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Synthesis of Carboxylcontaining Grafted Chitosan Polymer and ItsAdsorption Properties for Heavy Metal Ions

Peng Changhong\ Wang Yuting\ Cheng Ge(Dept.of Environ.Sci.,Wuhan Univ.,430072) Tang Yurong(Center of Analysis Measurement,Wuhan Univ.,430072)  
Water insoluble crosslinkedchitosan was prepared by crosslinking soluble chitosan with epichlorodydrin and carboxylcontaining grafted chitosan polymer was obtained by grafting acrylonitrile onto the crosslinkedchitosan with ferrous sulfatehydrogen peroxide as the initiator and finally by subjecting it to basing saponification,whose structure was confirmed by elemental analysis,FTIR spectra analysis and Xray diffraction analysis.The adsorption properties for Cu2+、Cr3+、Cd2+ and Pb2+ were studied also.It could be seen that the content of nitrogen in CTCA is lower than that in CTS and CCTS,and the characteristic peak of —COONa appeares at 1570cm-1 and 1470cm-1 in CTCA.It was also found that CCTS and CTCA have the characteristic peak of pyranylibration at 900cm-1 which demonstrats that the ring of pyanyl is not destroyed in the reaction of crosslinking and grafting.The adsorption experimental results showed that CTCA has good adsorption capacities for Pb2+ and Cd2+;the adsorption speed of CTCA for Cd2+ is higher than that of Cu2+ and the adsorption capacities are also affected by the acidity of medium.The chelate mechanism was investigated by FTIR spectra analysis and the XPS data of CTCA and CTCACu2+.
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