Heavy metals have found industrial, agricultural and military uses for several centuries of time. As a result they are now widely dispersed in a range of different forms, and there are environmental problems resulting from their mining, extraction, and purification. In many cases these metals are present as mixtures rather than as a metal residue in pure form. As a result, if these metals are to be recovered in pure form, it will be necessary for selective extraction processes to be developed. Because many heavy metals are toxic, they cannot be left unrecovered. However, since these metals have significant commercial value, it is realistic that economically justifiable methods can be developed for their separation and recovery from waste residues.
KeywordsHeavy Metal Precious Metal Macrocyclic Ligand Activate Carbon Adsorption Waste Pilis
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