Interaction of green rust and zero-valent iron during dechlorination of PCE
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The interactions between a sulfate GR and ZVI during dechlorination of tetrachloroethylene (PCE) was evaluated to determine if combinations of green rusts and ZVI are more effective as reductant than each reductant acting individually. The concentration of PCE on the surface can be expressed by a Langmuir isotherm in which the maximum sorption capacity is expressed as the concentration of reductive capacity. The concentration of reductive capacity represents the concentration of active sites where PCE can sorb and be reduced. The "No-Interaction" model predicted slower removal than was observed, which indicated that ZVI and GR-SO4 interact synergistically in this system. The observed behavior was consistent with the GR-SO4 surface being more reactive than the ZVI surface, but limited in reductive capacity. The fact that forming GR in the presence of ZVI did not produce combined reductants that were more active indicates that the interaction between GR and ZVI may not require intimate contact. Similar results were obtained with ZVI that had not been acid-washed. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).