Influence of Chelating Agents on Fenton-Type Reaction Using Ferrous Ion and Hypochlorous Acid

Kishimoto, Naoyuki; Kitamura, Takashi; Kato, Masaaki; Otsu, Hideo

doi:10.2965/jwet.2013.21

Cited by 24 publications

(24 citation statements)

References 21 publications

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“…Li et al (2007) investigated the effect of EDTA on • OH production during Fenton reaction, and the result showed that EDTA did not affect • OH generation monitored by HPLC assay, but from the electron spin resonance (ESR) spin-trapping measurement, it was showed that EDTA suppresses hydroxyl radical formation. Kishimoto et al reported that iron-chelating agents, such as EDTA, strongly inhibited (70%) the Fenton reaction at pH 2.5 or higher by complex formation with Fe(II) ion and masking of iron (Kishimoto et al 2013). Similar inconsistent results were observed by Wang et al (2011), who observed correlated well with the accelerated • OH formation from the H 2 O 2 decomposition at the BiFeO3 surface.…”

Section: Effect Of Scavengersmentioning

confidence: 99%

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

et al. 2019

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This study aims to evaluate the degradation and mineralization of Malachite Green (MG) in an electro-Fenton process (EFP). We studied the influence of several important parameters including solution pH (2-11), current density (0-20 mA/cm 2), H 2 O 2 concentration (0-200 mg/L) and MG concentrations (200, 600, 1000, 1500, 2000, 3000 mg/L) at different reaction time (2.5-30 min). The intermediates produced during the degradation were determined by GC-MS. The optimum pH, current density and H 2 O 2 concentration were found to be approximately 3, 10 mA/cm 2 and 50 mg/L, respectively. It was concluded that acidic pH was required to increase the efficiency of the EFP. At optimum conditions and a reaction time of 15 min, MG was completely removed without any significant variation in the corresponding maximum wavelengths or new absorption bands. Due to formation of intermediates, almost all the organic compounds were completely mineralized (95.3%) to CO 2 and water at reaction time of 30 min. Results indicated the effect of hydroxyl radical (• OH) on MG degradation is greater than that of superoxide radical scavenger (O ⋅− 2). The results showed that the degradation process of MG followed pseudo-firstorder kinetic model and the treatment time required in EFP was 4.6 times lower than ECP. Furthermore, the results showed that EFP was an extremely efficient process for degradation and mineralization of a high concentration of MG (1000 mg/L) at a short reaction time (30 min).

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Section: Effect Of Scavengersmentioning

confidence: 99%

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

et al. 2019

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“…demonstrated that “the 1:1 iron complexes of EDTA, DTPA, and citrate clearly induce the reduction of H 2 O 2 .” However, Kishimoto et al . discovered that the extent to which Fenton systems were inhibited to degrade 1,4‐dioxane in the presence of oxalate and EDTA decreased as solution pH fell below 6, that is, as the degree of complexation also deceased at lower, acidic pH values, implying that only unchelated Fe(II) ions can be oxidized further.…”

Section: Description Of Treatment Technologiesmentioning

confidence: 99%

Separation of transition metals and chelated complexes in wastewaters

Cheung

2014

Env Prog and Sustain Energy

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This review responds to the ongoing needs of wastewater engineers tasked with treating aqueous solutions containing chelated complexes of metal ions, of which nickel citrate in electrodeless plating and copper–EDTA in electronic chip board manufacturing are two key examples. Because of the presence of these sequestering agents, metallic ions cannot be readily precipitated by alkalinity, making a compelling case for the discovery of alternative methods of treatment. This review is a critical appraisal of the varying degrees of success in separation process strategies deployed for the recovery of metallic ions under such challenging chemical conditions. Guidance is provided on making progress toward satisfactory industrial solutions to surmount these difficulties. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 761–783, 2015

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“…The solution in the reactor was mixed with a magnetic stirrer during the run, and each run continued for 30-45 minutes. The concentration of 1,4-dioxane was determined by high-performance chromatography with a refractive index detector [21]. Since the total volume of diluted sulphuric acid and sodium hydroxide solution added to the reactor for pH control was less than 10 mL, the hypochlorite and 1,4-dioxane concentrations obtained by the chemical analysis were not corrected for discussion.…”

Section: Absorbance Spectrum Of the Hypochlorite Solutionmentioning

confidence: 99%

Effect of pH and molar ratio of pollutant to oxidant on a photochemical advanced oxidation process using hypochlorite

Kishimoto

Nishimura

2015

Environmental Technology

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Ultra violet (UV)-photolysis of hydrogen peroxide (H2O2) is a conventional advanced oxidation process (AOP) and is advantageous in its simplicity, although H2O2 is costly. Accordingly, we tried to substitute H2O2 by hypochlorite in the photochemical AOP, and discussed the effect of pH and the molar ratio of a pollutant to hypochlorite on the process using 1,4-dioxane as a model pollutant. The photochemical treatment of hypochlorite solutions at a wavelength of 254 nm under various pH values revealed that the UV-photolysis of hypochlorous acid (HOCl) species mainly contributed to hydroxyl radical (•OH) production. The reaction efficiency, as defined by the molar ratio of removed 1,4-dioxane to consumed hypochlorite, deteriorated under higher pH levels due to the stronger radical scavenging effect of hypochlorite ion (ClO(-)) as compared to that of HOCl. The optimal pH for the UV-photolysis of hypochlorite as an AOP was found to be in the range of 3-6. The reaction efficiency at a high molar ratio of initial 1,4-dioxane to initial hypochlorite exceeded 100%, which was caused by the regeneration of HOCl from photochemically generated chlorine radicals (•Cl). Finally, the overall reaction of the UV-photolysis of HOCl was proposed on the basis of the radical reactions that were related to chlorine species, which suggested that the UV-photolysis of 1 mmol of HOCl stoichiometrically produced 2 mmol of •OH. Since the use of liquid chlorine is more economical than that of H2O2, the substitution of HOCl for H2O2 in the photochemical AOP was concluded to be feasible from the viewpoints of both stoichiometry and chemical costs.

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Influence of Chelating Agents on Fenton-Type Reaction Using Ferrous Ion and Hypochlorous Acid

Cited by 24 publications

References 21 publications

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

Separation of transition metals and chelated complexes in wastewaters

Effect of pH and molar ratio of pollutant to oxidant on a photochemical advanced oxidation process using hypochlorite

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