Destruction of organohalides in water using metal particles. Carbon tetrachloride/water reactions with magnesium, tin and zinc
Conference
·
OSTI ID:126420
- Kansas State Univ., Manhattan, KS (United States)
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 has 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 CHCl{sub 3}, CO{sub 2}, SnO{sub 2}, and HCl with smaller amounts of 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}, CH{sub 2}Cl{sub 2}, and CH{sub 3}Cl as intermediate products. Thus, Sn and Zn behave quite differently with the final carbon containing product with Zn being CH{sub 4}, but with Sn being 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). However, conventional Zn dust and Sn granules were also effective, only with lower reaction rates. These reactions, possible mechanisms, and material balances will be discussed.
- OSTI ID:
- 126420
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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