Competing TCE and cis-DCE degradation kinetics by zero-valent iron—experimental results and numerical simulation

Schäfer, Dirk; Köber, Ralf; Dahmke, Andreas

doi:10.1016/s0169-7722(02)00239-5

Cited by 42 publications

(37 citation statements)

References 16 publications

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“…zone between 5 and 10 cm from the column inlet are likely due to processes not included or not adequately represented in the reaction network. The BRNS performs therefore equally well as the 'TBC' model of Schäfer et al (1998a), a widely recognized reactive transport model in the area of contaminant hydrology (Thullner and Schäfer, 1999;Schäfer, 2001;Schäfer et al, 2003).…”

Section: Performance Of the Brnsmentioning

confidence: 71%

Modeling the impact of microbial activity on redox dynamics in porous media

Thullner

Cappellen

Regnier

2005

Geochimica et Cosmochimica Acta

103

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Section: Performance Of the Brnsmentioning

confidence: 71%

Modeling the impact of microbial activity on redox dynamics in porous media

Thullner

Cappellen

Regnier

2005

Geochimica et Cosmochimica Acta

103

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“…This result is comparable to the dechlorination mechanism proposed by Cheng et al (1997) in which a dehalogenation reaction occurs on the surface of a bimetallic reductant. Surface saturation reactions were also observed in several studies on reactions between chlorinated organics and solid reductants such as zero valent iron (ZVI) (Schafer et al 2003;Janda et al 2004;Arnold and Roberts 2000) and cement slurries containing Fe(II) (Hwang and Batchelor 2002) and GR (Lee and Batchelor 2002).…”

Section: Effect Of Initial Pce Concentrationmentioning

confidence: 80%

Reductive Dechlorination of Tetrachloroethylene by Green Rusts Modified with Copper

Choi

Batchelor

Chung

2010

Water Air Soil Pollut

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Reductive dechlorination of tetrachloroethylene (PCE) by green rust modified with copper (GR(Cu)) was investigated using a batch reactor system. Four different forms of GRs (GR-Cl, GR-SO 4 , GR-CO 3 , and GR-F) were synthesized by partial air oxidation of Fe(OH) 2 and used in reductive dechlorination. The addition of Cu(II) into GRs produced 100-nm particles on the surface of GRs, which were considered to be metallic Cu and transformed a portion of GR to magnetite. Concentration of Fe(II) in the liquid phase increased and concentration of Fe(II) in the solid phase decreased during the modification process and the extent of these changes was dependent on the amount of Cu(II) added. The most reactive of the modified GRs was GR-F(Cu), which reacted with PCE at a rate that was 80 times faster than that of GR-Cl(Cu). The rate of PCE degradation by GR-F(Cu) was strongly dependent on pH with higher rates at higher pH over the range of pH 7.5-11. Increasing concentrations of Cu(II) over the range of 0 to 5 mM increased rate constants. The rate of dechlorination of PCE by GR-F(Cu) showed surface saturation behavior with respect to PCE concentration.

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“…The specific surface area of the nanoparticle (10-100 nm) is 10 times larger than that of a micron-scale particle and the reactivity is significantly enhanced [1]. In addition, palladium (Pd) or nickel (Ni) doped on nZVI enhances the transformation rate of the target chemical and the bimetallic system can reduce the production of toxic intermediates [2][3][4][5]. Studies with nZVI are mainly focused on the dechlorination of chlorinated compounds such as trichloroethylene (TCE), perchloroethylene (PCE), chloro-phenols, polychlorinated biphenyls (PCBs), and so on [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%