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|標題:||Synthesis of granular activated carbon/zero valent iron composites for simultaneous adsorption/dechlorination of trichloroethylene||作者:||Tseng, Hui-Hsin
|關鍵字:||Reactive activated carbon;Chlorinated solvent;Reduction;Groundwater remediation;Waste water treatment||出版社:||Elsevier B.V.||Project:||Journal of Hazardous Materials, Volume 192, Issue 2, Page(s) 500-506.||摘要:||
The coupling adsorption and degradation of trichloroethylene (TCE) through dechlorination using synthetic granular activated carbon and zerovalent iron (GAC-ZVI) composites was studied. The GAC-ZVI composites were prepared from aqueous Fe2+ solutions by impregnation with and without the use of a PEG dispersant and then heated at 105 ◦C or 700 ◦C under a stream of N2. Pseudo-first-order rate constant data on the removal of TCE demonstrates that the adsorption kinetics of GAC is similar to those of GAC-ZVI composites. However, the usage of GAC-ZVI composites liberated a greater amount of Cl than when ZVI was used alone. The highest degree of reductive dechlorination of TCE was achieved using a GAC-ZVI700P composite (synthesized using PEG under 700 ◦C). A modified Langmuir-Hinshelwood rate law was employed to depict the behavior of Cl liberation. As a result, a zero-order Cl liberation reaction was observed and the desorption limited TCE degradation rate constant decreased as the composite dosage was increased. The GAC-ZVI composites can be employed as a reactive GAC that is not subject to the limitations of using GAC and ZVI separately.
|Appears in Collections:||環境工程學系所|
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