The aim of this article is to review the biosorption of metal ions by different biosorbents, such as agriculture waste, fruit peels, industrial waste, fungi and alga. All these types were studied in this work using several parameters.
The maximum uptake of the metals (expressed by mg metal/g biosorbent) has been adopted as a criterion for the metal recovery efficiency. It has been concluded that pH is the most important parameters governing the efficiency of such process. This study is covering the literatures during the last two decades.

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