Dechlorination of chlorinated hydrocarbons by zero-valent silicon in the presence of metal ions

Chun chi Lee, Ruey an Doong, Yen jung Lai

Research output: Contribution to journalConference articlepeer-review

Abstract

The dechlorination of chlorinated hydrocarbons by Si0 in the presence of heavy metals was studied to understand the feasibility of coupled reduction of chlorinated hydrocarbons and heavy metal ions. Chloroform was the dominant product during the dechlorination processes. Analysis of metal ion concentrations in liquid phases by AAS showed that metal ions was sorbed onto the surface of silicon. Nearly complete degradation of PCE by Si0 was observed within 700 hr. Unlike the effect of Cu2+, Ni2+ enhanced the rate and efficiency of tetrachloroethylene (PCE) dechlorination. Rapid dechlorination of PCE was achieved within 190 hr when Ni2+ was amended into the Si0-H2O system, depicting that Ni2+ is an effective ion on enhancing the dechlorination rate of PCE. Trichloroethylene (TCE) was the major product of PCE dechlorination. However, the production of TCE was compound-dependent. The produced TCE in Si0-H2O system accumulated with time with the maximum concentration of 4.2 μM, which corresponded to 63% of PCE dechlorination. This is an abstract of a paper presented at the 229th ACS National Meeting (San Diego, CA 3/13-17/2005).

Original languageEnglish (US)
Pages (from-to)548-553
Number of pages6
JournalACS, Division of Environmental Chemistry - Preprints of Extended Abstracts
Volume45
Issue number1
StatePublished - 2005
Externally publishedYes
EventACS, Division of Environmental Chemistry - Preprints of Extended Abstracts - San Diego, CA, United States
Duration: Mar 13 2005Mar 17 2005

ASJC Scopus subject areas

  • Energy(all)

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