Effect of Iron Removal on Cobalt Sorption by Clays

Adsorption of heavy metal ions on soils and soils constituents

“…It was also found that Co adsorption by certain soils was increased by removal of Fe, which is believed to expose clay mineral surfaces that were more reactive than previously exposed Fe oxide surfaces [175]. Co sorption capacity of soils was found to highly correlate with Co content and surface area and to a lesser extent with Mn and clay contents and pH [176].…”

Soil contamination issues: past, present and future, a personal perspective

“…This research topic was pursued by Hodgson and Tiller over several years (Hodgson, 1960;Hodgson and Tiller, 1962;Tiller and Hodgson, 1962;Tiller et aI., 1963;Hodgson et aI., 1964;Hodgson, 1969). They studied the adsorption of mainly Co and Zn under standard conditions of excess Ca ions of constant ionic strength in order to virtually eliminate the electrostatic interactions of the trace metal ions with the pure mineral and separated soil clay fractions used.…”

Adsorption of Heavy Metals by Clay-Aluminum Hydroxide Complexes

“…McBride (1978a) reported an eightfold increase of the Cu adsorption by Georgia kaolinite after treatment with an acidified NaCI solution. Hodgson et al (1969) found that the effect of Fe removal on Co adsorption by soil clays was either insignificant or slightly positive. Cavallaro and McBride (1984) observed a pronounced decrease in the adsorption of heavy metal ions after removing the Fe hydroxides and Al hydroxides from a soil clay.…”