Preparation of carboxymethyl chitosan-graft-β-cyclodextrin modified silica gel and preconcentration of cadmium.
Carboxymethyl chitosan (CMCS) grafted with β-cyclodextrin (CMCS-g-CD) modified silica gel as a new solid phase extraction (SPE) adsorbent for cadmium has been developed. The optimum batch experimental conditions (pH, amount of adsorbent and contact time) and column experimental conditions (concentration and volume of elution solution) were optimized, respectively. The kinetic models for Cd (II) were investigated and the results indicated that pseudo-second-order equation provided a better R(2) (R(2)>0.999) and agreement between calculated Qe value (10.6 mg/g) and the experimental Qe (exp) value (11.3 mg/g). The developed method was successfully applied to the determination of Cd(II) in lake water and tap water with recoveries ranging from 96.0% to 102.0%.
College of Materials Science and Engineering, Fuzhou University, 350108, China. Electronic address: hx_lv@163.com.
Haixia
H
Lü
Hongtao
H
An
Xiaoming
X
Wang
Zenghong
Z
Xie
D000042:Absorption; D002104:Cadmium / Q000737:chemistry*; D048271:Chitosan / Q000031:analogs & derivatives* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D007700:Kinetics; D058428:Silica Gel / Q000737:chemistry*; D013997:Time Factors; D047392:beta-Cyclodextrins / Q000737:chemistry*
D007477:Ions; D047392:beta-Cyclodextrins; C514968:carboxymethyl-chitosan; D002104:Cadmium; D058428:Silica Gel; D048271:Chitosan
Cadmium; Carboxymethyl chitosan; β-Cyclodextrin