The dechlorination of chlorinated hydrocarbons by Si(O) in the presence of heavy metals was studied to understand the feasibility of coupled reduction of chlorinated hydrocarbons and heavy metal ions. A complete dechlorination of CCl 4 was observed within 10 min at pH 8.5. Addition of heavy metal ions including Cu(II), Co(II), and Ni(II) lowered the production rate of hydrogen gas and dechlorination efficiency of CCl 4, due to the competition of active sites between CCl 4 and metal ions. However, Ni(II) promoted the dechlorination efficiency and rate of tetrachloroethylene. XPS and ICP-MS results showed that Ni(II) was transformed to zero-valent metal to enhance the dechlorination of chlorinated hydrocarbons. This is an abstract of a paper presented at the 229th ACS National Meeting (San Diego, CA 3/13-17/2005).
ASJC Scopus subject areas
- Chemical Engineering(all)