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A Study for Reductive Degradation and Surface Characteristics of Hexachloroethane by Iron Sulfide ($FeS,\;FeS_{2}$)  

Park Sang-Won (Faculty of Environmental Science and Engineering, Keimyung University)
Kim Sung-Kuk (Faculty of Environmental Science and Engineering, Keimyung University)
Heo Jae-Eun (Faculty of Environmental Science and Engineering, Keimyung University)
Publication Information
Journal of Soil and Groundwater Environment / v.11, no.5, 2006 , pp. 35-42 More about this Journal
Abstract
The following results were obtained in the reductive degradation of hexachloroethane (HCA), and surface characteristics by using iron sulfide ($FeS,\;FeS_{2}$) mediators. HCA was degraded to pentachloroethane (PCA), tetrachloroethylene(PCE), trichloroethylene(TCE) and cis-l,2-dichloroethylene (cis-1,2-DCE) by complicated pathways such as hydrogenolysis, dehaloelimination and dehydrohalogenation. FeS had more rapid degradation rates of organic solvent than $FeS_{2}$. In liquidsolid reaction, the reaction rates of organic solvents were investigated to explain surface characteristics of FeS and $FeS_{2}$.. To determine surface characteristics of FeS and $FeS_{2}$, the specific surface area and surface potential of each mineral was determined and the hydrophilic site ($N_{s}$) was calculated. The specific surface area ($107.0470m^{2}/g\;and\;92.6374m^{2}/g$) and the $pH_{ZPC}$ of minerals ($FeS\;PH_{ZPC}=7.42,\;FeS_{2},\;PH_{ZPC}=7.80$) were measured. The results showed that the Ns of FeS and $FeS_{2}$ were $0.053\;site/mm^{2}\;and\;0.205\;site/mm^{2}$, respectively. $FeS_{2}$ had more hydrophilic surface than FeS. In other words, FeS have more hydrophobic surface site than $FeS_{2}$.
Keywords
Reductive degradation; Chlorinated compounds; Iron sulfide; Hydrophilic & phobic site;
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