A starting source by a crosslinking Chitosanase chitinous and molybdenum, tungsten, vanadium, etc

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PROBLEM TO BE SOLVED : To provide a means capable of selectively recovering a rare metal such as molybdenum, tungsten and vanadium at low cost utilizing a bio-mass waste. SOLUTION : The adsorbing agent of a metal ion contains crosslinked chitosan having a structure that an inter-chitosan molecule is crosslinked by a crosslinking group and containing, as a glucosamine unit constituting a chitosan molecule, a unit represented by formula (I) : (wherein R1or R2each independently forms a crosslinking group by making together with R1or R2of the other glucosamine unit constituting a different chitosan molecule or represents a hydrogen provided that R1and R2are not simultaneously a hydrogen). COPYRIGHT : (C)2011, JPO&INPIT