Destruction of organohalides in water using metal particles: Carbon tetrachloride/water reactions with magnesium, tin and zinc
- Kansas State Univ., Manhattan, KS (United States). Dept. of Chemistry
As a possible method for degrading chlorocarbons in contaminated water supplies, the reactions of metallic magnesium, tin and zinc with CCl{sub 4}/H{sub 2}O mixtures have been studied. In the case of Mg, oxidation by water overwhelmed the Mg-CCl{sub 4} reaction. However, Sn and Zn were successfully used to degrade CCl{sub 4}. Major products in the Sn/CCL{sub 4}/H{sub 2}O system were CO{sub 2}, SnO{sub 2} and HCl with smaller amounts of CHCl{sub 3} and CH{sub 2}Cl{sub 2}. In the case of Zn/CCl{sub 4}/H{sub 2}O, major products were ZnCl{sub 2}, Zn(OH){sub 2}, and CH{sub 4} with CHCl{sub 3} and CH{sub 2}Cl{sub 2} as intermediate products. Thus, Sn and Zn behave quite differently. The final carbon containing product with Zn is CH{sub 4}, while with Sn it is CO{sub 2}. This is rationalized by the competing reactions of a possible intermediate Cl{sub 3}CMCl, which can be protonated by H{sub 2}O to give CHCl{sub 3} or eliminate CCl{sub 2} (that subsequently reacts with water to form CO{sub 2} and HCl). Metal morphology and surface area are also important, and the most active metal samples were prepared by a metal vapor-solvent codeposition method (cryo-particles). Conventional Zn dust and Sn granules were also effective, but had lower reaction rates.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States); Department of the Army, Washington, DC (United States); Environmental Protection Agency, Washington, DC (United States)
- OSTI ID:
- 491026
- Report Number(s):
- CONF-9406250--
- Country of Publication:
- United States
- Language:
- English
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