Can or cannot green rust reduce chlorinated ethenes?

TY - GEN

T1 - Can or cannot green rust reduce chlorinated ethenes?

AU - Mangayayam, Marco C.

AU - Dideriksen, Knud

AU - Tobler, Dominique J.

PY - 2018

Y1 - 2018

N2 - Green rusts (GRs) are Fe 2+ , Fe 3+ layered double hydroxides that are widely investigated for the reduction of inorganic and organic pollutants in soils and groundwaters. Of particular interest is the use of GRs for the reduction of chlorinated ethenes, but existing literature shows contrasting results. Here, we tested 4 GRs (with different interlayer and hydroxide sheet modifications) in reactions with 3 different chlorinated ethenes (tetra-, tri-, and cis-dichloroethylene) for up to 10 months. Our results show that none of the freshly synthesized and untreated GRs can reduce the here tested chlorinated ethenes to any significant extent, corroborated by the lack of degradation products after 10 months and the absence of any significant volatilization. This is in stark contrast to previous literature, which reported that GR can degrade these chlorinated ethenes. The absence of reaction in our experiments is explained by having equilibrated GR suspensions, where the affinity of chlorinated ethenes for GR surfaces is extremely low.

AB - Green rusts (GRs) are Fe 2+ , Fe 3+ layered double hydroxides that are widely investigated for the reduction of inorganic and organic pollutants in soils and groundwaters. Of particular interest is the use of GRs for the reduction of chlorinated ethenes, but existing literature shows contrasting results. Here, we tested 4 GRs (with different interlayer and hydroxide sheet modifications) in reactions with 3 different chlorinated ethenes (tetra-, tri-, and cis-dichloroethylene) for up to 10 months. Our results show that none of the freshly synthesized and untreated GRs can reduce the here tested chlorinated ethenes to any significant extent, corroborated by the lack of degradation products after 10 months and the absence of any significant volatilization. This is in stark contrast to previous literature, which reported that GR can degrade these chlorinated ethenes. The absence of reaction in our experiments is explained by having equilibrated GR suspensions, where the affinity of chlorinated ethenes for GR surfaces is extremely low.

KW - chlorianted solvents

KW - green rust

KW - remediation

U2 - 10.1016/j.egypro.2018.07.022

DO - 10.1016/j.egypro.2018.07.022

M3 - Conference article

AN - SCOPUS:85058824403

SN - 1876-6102

VL - 146

SP - 173

EP - 178

JO - Energy Procedia

JF - Energy Procedia

T2 - 2018 International Carbon Conference, ICC 2018

Y2 - 10 September 2018 through 14 September 2018

ER -