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Tannins are renewable materials, coming from multiple vegetable sources. A variety of biosorbents have been developed from tannins, including tannin resins, rigid foams, composites with mesoporous silica, cellulose, collagen, and magnetic adsorbents. These materials have shown an excellent ability to uptake heavy\u2010metal cations (Cd(II), Cu(II), Pb(II), Ni(II), Cr(III)), owning to the chelating ability provided by the plentiful adjacent hydroxyl groups. In addition, tannin\u2010adsorbents have shown exceptional ability to remove Cr(VI), and to uptake Au(III) and Pd(II) from strong acidic solutions, which has evident application in the recovery of precious metals from e\u2010wastes leaching. The fact that tannin\u2010adsorbents can reduce the oxidation state of these adsorbates to Cr(III) and to elemental species of Au and Pd is interesting. Adsorption of dyes, surfactants, pharmaceuticals and antimony is also feasible, but the removal of certain metalloid species, such as arsenic and phosphate, seems to be limited even after applying chemical modifications. This article presents a systematic review on the preparation of tannin\u2010adsorbents and their application in water decontamination and in the recovery of critical metals.<\/jats:p>","DOI":"10.1002\/biot.201900060","type":"journal-article","created":{"date-parts":[[2019,9,6]],"date-time":"2019-09-06T08:48:10Z","timestamp":1567759690000},"source":"Crossref","is-referenced-by-count":51,"title":["Tannin\u2010Adsorbents for Water Decontamination and for the Recovery of Critical Metals: Current State and Future Perspectives"],"prefix":"10.1002","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8568-8884","authenticated-orcid":false,"given":"S\u00edlvia C. 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