Perchloroethylene (PCE) oxidation by percarbonate in Fe2+-catalyzed aqueous solution: PCE performance and its removal mechanism

Miao, Zhouwei; Gu, Xiaoli; Zang, Xuke; Wu, Xiaoliang; Xu, Minhui; Ndong, Landry Biyoghe Bi; Qiu, Zhaofu; Sui, Qian; Fu, George Yuzhu

doi:10.1016/j.chemosphere.2014.09.065

Cited by 76 publications

(39 citation statements)

References 41 publications

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“…The TCE degradation was significantly enhanced from 42% to 70% and 99.8% when SPC concentration increased from 1.0 to 5.0 mM and 10 mM. However, further increase in SPC to 15 mM suppressed the TCE degradation, which might be due to the consumption of SPC from the scavenging characteristic of SPC as shown in the following equations [9–11]. Miao also demonstrated in Fenton like process that the higher concentrations of SPC (H 2 O 2 ) followed quenching reactions which leads towards consumption of OH • i.e.…”

Section: Resultsmentioning

confidence: 99%

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An efficient catalytic degradation of trichloroethene in a percarbonate system catalyzed by ultra-fine heterogeneous zeolite supported zero valent iron-nickel bimetallic composite

Danish

et al. 2017

Applied Catalysis A: General

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Zeolite supported nano iron-nickel bimetallic composite (Z-nZVI-Ni) was prepared using a liquid-phase reduction process. The corresponding surface morphologies and physico-chemical properties of the Z-nZVI-Ni composite were determined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Energy dispersive X-ray spectra (EDS), Brunauer Emmett Teller (BET) adsorption, wide angle X-ray diffractometry (WA-XRD), and Fourier transform infrared spectroscopy (FTIR). The results indicated high dispersion of iron and nickel nano particles on the zeolite sheet with an enhanced surface area. Complete destruction of trichloroethene (TCE) and efficient removal of total organic carbon (TOC) were observed by using Z-nZVI-Ni as a heterogeneous catalyst for a Fenton-like oxidation process employing sodium percarbonate (SPC) as an oxidant. The electron spin resonance (ESR) of Z-nZVI-Ni verified the generation and intensity of hydroxyl radicals (OH•). The quantification of OH• elucidated by using p-chlorobenzoic acid, a probe indicator, confirmed the higher intensity of OH•. The transformation products were identified using GC-MS. The slow iron and nickel leaching offered higher stability and better catalytic activity of Z-nZVI-Ni, demonstrating its prospective long term applications in groundwater for TCE degradation.

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Section: Resultsmentioning

confidence: 99%

“…The 5,5-dimethylpyrroline-1-oxide (DMPO) spin trap electron spin resonance (ESR) was used to investigate OH • generation in the heterogeneous Fenton like reaction to fully understand the reaction mechanism [11]. The signals of DMPO-OH • adduct achieved by Z-nZVI-Ni as a catalyst for the SPC activation are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

An efficient catalytic degradation of trichloroethene in a percarbonate system catalyzed by ultra-fine heterogeneous zeolite supported zero valent iron-nickel bimetallic composite

Danish

et al. 2017

Applied Catalysis A: General

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“…SPC has many advantages for use as an oxidant: (1) it is applicable in a wide pH range [24]; (2) it does not introduce any chemicals into the water matrix that would be considered toxic besides H 2 O 2 ; (3) the end products of oxidation are usually carbon dioxide, water, and sodium carbonate, which occur naturally in groundwater, making it compatible with subsequent bioremediation; and (4) percarbonate acts as a base, raising the pH when introduced into water. This may lead to a buffering effect when SPC is used as an advanced oxidant in the system because the oxidation of contaminants always lowers the pH of the water matrix.…”

Section: Introductionmentioning

confidence: 99%

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Miao¹,

et al. 2015

Chemical Engineering Journal

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The performance of Fe(III)-based catalyzed sodium percarbonate (SPC) for stimulating the oxidation of tetrachloroethene (PCE) for groundwater remediation applications was investigated. The chelating agents citric acid monohydrate (CIT), oxalic acid (OA), and Glutamic acid (Glu) significantly enhanced the degradation of PCE. Conversely, ethylenediaminetetraacetic acid (EDTA) had a negative impact on PCE degradation, which may due to its strong Fe chelation and HO• scavenging abilities. However, excessive SPC or chelating agent will retard PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO• radical oxidation in both the chelated and non-chelated systems, while O2•− also participated in the non-chelated system and the OA and Glu modified systems. According to the electron paramagnetic resonance (EPR) studies, the presence of HO• in the Fe(III)/SPC system was maintained much longer than that in the Fe(II)/SPC system. The results indicated that the addition of CIT, OA or Glu indeed enhanced the generation of HO• in the first 10 min and promoted degradation efficiency by increasing the amount of Fe(III) and maintaining the concentration of HO• radicals in solution. In conclusion, chelated Fe(III)-based catalyzed SPC oxidation is a promising method for the remediation of PCE-contaminated groundwater.

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“…It is also well known that HCO 3 − has an negative influence on advanced oxidation process [19,28], therefore tests to investigate the effect of HCO 3 − on benzene degradation in Fe(III)-catalyzed SPC system were conducted. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The Fe(II)/SPC system has been shown to be effective for degradation of benzene and trichloroethylene [27,28]. The results showed that this system requires high chemical dosages to achieve complete benzene degradation in the Fe(II)/SPC system.…”

Section: Introductionmentioning

confidence: 99%

Benzene oxidation by Fe(III)-activated percarbonate: matrix-constituent effects and degradation pathways

et al. 2017

Chemical Engineering Journal

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Complete degradation of benzene by the Fe(III)-activated sodium percarbonate (SPC) system is demonstrated. Removal of benzene at 1.0 mM was seen within 160 min, depending on the molar ratios of SPC to Fe(III). A mechanism of benzene degradation was elaborated by free-radical probe-compound tests, free-radical scavengers tests, electron paramagnetic resonance (EPR) analysis, and determination of Fe(II) and H2O2 concentrations. The degradation products were also identified using gas chromatography-mass spectrometry method. The hydroxyl radical (HO.) was the leading species in charge of benzene degradation. The formation of HO. was strongly dependent on the generation of the organic compound radical (R.) and superoxide anion radical (O.). Benzene degradation products included hydroxylated derivatives of benzene (phenol, hydroquinone, benzoquinone, and catechol) and aliphatic acids (oxalic and fumaric acids). The proposed degradation pathways are consistent with radical formation and identified products. The investigation of selected matrix constituents showed that the Cl and HCO3 had inhibitory effects on benzene degradation. Natural organic matter (NOM) had accelerating influence in degrading benzene. The developed system was tested with groundwater samples and it was found that the Fe(III)-activated SPC has a great potential in effective remediation of benzene-contaminated groundwater while more further studies should be done for its practical application in the future because of the complex subsurface environment.

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Perchloroethylene (PCE) oxidation by percarbonate in Fe2+-catalyzed aqueous solution: PCE performance and its removal mechanism

Cited by 76 publications

References 41 publications

An efficient catalytic degradation of trichloroethene in a percarbonate system catalyzed by ultra-fine heterogeneous zeolite supported zero valent iron-nickel bimetallic composite

An efficient catalytic degradation of trichloroethene in a percarbonate system catalyzed by ultra-fine heterogeneous zeolite supported zero valent iron-nickel bimetallic composite

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Benzene oxidation by Fe(III)-activated percarbonate: matrix-constituent effects and degradation pathways

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