kaolinite also contains hydroxylated edge and defect sites, which may be important points for chromate adsorption in soils and subsurface materials.
Kaolinite adsorbs acid anions, including SO42- , MoO42- ,
PO43- , H3BO 3 and B(OH)4-
The favored adsorption mechanism is surface complexation by aluminol groups (A1OH) exposed primarily on crystal edges.