Adsorption of Some Platinum Group Metals on Some Complexane Types of Chemically Modified Chitosan

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

“…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.…”

“…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.…”

Desorption of Cadmium from Porous Chitosan Beads

“…The value of K Cd was determined by setting C e , Q M and q Cd equal to 2.09 mmole/L, 6.2 mmole/g, and 0.27 mmole/g respectively in equation (12). The K cd value estimated at pH 7.0 was 2.12 (mole/L) -1/2 which is higher than the K cd value of 0.57 (mole/L) -1/2 estimated by equation (15). However, the values of K Cd estimated by both methods are in general much smaller than the value of K a ′ .…”

“…Three major assumptions are made for the equilibrium model. First, the adsorption of cadmium ions on the crosslinked chitosan beads may follow the chelation binding mechanism validated by Inoue et al [15], which shows that divalent cadmium ions adsorb onto amine groups of chitosan to form metal-chelate complexes with composition of 1 mole of cadmium to 2 mole of glucosamine unit. Second, the Cd +2 ions chelate only with imino (-CH=N-) groups in the outer shell of the crosslinked chitosan.…”

Adsorption Properties of Ionic Species on Cross-linked Chitosans Modified with Catechol and Salicylic Acid Moieties

“…[2][3][4] In order to develop high-performance chitosan resins for the pretreatment of water samples, many researchers have discussed the adsorption properties of cationic species, such as heavy metals and lanthanoids on chitosan resins modified with chelating moieties, such as iminodiacetic acid (IDA) group, ethylenediaminetetraacetic acid (EDTA) group, diethylenetriaminepentaacetic acid (DTPA) group, methylthiocarbamoyl group, phenylthiocarbamoyl group, 2-pyridylmethyl group, 2-thienylmethyl group, and 3-(methylthio)propyl group. [5][6][7][8][9][10] In order to elucidate the adsorption properties, we must systematically examine the adsorption behavior of several similar elements at various pH conditions. In our previous work, we developed some chitosan resins possessing amino acid as a chelating moiety for the preconcentration of trace elements in aquatic samples prior to the ICP-MS measurement.…”