Effects of various ions on the dechlorination kinetics of hexachlorobenzene by nanoscale zero-valent iron.

Yuh-fan Su, Chung-Yu Hsu, Yang-hsin Shih

Department of Agricultural Chemistry, National Taiwan University, Taipei 106, Taiwan.

Chemosphere 2012 Sep

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The effect of several anions and cations normally co-present in soil and groundwater contamination sites on the degradation kinetics and removal efficiency of hexachlorobenzene (HCB) by nanoscale zero-valent iron (NZVI) particles was examined. The degradation kinetics was not influenced by the HCO(3)(-), Mg(2+), and Na(+) ions. It was enhanced in the presence of the Cl(-) and SO(4)(2-) ions due to their corrosion promotion. The NO(3)(-) competes with HCB so it inhibits the degradation reaction. The Fe(2+) ions would inhibit the degradation reaction due to passivation layer formed, while it was enhanced in the presence of Cu(2+) ions resulted from the reduced form of copper on NZVI surfaces. These observations lead to a better understanding of HCB dechlorination with NZVI particles and can facilitate the remediation design and prediction of treatment efficiency of HCB at remediation sites. Copyright © 2012 Elsevier Ltd. All rights reserved.

Citation

Yuh-fan Su, Chung-Yu Hsu, Yang-hsin Shih. Effects of various ions on the dechlorination kinetics of hexachlorobenzene by nanoscale zero-valent iron. Chemosphere. 2012 Sep;88(11):1346-52