Degradation of trichloroethylene by Fe(II) chelated with cross-linked chitosan in a modified Fenton reaction

Lee, Young-Min; Lee, Woojin

doi:10.1016/j.jhazmat.2010.01.062

Cited by 79 publications

(19 citation statements)

References 36 publications

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“…TCE is listed by the US Environmental Protection Agency (US EPA) as a priority pollutant and with a Maximum Contaminant Limit of 5 μg L −1 . Methods for removal of TCE from contaminated groundwater include biological transformation (e.g., Li et al 2011, Semkiw and Barcelona 2011, Tiehm and Schmidt 2011), chemical oxidation (e.g., Teel et al 2001, Yamazaki et al 2001, Waldemer et al 2007, Lee and Lee 2010, Tsai et al 2011, Yue-hua et al 2011, Yuan et al 2012a) reduction by zero valent iron (e.g., Li et al 2003, Liu et al 2006, Philips et al 2010, Petersen et al 2012) and palladium-based materials (e.g., Lowry and Reinhard 2001, Ma et al 2012, Lin et al 2009, He et al 2007, Wu and Richie 2006), photocatalytic degradation using TiO 2 catalyst (e.g., Che et al 2011, Farooq et al 2009) and ultrasonically enhanced oxidation (e.g., Rashid and Sato 2012, Ayyilidiz et al 2007, Destaillats et al 2001). Although these methods have advantages, there are limitations including high operating cost, long reaction time, and incomplete removal or accumulation of toxic byproducts.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical transformation of trichloroethylene in aqueous solution by electrode polarity reversal

et al. 2014

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Electrode polarity reversal is evaluated for electrochemical transformation of trichloroethylene (TCE) in aqueous solution using flow-through reactors with mixed metal oxide electrodes and Pd catalyst. The study tests the hypothesis that optimizing electrode polarity reversal will generate H2O2 in Pd presence in the system. The effect of polarity reversal frequency, duration of the polarity reversal intervals, current intensity and TCE concentration on TCE removal rate and removal mechanism were evaluated. TCE removal efficiencies under 6 cycles h−1 were similar in the presence of Pd catalyst (50.3%) and without Pd catalyst (49.8%), indicating that Pd has limited impact on TCE degradation under these conditions. The overall removal efficacies after 60 min treatment under polarity reversal frequencies of 6, 10, 15, 30 and 90 cycles h−1 were 50.3%, 56.3%, 69.3%, 34.7% and 23.4%, respectively. Increasing the frequency of polarity reversal increases TCE removal as long as sufficient charge is produced during each cycle for the reaction at the electrode. Electrode polarity reversal shifts oxidation/reduction and reduction/oxidation sequences in the system. The optimized polarity reversal frequency (15 cycles h−1 at 60 mA) enables two reaction zones formation where reduction/oxidation occurs at each electrode surface.

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Section: Introductionmentioning

confidence: 99%

Electrochemical transformation of trichloroethylene in aqueous solution by electrode polarity reversal

et al. 2014

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“…2001 at 100 rpm [27] at various times. The photo-Fenton process was performed in 2-liter Pyrex glass photo-reactor (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Municipal solid waste landfill leachate treatment by fenton, photo-fenton and fenton-like processes: Effect of some variables

Zazouli

Yousefi

Eslami

et al. 2012

J Environ Health Sci Engineer

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Advanced oxidation processes like Fenton and photo-Fenton have been effectively applied to oxidize the persistent organic compounds in solid waste leachate and convert them to unharmful materials and products. However, there are limited data about application of Fenton-like process in leachate treatment. Therefore, this study was designed with the objective of treating municipal landfill leachate by Fenton, Fenton-like and photo–Fenton processes to determine the effect of different variables, by setting up a pilot system. The used leachate was collected from a municipal unsanitary landfill in Qaem-Shahr in the north of Iran. Fenton and Fenton-like processes were conducted by Jar-test method. Photo-Fenton process was performed in a glass photo-reactor. In all processes, H2O2 was used as the oxidant. FeSO4.7H2O and FeCl3.6H2O were used as reagents. All parameters were measured based on standard methods. The results showed that the optimum concentration of H2O2 was equal to 5 g/L for the Fenton-like process and 3 g/L for the Fenton and photo-Fenton processes. The optimum ratio of H2O2: Fe+2/Fe+3 were equal to 8:1 in all processes. At optimum conditions, the amount of COD removal was 69.6%, 65.9% and 83.2% in Fenton, Fenton-like and photo–Fenton processes, respectively. In addition, optimum pH were 3, 5 and 3 and the optimum contact time were 150, 90 and 120 minutes, for Fenton, Fenton-like and photo–Fenton processes, respectively. After all processes, the biodegradability (BOD5/COD ratio) of the treated leachate was increased compared to that of the raw leachate and the highest increase in BOD5/COD ratio was observed in the photo-Fenton process. The efficiency of the Fenton-like process was overally less than Fenton and photo-Fenton processes, meanwhile the Fenton-like process was at higher pH and did not show problems.

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“…Compared with the classical homogenous Fenton catalyst (optimal pH value for reaction is about 3), using CS/HA as the supporter to load Fe 3 O 4 as a heterogeneous Fenton catalyst indeed extended the pH range for dye removal. According to the Haber-Weiss circle, the increasing of hydroxide ions caused by the increasing of pH would slow down the Fenton-like reaction and produced less OH•, making the dye degradation decreased and thus the removal efficiency [20,31]. Since the real sample pH was about 5 during the wool dyeing process when AY220 was used, pH 5 was thus convenient for practical use.…”

Section: Effect Of Ph and Catalyst Dosagementioning

confidence: 99%

“…However, raw CS cannot stand durative attack of •OH and is lack of enough mechanic strength, thus affecting its degradation efficiency [19]. Glutaraldehyde (GLA) has been then used as a cross-linking agent to stabilize CS, and thus cross-linked CS-based catalysts have been developed with improved degradation efficiency of organic contaminants [20,21]. But these catalysts are not able to efficiently adsorb the released metal ions from dye degradation, since the amine groups (main adsorption sites for metal ions adsorption) of CS have almost been occupied by GLA or loaded iron species.…”

Section: Introductionmentioning

confidence: 99%

Chitosan/hydroxyapatite/Fe3O4 magnetic composite for metal-complex dye AY220 removal: Recyclable metal-promoted Fenton-like degradation

Hou

Shi

et al. 2016

Microchemical Journal

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Cross-linked Chitosan (CS) loaded with iron species has been widely used as heterogeneous Fenton catalysts for organic contaminants removal. In comparison with raw-CS based Fenton catalysts, it exhibited an improved degradation efficiency due to the stabilization of cross-linking agents. With cross-linking, however, most reactive sites of CS were occupied by cross-linking agents, making its capability decreased sharply for adsorbing the released metal ions from metal-complex dye degradation. In this work, in order to efficiently adsorb the released metal ions from metal-complex dyes and avoid a secondary pollution, a new CS-based heterogeneous Fenton catalyst (Chitosan/Hydroxyapatite/Fe 3 O 4 magnetic composite) was developed for AY220 (a model of metal-complex dyes) removal. Hydroxyapatite (HA), a well-known biocompatible material with strong ability for metal ions adsorption, was introduced to combine with CS for Fe 3 O 4 loading. The total removal efficiency of AY220 by the magnetic composite can reach as high as 95.0%, and the degradation efficiency of AY220 was greatly enhanced compared with a raw-CS based catalyst and bare Fe 3 O 4. Meanwhile, the composite can efficiently adsorb Co 2+ released from AY220 degradation, which can further promote the degradation of AY220. After five recyclable runs of the composite, the degradation efficiency of AY220 increased from 25.1% to 45.6%, demonstrating its potential usefulness in recyclable degradation of metal-complex dyes.

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Degradation of trichloroethylene by Fe(II) chelated with cross-linked chitosan in a modified Fenton reaction

Cited by 79 publications

References 36 publications

Electrochemical transformation of trichloroethylene in aqueous solution by electrode polarity reversal

Electrochemical transformation of trichloroethylene in aqueous solution by electrode polarity reversal

Municipal solid waste landfill leachate treatment by fenton, photo-fenton and fenton-like processes: Effect of some variables

Chitosan/hydroxyapatite/Fe3O4 magnetic composite for metal-complex dye AY220 removal: Recyclable metal-promoted Fenton-like degradation

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