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SYNTHESIS OF NANO-SIZED IRON FOR REDUCTIVE DECHLORINATION. 2. Effects of Synthesis Conditions on Iron Reactivities
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  • Journal title : Environmental Engineering Research
  • Volume 10, Issue 4,  2005, pp.174-180
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2005.10.4.174
 Title & Authors
SYNTHESIS OF NANO-SIZED IRON FOR REDUCTIVE DECHLORINATION. 2. Effects of Synthesis Conditions on Iron Reactivities
Song, Ho-Cheol; Carraway, Elizabeth R.; Kim, Young-Hun;
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 Abstract
Nano-sized iron was synthesized using borohydride reduction of in aqueous solution. A wide range of synthesis conditions including varying concentrations of reagents, reagent feeding rate, and solution pH was applied in an aqueous system under anaerobic condition. The reactivity of nano-sized iron from each synthesis was evaluated by reacting the iron with TCE in batch systems. Evidence obtained from this study suggest the reactivity of iron is strongly dependent on the synthesis solution pH. The iron reactivity increased as solution pH decreased. More rapid TCE reduction was observed for iron samples synthesized from higher initial concentration, which resulted in lower solution pH during the synthesis reaction. Faster feeding of solution to the solution resulted in lower synthesis solution pH and the resultant iron samples gave higher TCE reduction rate. Lowering the pH of the solution after completion of the synthesis reaction significantly increased reactivity of iron. It is presumed that the increase in the reactivity of iron synthesized at lower pH is due to less precipitation of iron (hydr)oxides or less surface passivation of iron.
 Keywords
zero-valent metals;nano-particle;pH;borate injection rate;reduction;dechlorination;
 Language
English
 Cited by
1.
SYNTHESIS OF NANO-SIZED IRON FOR REDUCTIVE DECHLORINATION. 1. Comparison of Aerobic vs. Anaeriobic Synthesis and Characterization of Nanoparticles,;;;

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