Preparation of Chitosan Derivatives Containing Methylthiocarbamoyl and Phenylthiocarbamoyl Groups and Their Selective Adsorption of Copper(II) over Iron(III)

Adsorption of platinum(IV) and palladium(II) from aqueous solution by thiourea-modified chitosan microspheres

“…The selectivity for a specific metal ion depends on what kind of complexing agent is introduced into the polymeric chain. Several chelating ligands such as poly(ethylenimine) [4], ethylenediaminetetraacetic acid [11], thiocarbamonyl [12], crown ethers [13], l-lysine [14], and thiourea [15] were used to functionalize the crosslinked chitosan for adsorption of metal ions. According to the theory of hard and soft acids and bases (HSAB) defined by Pearson, metal ions will have a preference for complexing with ligands that have more or less electronegative donor atoms.…”

Adsorption Behavior of Cationic and Anionic Species on Chitosan Resins Possessing Amino Acid Moieties

“…Some researchers have applied chitosan to the separation and concentration of trace elements in water samples prior to trace analysis. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] Chitosan as a base material for the development of a chelating resin and an ion-exchange resin is of great interest due to its advantages, such as easy derivatization of its amino group, and being more hydrophilic than synthetic base materials, like polystyrene-divinylbenzene, polyethylene, and polyurethane, which provides a fast sorption kinetic of ionic species in aquatic media. 8 Therefore, novel chitosan resins possessing chelating moieties have been developed by using a cross-linked chitosan resin as a base material.…”

“…In order to develop high-performance chitosan resins prior to the collection and concentration of trace elements in water samples, some researchers have discussed the adsorption ability of cationic species, such as heavy metals and lanthanoids, by modifying of the cross-linked chitosan with chelating moieties, which are the IDA (iminodiacetic acid) group, EDTA (ethylenediaminetetraacetic acid) group, DTPA (diethylenetriaminepentaacetic acid) group, methylthiocarbamoyl group, phenylthiocarbamoyl group, 2-pyridylmethyl group, and 2-thienylmethyl group, and 3-(methylthio) propyl group. [9][10][11][12][13][14] By using the synthesized chitosan resins, the adsorption behavior of 3 -13 kinds of element in aqueous media has been investigated. In order to elucidate their adsorption ability, we must systematically examine the adsorption properties of multi elements under various pH conditions on chitosan resins.…”

Adsorption of platinum(IV) and palladium(II) from aqueous solution by magnetic cross-linking chitosan nanoparticles modified with ethylenediamine

“…Chelating agents with N and S groups are highly efficient for the selective sorption of precious metal ions. Several chelating ligands such as thiourea [7], thiocarbamonyl [16], crown ethers [17], and l-lysine [18] were used to functionalize the crosslinked chitosan for adsorption of metal ions. Although there are reports on the effectiveness of the magnetic chitosan on the removal of metal ions [11,12,19], the ethylenediamine-modified magnetic chitosan nano-adsorbent and the potential effectiveness of the adsorbent for the adsorption of Pt(IV) and Pd(II) have not been discussed.…”