Effects of various ions on the dechlorination kinetics of hexachlorobenzene by nanoscale zero-valent iron.
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.
Department of Agricultural Chemistry, National Taiwan University, Taipei 106, Taiwan.
Yuh-fan
YF
Su
Chung-Yu
CY
Hsu
Yang-hsin
YH
Shih
D006581:Hexachlorobenzene / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics
D007477:Ions; D006581:Hexachlorobenzene; D007501:Iron