Adsorption properties of crosslinked carboxymethyl-chitosan resin with Pb(II) as template ions.
In the current study, we attempt to find a new adsorbent material based on chitosan to improve adsorption selectivity for heavy metals, so that the crosslinked N,O-carboxymethyl-chitosan resin with Pb(II) as template ions (crosslinked CMC template) were synthesized by using CMC adsorbed Pb(II) ions crosslinked with glutaraldehyde. The effects on adsorption capacities such as amount of crosslinking agent, degree of substitution of CMC, pH value of the initial solution and adsorption time were investigated. The adsorption experiments demonstrated the crosslinked CMC template has high adsorption selectivity for Pb(II) ions in solution containing single metal ions or coexistence of three metals ions of Cu(II), Zn(II) and Pb(II). Furthermore, it was investigated that the crosslinked CMC template has a good reusability and stability as compared to CMC. Finally, we studied the adsorption mechanism by FTIR spectra and XPS analysis. The results reveal that the adsorption of crosslinked CMC template and CMC for Pb(II) is a chelation process.
Sun
Shengling
S
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, PR China.
Wang
Li
L
Wang
Aiqin
A
D000085:Acetates / Q000737:chemistry; D000327:Adsorption; D002240:Carbohydrate Sequence; D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D008969:Molecular Sequence Data; D012117:Resins, Synthetic; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared
D000085:Acetates; D003432:Cross-Linking Reagents; D008670:Metals; D012117:Resins, Synthetic; C077199:O,N-carboxymethylchitosan; D007854:Lead; D048271:Chitosan