Trichloroethylene Degradation by Zero Valent Iron Activated Persulfate Oxidation

Liang, Chenju; Lai, Ming-Chun

doi:10.1089/ees.2007.0174

Cited by 133 publications

(42 citation statements)

References 18 publications

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“…(3) and (4) ) by ferrous salts to the system. In 2008, Liang et al [13] firstly reported the use of ZVI as a source for Fe 2+ activated PS oxidation of trichloroethylene (TCE). The catalytic properties of ZVI for the degradation of 2,4-dinitrotoluene [14], spent caustic [15] and sulfamethoxazole [16] in the presence of PS were also tested.…”

Section: åàmentioning

confidence: 99%

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Degradation of chloramphenicol by persulfate activated by Fe 2+ and zerovalent iron

Nie

Yan

et al. 2015

Chemical Engineering Journal

198

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h i g h l i g h t sThe removal efficiencies for CAP in water by PS activated by Fe 2+ and ZVI were studied.CAP was effectively removed by the ZVI-PS system at a broad pH range of 3-10. CAP removal was significantly influenced by operational parameters.The ZVI-PS system shows potential prospects in wastewater or even concentrated wastewater treatment. An oxidation pathway was proposed for CAP removal by the ZVI-PS system. a r t i c l e i n f o , and HA significantly inhibited CAP decomposition. Up to 92.8%, 94.7%, and 75.7% of CAP were removed from the filtrate, permeate, and retentate phases of wastewater, respectively. This result indicated that the ZVI-PS system can significantly remove CAP from wastewater and even concentrated wastewater. The intermediate products during oxidation were identified, and the degradation pathways of CAP were tentatively proposed.

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Section: åàmentioning

confidence: 99%

“…3b, soluble Fe 2+ can be slowly and continuously produced from the corrosion of ZVI in the presence of PS, which allowed the highly efficient decomposition of CAP in the ZVI-PS system. PS and ZVI were gradually consumed throughout the reaction because of the slow release of Fe 2+ from the self-corrosion of ZVI [13].…”

Section: Effect Of Initial Ps Dosagementioning

confidence: 99%

Degradation of chloramphenicol by persulfate activated by Fe 2+ and zerovalent iron

Nie

Yan

et al. 2015

Chemical Engineering Journal

198

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“…When DNAPLs are released into aquifer from underground storage tanks, they will infiltrate through the entire aquifer and form residual ganglia and pools of DNAPLs due to their large densities, high interfacial tension, and low solubility. The residual ganglia and pools of DNAPLs can serve as long-term sources of groundwater contamination which are harmful to the subsurface environment and human beings (Bob et al, 2008;Liang and Lai, 2008;Liang and Hsieh, 2015). Consequently, it is very important to explore DNAPL migration in aquifers and associated remediation of groundwater contamination.…”

Section: Introductionmentioning

confidence: 99%

Effects of microarrangement of solid particles on PCE migration and its remediation in porous media

2018

Hydrol. Earth Syst. Sci.

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Abstract. Groundwater can be stored abundantly in granulacomposed aquifers with high permeability. The microstructure of granular materials has important effect on the permeability of aquifers and the contaminant migration and remediation in aquifers is also influenced by the characteristics of porous media. In this study, two different microscale arrangements of sand particles are compared to reveal the effects of microstructure on the contaminant migration and remediation. With the help of fractal theory, the mathematical expressions of permeability and entry pressure are conducted to delineate granular materials with regular triangle arrangement (RTA) and square pitch arrangement (SPA) at microscale. Using a sequential Gaussian simulation (SGS) method, a synthetic heterogeneous site contaminated by perchloroethylene (PCE) is then used to investigate the migration and remediation affected by the two different microscale arrangements. PCE is released from an underground storage tank into the aquifer and the surfactant is used to clean up the subsurface contamination. Results suggest that RTA can not only cause more groundwater contamination, but also make remediation become more difficult. The PCE remediation efficiency of 60.01-99.78 % with a mean of 92.52 and 65.53-99.74 % with a mean of 95.83 % is achieved for 200 individual heterogeneous realizations based on the RTA and SPA, respectively, indicating that the cleanup of PCE in aquifer with SPA is significantly easier. This study leads to a new understanding of the microstructures of porous media and demonstrates how microscale arrangements control contaminant migration in aquifers, which is helpful to design successful remediation scheme for underground storage tank spill.

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“…ZVI does not only provide Fe 2+ but also participates in the activation of PS. Generation of Fe 2+ from Fe 3+ is another advantage of using ZVI (Bremner et al 2006;Liang and Lai 2008). Nanoscale ZVI (nZVI) is more effective and reactive compared to the micro-ZVI due to its large surface area (Crane and Scott 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of pH and Anions on the Generation of Reactive Oxygen Species (ROS) in nZVI-rGo-Activated Persulfate System

Ahmad

et al. 2015

Water Air Soil Pollut

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In this study, nanosized zero-valent iron-reduced graphene oxide (nZVI-rGO)-activated persulfate (PS) was used to investigate the generation of reactive oxygen species (ROS) for the degradation of trichloroethylene (TCE) in the aqueous solution. More than 98 % of TCE was degraded within 2 min under experimental conditions. The generation of ·OH increased when the pH was shifted toward the basic region while ·SO 4 − radicals' intensity increased in the acidic pH. Different scenarios have been observed in ·O 2 − generation in the neutral and strong basic pH and decreased in acidic or slightly basic pH. In addition, the intensity of ·OH was increased with the addition of HCO 3 − (10 mM) and NO 3 − (100 mM) but decreased in the presence of Cl − (10 and 100 mM), HCO 3 − (100 mM), and NO 3 − (10 mM). The degradation of anisole, probe for both ·OH and ·SO 4 − , was slightly enhanced by 10 mM NO 3 − anions but decreased in 100 mM salt solution. ·O 2 − intensity was increased while HCO 3 − (10 and 100 mM) and NO 3 − (100 mM) anions were used.nZVI-rGO-activated PS process could remove TCE in aqueous effectively, and the ROS generation and intensity were influenced by solution pH values and anions.

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Trichloroethylene Degradation by Zero Valent Iron Activated Persulfate Oxidation

Cited by 133 publications

References 18 publications

Degradation of chloramphenicol by persulfate activated by Fe 2+ and zerovalent iron

Degradation of chloramphenicol by persulfate activated by Fe 2+ and zerovalent iron

Effects of microarrangement of solid particles on PCE migration and its remediation in porous media

Effects of pH and Anions on the Generation of Reactive Oxygen Species (ROS) in nZVI-rGo-Activated Persulfate System

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