Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7483637 | Journal of Environmental Management | 2014 | 17 Pages |
Abstract
Stable nanoscale zero-valent iron (NZVI) particles have been developed to remediate chlorinated compounds. The degradation kinetics and efficiency of trichloroethylene (TCE) by a commercial stabilized NZVI with Na-acrylic copolymer (acNZVI) were investigated and compared with those by laboratory-synthesized NZVI and carboxymethyl cellulose (CMC)-stabilized NZVI particles. Results show that the degradation of TCE by acNZVI was faster than that by NZVI and CMC-NZVI. Increase in temperature enhanced the degradation rate and efficiency of TCE with acNZVI. The activation energy of TCE degradation by acNZVI was estimated to be 23Â kJ/mol. The degradation rate constants of TCE decreased from 0.064 to 0.026Â minâ1 with decrease in initial pH from 9.03 to 4.23. Common groundwater anions including NO3â, Clâ, HCO3â, and SO42â inhibited slightly the degradation efficiencies of TCE by acNZVI. The Na-acrylic copolymer-stabilized NZVI, which exhibited high degradation kinetics and efficiency, could be a good remediation agent for chlorinated organic compounds.
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Authors
Meng-yi Chen, Yuh-fan Su, Yang-hsin Shih,