Adsorption of copper onto goethite in aqueous systems

Metal ion binding to iron oxides

“…The availability of a robust and extensive set of parameters for a given model is therefore highly desirable. Macroscopic data (not shown here) obtained with the same surface loading (i.e., sorption edge experiments) show that goethite and HFO have comparable pH sorption edges for Pb, Cu, and Cd (sorption egdes from: Benjamin, 1978;Leckie et al, 1980;Benjamin and Bloom, 1981;Benjamin and Leckie, 1981 for HFO and from: Balistrieri and Murray, 1982;Johnson, 1990;Kooner, 1992 for goethite). Conversely, Zn sorption edges for the two oxides are different.…”

“…For instance, no salt effect is observed during Pb and Cd (Hayes and Leckie, 1987) or Cu and Zn sorption (Kooner, 1992). However, in the case of Cd, some recent EXAFS results (Bargar, personal communication) suggest that the so-called outer-sphere complexes (i.e., Cd located on the same electrostatic plane as K or Na) could also be important.…”

“…95 Bargar et al (1998) 95 Barrow et al (1981) 90 Djafer et al (1989) 90 Hayes and Leckie (1987) 90 Johnson (1990) 90 Kooner (1992) 95 Kooner (1993) 95 Mckenzie (1980) 90 Padmanabham (1983) 97 Robertson (1996) Spark et al (1995) 90 Trivedi et al (2001) Venema et al (1996b 90 Villalobos et al (2001) 95…”

Metastable-Equilibrium Adsorption Theory

“…Polypropylene containers were used 1ЊC for 12 or 20 days (for Zn and Cd adsorption, respecthroughout the experiments in order to avoid the wall adsorp-tively). Then, samples were centrifuged (4000 rpm for 20 tion on glass at low metal concentrations (17,18). The most min) and the supernatants removed and analyzed for truly serious potential artifact of nonsettling colloids or the third dissolved Zn or Cd concentrations using differential pulse phase (i.e., colloid particles that remain in the liquid phase polarography.…”

“…Goethite (a-FeOrOH) was prepared by hydrolysis and aging of a ferric nitrate solution, according to the method The remaining particles in each tube were resuspended in described by Atkinson et al (25) and later used by other an equal volume (30 ml) of the same buffer solution used researchers (17,(26)(27)(28). X-ray diffraction analysis of the in the adsorption experiment.…”