydroxy-4,6-diamino-1,3,5-triazine undergo are oxidized into nitro groups by hydroxyl radicals to form 2-hydroxy-4,6-dinitro-1,3,5-triazine which undergoes a slow release of nitro groups and their substitution with hydroxyl groups to form cyanuric acid and nitrate ions. The degradation of cyanuric acid by photo-Fenton process has also been investigated. The results of TOC and TKN analyzes show that no carbon dioxide is formed during the treatment.

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“…These include, carbon felt [39,40], graphite [41][42][43], reticulated vitreous carbon [44,45], boron-doped-diamond (BDD) [43,46], and even carbon nanotubes coated cathodes [47,48]. The capacity of H 2 O 2 production of these different cathodes depends strongly on the different operating conditions used in different works.…”

Section: Tetrahedral Coordinations Carbon Nanostructures With Varioumentioning

confidence: 99%

Correlation of sp2 carbon bonds content in magnetron-sputtered amorphous carbon films to their electrochemical H2O2 production for water decontamination applications

Pandiyan

Delegan

Dirany

et al. 2015

Carbon

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Oxidation/mineralization of 2-Nitrophenol in aqueous medium by electrochemical advanced oxidation processes using Pt/carbon-felt and BDD/carbon-felt cells

Cited by 51 publications

References 52 publications

Treatment of synthetic urine by electrochemical oxidation using conductive-diamond anodes

Treatment of synthetic urine by electrochemical oxidation using conductive-diamond anodes

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

Correlation of sp2 carbon bonds content in magnetron-sputtered amorphous carbon films to their electrochemical H2O2 production for water decontamination applications

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