接枝含氮杂环化合物壳聚糖的合成及其对重金属离子的吸附研究

Synthesis of nitrogen-heterocycles grafted chitosan polymer and its adsorption properties for heavy metal ions

以Fe2+-H2O2为引发剂,N-乙烯基吡咯烷酮为醚化剂,将壳聚糖进行醚化改性,得到接枝含氮杂环化合物壳聚糖(NVP-CTS),并通过红外光谱和元素分析证实了接枝化合物的存在。同时通过试验研究了NVP-CTS对Ni2+,Cu2+,Cr3+,Pb2+四种重金属离子的吸附性能。实验发现,由于在壳聚糖分子中接枝上了含氮杂环化合物,NVP-CTS对重金属离子的吸附性能为改性前的2～5倍,并且对Ni2+有特殊的吸附能力,吸附量约为其它离子的2倍。同时对吸附时间、吸附温度以及吸附溶液pH值对吸附能力的影响进行了实验研究。

Nitrogen-Heterocycles Grafted Chitosan Polymer (NVP-CTS)was Synthesized by treating chitosan whit H_2O_2-Fe^(2+) as initiator and N-vinylpyrrolidone (NVP) as Etherify agent. The resultant NVP-CTS had been identified by means of IR and elemental analysis. Its adsorptive ability for heavy metal ions, Ni^(2+),Cu^(2+),Cr^(3+),Pb^(2+), was studied and investigated the effect of adsorption temperature, time and pH value of adsorption solution. The results showed that the adsorption ability of modified chitosan are 2~5 times higher than of unmodified respectively by this processs. It was also found that NVP-CTS has a strong adsorption ability for Ni^(2+).