Bimetallic Nanoparticles - Nanotechnologies for Water Environment Applications - page 179

Table 7.5 Removal of selected metallic ions by iron nanoparticles.
Metallic
Ions

Metal State on
Fe Surface

Removal Processes References

Zn(II) Zn(II) Adsorption, surface

complex formation

Li and Zhang, 2007

As(V) As(V), As(III) Adsorption, surface

complexation, chemical
reduction

Yuan and Lien, 2006; Kanel et al.,
2006

As(III) As(V), As(III) Surface complexation,

chemical oxidation

Kanel et al., 2005

Cd(II) Cd(II) Adsorption, surface

complex formation

Li and Zhang, 2007

Cr(VI) Cr(III) Chemical reduction Ponder et al., 2000; Alowitz and

Scherer, 2002; Li and Zhang,
2007; Lien et al., 2007

Cu(II) Cu(0), Cu(I) Chemical reduction Li and Zhang, 2007; Lien et al.,

2007

Ni(II) Ni(0), Ni(II) Chemical reduction,

adsorption

Li and Zhang, 2007

Pb(II) Pb(0), Pb(II) Chemical reduction,

adsorption

Ponder et al., 2000; Li and Zhang,
2007; Lien et al., 2007

Ag(I) Ag(0) Chemical reduction Li and Zhang, 2007

Hg(II) Hg(0) Chemical reduction Li and Zhang, 2007

7.3.2.2 Dechlorination of Carbon Tetrachloride

Effects of heavy metals on the reaction rate of carbon tetrachloride degradation
by iron nanoparticles were evaluated in batch systems, each containing 25 mg/L of an
individual heavy metal in the presence of 2.5 g/L iron nanoparticles. Dechlorination of
carbon tetrachloride can be fitted well by pseudo-first order reaction kinetics (R 2 =
0.91-0.98). It was found that both Cu(II), and Pb(II) enhanced the rate of carbon
tetrachloride dechlorination by iron nanoparticles while the effect of As(V) was
negligible (Figure 7.13). Among them, Cu(II) exhibited the best enhanced effect, which