Removal of cationic dye methylene blue by zero-valent iron: Effects of pH and dissolved oxygen on removal mechanisms

Sun, Xuan; Kurokawa, Tomoyo; Suzuki, Moe; Takagi, Minoru; Kawase, Y.

doi:10.1080/10934529.2015.1038181

Cited by 62 publications

(23 citation statements)

References 46 publications

(100 reference statements)

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“…This phenomenon can further contribute to the decolorization of AO7 due to the anionic characteristic of AO7 under the examined conditions. Thus, coagulation/flocculation and adsorption processes are involved for the decolorization of AO7 in mFe/Cu‐BPs system, where similar phenomena were reported for the degradation of methylene blue and chromium . On the other hand, when the initial pH was further increased from 6.5 to 8.0, the decolorization efficiency and k obs significantly declined to 85.47% and 0.0660 min −1 ( R 2 =0.9922), respectively.…”

Section: Resultssupporting

confidence: 67%

“…Similar results at different Fe/Cu-BPs dosage have also been reported for the removal of Acid Red 73 [9], AO7 [11], pnitrophenol [12], and nitrobenzene [13]. These phenomena may be attributed to two reasons: (1) when the range of mFe/Cu-BPs dosage was up to 45 g/L, the total surface area and catalytic sites on the surface of mFe/Cu-BPs increases, enhancing both mass transport rates of intermediates between the solution phase and the mFe/Cu-BPs surface and facilitating the generation of infinite galvanic cells [11,14,31,35]; (2) when the range of mFe/Cu-BPs dosage > 45 g/L, the mass transfer rate dictates the overall process, rather than mFe/Cu-BPs dosage. In other words, mass transfer rates of AO7 and its intermediates will be suppressed considerably due to overloading the system, and thereby negatively impacting k obs [36][37][38].…”

Section: Effect Of Mfe/cu-bps Dosage On the Decolorization Of Ao7mentioning

confidence: 99%

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Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Jung

Choi

Lee

et al. 2017

Env Prog and Sustain Energy

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Iron‐based bimetallic particle has become an attractive material in environmental remediation, particularly for wastewater treatment. However, it is yet to be applied in large scale processes, mainly due to the requirement of multistep syntheses for the desired materials, as well as the rigorous control of the conditions for its synthesis. This study introduces a facile methodology to synthesize micro‐size iron/copper bimetallic particles (mFe/Cu‐BPs) by in situ coating of Cu on the surface of Fe in an acidic media for the removal of azo dye Acid Orange 7 (AO7) in aqueous media. Morphological analyses showed that Cu planted on the surface of the particles exhibit a dense leaf‐like structure with great connectivity and electron movement between Fe0 core and Cu shell. In addition, the effects on the decolorization of AO7 via key parameters such as theoretical Cu mass loading (TMLCu), initial pH, dosage, and initial AO7 concentration were assessed. Experimental results revealed that the decolorization efficiency of AO7 was highly dependent on the operational conditions. Under optimal conditions (TMLCu of 0.6 g Cu/g Fe, initial pH of 3.0, mFe/Cu‐BP dosage of 45 g/L, and initial AO7 concentration of 1000 mg/L), decolorization of AO7 as a function of reaction time was investigated via UV‐vis spectrometry, which confirmed that the azo bond of AO7 successfully cleaved by mFe/Cu‐BPs. The maximum decolorization, COD, and TOC removal efficiencies were found to be 99.55, 83.91, and 73.81% after 30 min of reaction time, respectively. Lastly, the potential mechanism for the decolorization of AO7 is proposed. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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Section: Resultssupporting

confidence: 67%

Section: Effect Of Mfe/cu-bps Dosage On the Decolorization Of Ao7mentioning

confidence: 99%

Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Jung

Choi

Lee

et al. 2017

Env Prog and Sustain Energy

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“…Hydrazine is toxic to human and environment, as well as nitrification microorganisms [13]. OH* radical has been used to remove chemical toxic pollutants [14], [15]. Sun suggested that application of nZVI was a good technology in decolorization of cationic dye methylene blue [14].…”

Section: Introductionmentioning

confidence: 99%

“…OH* radical has been used to remove chemical toxic pollutants [14], [15]. Sun suggested that application of nZVI was a good technology in decolorization of cationic dye methylene blue [14]. Bremner investigated the degradation of the model pollutant phenol with hydroxyl radicals generated from zerovalent iron and hydrogen peroxide [15].…”

Section: Introductionmentioning

confidence: 99%

Removal of Ethanolamine (ETA) and COD Produced in a Power Plant Wastewater by Nano-ZVI (Zerovalent Iron) and Hydrogen Peroxide (H2O2)

Lee¹,

Park²,

Lee³

2019

IJESD

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Ethanolamine (C 2 H 7 NO, ETA) is used in a power plant to prevent plumbing system from corrosion by maintaining pH at a certain level. Water flowing inside the plumbing system should periodically be cleaned using ion exchange resin. On the way of regeneration of the resin by sulfuric acid, ethanolamine wastewater is produced.Removal mechanism of ETA has not been well established because it is very much resistant material in biodegradability, and even in chemical degradation. In this research high concentration of ETA ranging 5,000 ~ 9,000mg/l was successfully removed closely down to zero level using nano sized zerovalent iron powder (nZVI) and appropriate amount of hydrogen peroxide (H 2 O 2 ). Organic material of high COD concentration (6,000 ~ 13,500mg/l) was also contained in the wastewater along with high concentration of ETA. COD of the wastewater was simultaneously reduced down to 2,500 ~ 6,000mg/l along with ETA when catalytic oxidation of nZVI with hydrogen peroxide takes place, which can be removed further in a biological system of the following process. Removal rate of ETA showed highest at pH 3.Wastewater produced in a power plant containing high concentrations of ETA and COD could be successfully treated up to the level, from which biological process can be applied for direct discharge to the natural water body.Index Terms-Ethanolamine (ETA), hydrogen peroxide (H 2 O 2 ), nZVI (nano Zerovalent iron), nuclear power plant, COD.

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“…Fe 0 is a promising reactive medium because it is readily available at low costs and has low toxicity . Moreover, it can be easily separated from the solution with a simple magnetic process, which shows its superiority to Fe 2+ . Compared with the traditional Fenton process, the amount of iron ions in the solution in the AFP can be reduced by 50% so that iron sludge is significantly reduced …”

Section: Introductionmentioning

confidence: 99%

Mineralization of N‐Methyl‐2‐Pyrrolidone by UV‐Assisted Advanced Fenton Process in a Three‐Phase Fluidized Bed Reactor

Liu

Zhang

et al. 2018

CLEAN Soil Air Water

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N‐Methyl‐2‐pyrrolidone (NMP), a commonly used solvent in industries, is treated with zero‐valent iron (Fe0) and hydrogen peroxide (H2O2) under UV irradiation. The reaction is carried out in a three‐phase fluidized bed reactor to ensure the smooth and continuous circulation of the Fe0 powder. The results reveal that NMP can be efficiently mineralized by UV‐assisted Fe0/H2O2 process (advanced photo‐Fenton process) with aeration. The mineralization process is properly fitted with the pseudo‐first order kinetics (R2 > 0.93). To determine the optimum conditions for NMP mineralization, the effects of pH, Fe0 dosage, H2O2 concentration, and initial NMP concentration are investigated. Addition of 0.05 g L−1 Fe0 and 0.1 M H2O2 yields 85.2% total organic carbon removal of NMP (10 mM) in 6 h at pH 4.0 ± 0.2. To explore the changes of the nitrogen species, released NO2−, NO3−, and NH4+ are also monitored during the reaction. The present study provides an effective method for the mineralization of NMP‐containing wastewater.

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Removal of cationic dye methylene blue by zero-valent iron: Effects of pH and dissolved oxygen on removal mechanisms

Cited by 62 publications

References 46 publications

Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Removal of Ethanolamine (ETA) and COD Produced in a Power Plant Wastewater by Nano-ZVI (Zerovalent Iron) and Hydrogen Peroxide (H2O2)

Mineralization of N‐Methyl‐2‐Pyrrolidone by UV‐Assisted Advanced Fenton Process in a Three‐Phase Fluidized Bed Reactor

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