Preparation and metal-binding behaviour of chitosan functionalized by ester- and amino-terminated hyperbranched polyamidoamine polymers.
A series of insoluble chitosan (CTS) derivatives were prepared by grafting ester- and amino-terminated dendrimer-like polyamidoamine (PAMAM) into CTS using a divergent method by repeating two processes: (1) Michael addition of methyl acrylate (MA) to surface amino groups, and (2) amidation of the resulting esters with ethylenediamine (EDA). Their structures were characterized by infrared spectra (IR) and wide-angle X-ray diffraction (WAXD). The adsorption capabilities of the products for Au(3+), Pd(2+), Pt(4+), Ag(+), Cu(2+), Zn(2+), Hg(2+), Ni(2+), and Cd(2+) were studied. The results showed that the products exhibited better adsorption capabilities for Au(3+) and Hg(2+) than for other metal ions, and the adsorption capabilities of amino-terminated products were higher than those of ester-terminated ones. Also it was observed that a high percentage of grafting of PAMAM into CTS does not ensure a high adsorption capacity.
School of Chemistry and Materials Science, Ludong University, Yantai, Shangdong, PR China. rongjunqu@sohu.com
Rongjun
R
Qu
Changmei
C
Sun
Chunnuan
C
Ji
Chunhua
C
Wang
Hou
H
Chen
Yuzhong
Y
Niu
Chengju
C
Liang
Qiyi
Q
Song
D000327:Adsorption; D000588:Amines; D048271:Chitosan / Q000138:chemical synthesis / Q000737:chemistry*; D004952:Esters; D008670:Metals / Q000737:chemistry*; D011108:Polymers; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
D000588:Amines; D004952:Esters; D008670:Metals; D011108:Polymers; D048271:Chitosan