Trichloroethylene Reduction on Zero Valent Iron: Probing Reactive versus Nonreactive Sites

Comparison of reductive dechlorination of p-chlorophenol using Fe0 and nanosized Fe0

“…That is to say, the reductive rate decreased when the initial concentration rose. Deng et al [22] suggested that there were two types of surface sites on the iron: the reactive sites responsible for reduction, and the non reactive sites responsible for the bulk of adsorption. They found that the reactive site density was estimated to be only 2% of the total surface sites.…”

Effect of SO on 1,1,1‐Trichloroethane Degradation by Fe0 in Aqueous Solution

“…At initial pH 6.0, the concentration of Cl − increased linearly with time to 0.036 mM (Figure 2), indicating TCA was degraded rather than adsorbed onto Fe 0 surface (Deng et al 2003; Zhang et al 2008; Lim et al 2009). As the degradation of TCA proceeded, the soluble iron ions increased quickly before 180 min reaction time and then reached 0.045 mM gradually, implying that the dissolution of Fe 0 is responsible for TCA degradation.…”

“…The reported half-lives of TCA for neutral hydrolysis at room-temperature are between 180 d and 2.8 years (Jeffers et al 1989), implying the neutral hydrolysis can be neglected during such a relatively short reaction time (420 min). At initial pH 6.0, the concentration of Cl − increased linearly with time to 0.036 mM (Figure 2), indicating TCA was degraded rather than adsorbed onto Fe 0 surface (Deng et al 2003;Zhang et al 2008;Lim et al 2009). As the degradation of TCA proceeded, the soluble iron ions increased quickly before 180 min reaction time and then reached 0.045 mM gradually, implying that the dissolution of Fe 0 is responsible for TCA degradation.…”

Dechlorination of short chain chlorinated paraffins by nanoscale zero-valent iron

“…The complexation between HA and the formed Fe 2+ may inhibit 2,4-DCP dechlorination by suppressing iron corrosion or occupying the active surface sites. There may be two types of surface sites on the NZVI: the reactive sites responsible for the reduction and the nonreactive sites for the adsorption [29]. The reactive site density was generally estimated to be only 2% of the total surface sites.…”