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

Dbira, Sondos; Boutarfaïa, Ahmed; Bensalah, Nasr

doi:10.4236/ajac.2014.58059

Cited by 16 publications

(14 citation statements)

References 39 publications

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“…Toxicity tests showed that the partial mineralization may be responsible for the presence of degradation products which can be either more toxic than the original dye or may be further degraded to nontoxic products. The degradation of 2-chloro-4,6-diamino-1,3,5-triazine and of cyanuric acid by photo-Fenton process have been reported by Dbira et al 41 . It was observed that that the degradation of these compounds by photo-Fenton process is faster and effective than Fenton and UV/H 2 O 2 processes.…”

Section: Homogeneous Fenton and Photo-fenton Processesmentioning

confidence: 80%

Greener And Expedient Approach for the Wastewater Treatment by Fenton and Photo-Fenton Processes: A Review

Jain

Marazban

Khan

2016

AJCPS

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Advanced Oxidation Processes (AOPs) have emerged as a promising technology for the treatment of wastewaters containing toxic, recalcitrant organic compounds such as dyes, pesticides etc. This review paper focuses on the Fenton and photo- Fenton technique which is one of the most efficient AOPs developed to decolorize and/or degrade organic pollutants. This oxidation method can produce biodegradable intermediates and mineralize complex organic pollutants effectively and efficiently. In this paper Fenton and photo-Fenton methods are categorised into two broad groups as homogeneous and heterogeneous Fenton and photo-Fenton processes. Applications of fundamental and advanced combined Fenton and photo-Fenton processes are also discussed.

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Section: Homogeneous Fenton and Photo-fenton Processesmentioning

confidence: 80%

Greener And Expedient Approach for the Wastewater Treatment by Fenton and Photo-Fenton Processes: A Review

Jain

Marazban

Khan

2016

AJCPS

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“…Fenton and photo-Fenton reactions are strongly pH-dependent as reported in the literature [40][41][42][43]. Especially, it is well reported that the initial pH conditions significantly influence the production of hydroxyl radicals [20,[43][44][45][46]. To examine the effect of initial pH on the treatment of aqueous solutions containing 100 mg/L of 4EP by the heterogeneous photo-Fenton process, the initial pH values was varied in the range between 3 and 9 using 1000 mg/L H 2 O 2 and 40 mg/L Fe 3 O 4 at room temperature and a stirring rate under 300 rpm.…”

Section: Detailed Onvestigations Of the Degradation Of 4ep By The Hetmentioning

confidence: 81%

“…Particularly, advanced oxidation processes (AOPs) showed high potential to degrade various bioresistant and hazardous organic pollutants in water [18][19][20]. These processes are capable of mineralizing several types of organic pollutants, including phenols, polyphenols, pesticides, pharmaceuticals, etc.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Degradation of 4-Ethylpyridine in Water by Heterogeneous Photo-Fenton Process

2019

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In this work, the degradation of 4-ethylpyridine (4EP) in water by a heterogeneous photo-Fenton process (H2O2/Fe3O4/ultraviolet irradiation (UV)) was investigated. More rapid and effective 4EP degradation was obtained with H2O2/Fe3O4/UV than Fenton-like (H2O2/Fe3O4) and UV/H2O2, which is due to the larger production of hydroxyl radicals from the chemical and photolytic decomposition of H2O2. The operational conditions were varied during 4EP degradation experiments to evaluate the effects of pH, catalyst, concentration, and temperature on the kinetics and efficiency of H2O2/Fe3O4/UV oxidation. Under optimal conditions (100 mg/L 4EP, [H2O2] = 1000 mg/L, Fe3O4 = 40 mg/L, pH = 3 and room temperature, 300 rpm), 4EP was totally declined and more than 93% of the total organic carbon (TOC) was eliminated. Liquid chromatography analysis confirmed the formation of aromatic and aliphatic intermediates (4-hydroxypyridine, 4-pyridone, malonic, oxalic, and formic acids) that resulted in being mineralized. Ion chromatography analysis demonstrated the stoichiometric release of NH4+ ions during 4EP degradation by heterogeneous photo-Fenton oxidation. The reuse of the heterogeneous catalyst was evaluated after chemical and heat treatment at different temperatures. The heat-treated catalyst at 500 °C presented similar activity than the pristine Fe3O4. Accordingly, heterogeneous photo-Fenton oxidation can be an alternative method to treat wastewaters and groundwater contaminated with pyridine derivatives and other organic micropollutants. The combination of heterogeneous photo-Fenton oxidation with classical biological methods can be proposed to reduce the overall cost of the treatment in large-scale water treatment plants.

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“…However, at a pH higher than 3.2, the formation of ferric hydroxide complexes Fe(OH) 3 and the auto-decomposition of H 2 O 2 to oxygen and water reduces the generation of hydroxyl radicals, which decreases the degradation efficiency of DAP. Additionally, the formation of Fe(III)-complexes at high pH values limits the regeneration of ferrous ion (Fe 2+ ) catalyst and then reduces the regeneration of hydroxyl radicals [24,25]. Several studies have reported that pH can dramatically affect the degradation of organic pollutants such as phenols, dyes, and petrochemicals by Fenton oxidation.…”

Section: Influence Of Initial Phmentioning

confidence: 99%

Degradation of Diallyl Phthalate (DAP) by Fenton Oxidation: Mechanistic and Kinetic Studies

et al. 2018

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In this work, the degradation and mineralization of Diallyl Phthalate (DAP) in water by Fenton oxidation was investigated. The effects of different experimental parameters including the initial pH, the hydrogen peroxide (H 2 O 2 ) dose, the catalyst (Fe 2+ ) dose, the iron source, and the DAP concentration on the rate and the yield of DAP degradation by Fenton oxidation were evaluated. DAP and its intermediates were quantified by high performance liquid chromatography (HPLC) analysis and the measurement of total organic carbon (TOC) during Fenton oxidation. The results obtained confirmed that hydroxyl radicals (HO • ) generated from Fenton's reaction were capable of completely eliminating DAP from water. Fenton oxidation of 100 mg/L DAP aqueous solution at pH = 3.2 required 1000 mg/L H 2 O 2 and 50 mg/L Fe 2+ . Under these conditions, more than TOC removal exceeded 95% after 300 min Fenton oxidation. The competition kinetics method was used to determine an absolute rate constant of 7.26.10 9 M −1 s −1 for the reaction between DAP and HO • radicals. HPLC analysis showed that phthalic acid, 1,2-dihydroxybenzene, 1,2,4-trihydroxybenzene, maleic acid, formic acid and oxalic acid were the main intermediates formed during DAP degradation. Accordingly, a simple DAP degradation mechanism by the Fenton reaction was proposed. These promising results proved the potential of Fenton oxidation as a cost-effective method for the decontamination of wastewaters containing phthalates.

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

Cited by 16 publications

References 39 publications

Greener And Expedient Approach for the Wastewater Treatment by Fenton and Photo-Fenton Processes: A Review

Greener And Expedient Approach for the Wastewater Treatment by Fenton and Photo-Fenton Processes: A Review

Catalytic Degradation of 4-Ethylpyridine in Water by Heterogeneous Photo-Fenton Process

Degradation of Diallyl Phthalate (DAP) by Fenton Oxidation: Mechanistic and Kinetic Studies

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