*6.2.1. Wastes of agricultural or food industry*

The wastes of agriculture or food industry includes agricultural byproducts as corn cobs, soya bean hulls, cotton seeds hulls [92] or fruit peels. They contain cellulosic material in their cell wall which is known to contain functional groups like phenolics or carboxylic. On the basis of cation exchange between functional groups and metal ions, the binding of metal ion with functional group results in biosorption and thus removal of metal ion from medium [49].
