Degradation of Acid Orange 7 by electrochemically generated •OH radicals in acidic aqueous medium using a boron-doped diamond or platinum anode: A mechanistic study

Hammami, S.; Bellakhal, Nizar; Oturan, Nihal; Oturan, Mehmet A.; Dachraoui, M.

doi:10.1016/j.chemosphere.2008.07.010

Cited by 197 publications

(81 citation statements)

References 45 publications

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“…However, the iron ions concentration in later stage of treatment substantially exceeded the optimal catalytic dose of ferrous ions (0.1 mM) in process of GAD with ferrous. And excessive iron ions in solution would be not conducive to further oxidation of AO7, since these ions can react with intermediate products (such as carboxylic acids) to form stable ferro-and/or ferricomplexes [4]. Hence, restriction of treatment time should be taken into consideration when optimizing the GAD/ZVI system.…”

Section: Evolution Of Iron In the Process Of Gad With Fementioning

confidence: 99%

“…AOPs have typically been defined as those water cleaning technologies because they are based on the generation of hydroxyl radicals (ÁOH), which are powerful oxidizing agents capable of unselectively degrading a great variety of biorecalcitrant organic compounds. Common AOPs such as Fenton reaction, photo-Fenton process, electro-Fenton process, ozonation, photo catalysis, non-thermal plasma, irradiation by ultrasonic, electronic beams or c-ray and so on, are all applied to investigate the degradation of the azo dye AO7 by many authors [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Zhang

Wang

et al. 2010

Plasma Chem Plasma Process

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A new plasma-catalysis process of gliding arc discharge (GAD) plasma with zero-valent iron (ZVI) was examined. Because GAD plasma creates an acidic environment, solid iron releases ferrous ions which act as a catalyst for the decomposition of the hydrogen peroxide. A comparative study of the catalytic effects between Fe 2? and Fe 0 in GAD plasma was investigated. The decolorization reactions of Acid Orange 7 (AO7) followed pseudo-first-order kinetics. And the rate constants for the process of GAD with ZVI was increased by 30% and by 19%, respectively, compared with the process of GAD alone and the process of GAD with ferrous. The investigations of solution pH and hydrogen peroxide both demonstrated that the GAD plasma induced conditions are much suitable for advanced Fenton reactions. The corrosion of ZVI in GAD plasma can give continuous ferrous ions to sustain Fenton reaction. Also, ZVI was demonstrated to have favorable reusable feature.

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Section: Evolution Of Iron In the Process Of Gad With Fementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Zhang

Wang

et al. 2010

Plasma Chem Plasma Process

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“…It is known that Pt has excellent electrocatalytic performance ability, especially those with the nanostructures (Kardash and Korzeniewski 2000;Martinez-Huitle and Ferro 2006;Hammami et al 2008). The surface morphology of the nano-Pt/Ti electrode in Fig.…”

Section: Resultsmentioning

confidence: 97%

Hydrothermal electrocatalytic oxidation for the treatment of herbicides wastewater

Xiao

Gao

et al. 2016

Environ Sci Pollut Res

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A hydrothermal electrocatalytic oxidation (HTECO) method is adopted to treat the biorefractory and toxic 2,4-dichlorophenoxyacetic acid (2,4-D) herbicides wastewater on nano-Pt/Ti electrode in the existence of H2O2. Comparisons for the removal of 2,4-D and total organic carbon (TOC) have been carried out between HTECO with individual electrochemical oxidation (EO) and hydrothermal catalytic oxidation (HTCO), showing that high mineralization efficiency was obtained in HTECO process. The possible factors resulting in the high removal efficiency in HTECO process have been studied by investigating the properties of the electrode and solution in hydrothermal condition, the amount of active radicals, the decay kinetic, and evolution of main intermediates of 2,4-D. Thus, an enhanced mechanism for HTECO method for the treatment of herbicides wastewater has been obtained.

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“…Synthetic dyes with wide variety of chemical structures and compositions of inorganic and organic compounds are one of the main groups of pollutants in wastewater (Divya et al 2013;Robinson et al 2001).A large amount of synthetic dyes is widely consumed in the textile industry for dyeing processes, and about 50 % of these are azo dyes (Hammami et al 2008). The chemical structures of these compounds have one or more azo groups, which are responsible for the dye color, and functional groups such as -NH2, -OH, -CH3, and -SO3 for the fixation of these dyes to fibers (Melgoza et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and application of multiple rods gold–zinc oxide nanostructures in the photocatalytic degradation of methyl orange

Chamjangali

Bagherian

Bahramian

et al. 2014

Int. J. Environ. Sci. Technol.

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Zinc oxide and gold-zinc oxide (Au-ZnO) nanostructures with multiple rods (multipods) morphology were successfully prepared. Au-ZnO nanostructures were synthesized via a simple precipitation route method in the presence of oligoaniline-coated gold nanoparticles. The Au-ZnO catalyst obtained was applied for the degradation of methyl orange in an aqueous solution under UV irradiation. Effects of the operational parameters such as the solution pH, amount of photocatalyst, and dye concentration on the photocatalytic degradation and decolorization of methyl orange were studied. Detailed studies including kinetic study and regeneration of catalyst were carried out on the optimal conditions for the photodegradation of methyl orange by Au-ZnO multipods in aqueous solution. Effect of foreign species on the photodegradation of methyl orange was also studied. An enhancement of the photocatalytic activities for photodegradation of methyl orange was observed when the gold nanoparticles were loaded on the zinc oxide multipods. The proposed catalyst was applied for the degradation of methyl orange in synthetic wastewater samples with satisfactory results.

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Degradation of Acid Orange 7 by electrochemically generated •OH radicals in acidic aqueous medium using a boron-doped diamond or platinum anode: A mechanistic study

Cited by 197 publications

References 45 publications

Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Hydrothermal electrocatalytic oxidation for the treatment of herbicides wastewater

Synthesis and application of multiple rods gold–zinc oxide nanostructures in the photocatalytic degradation of methyl orange

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