壳聚糖-Zr(Ⅳ)配合物的制备及催化氧化降解的研究

Preparation of Complexes of Chitosan with Zr(Ⅳ) and Catalysis Oxidizing Degradation

对壳聚糖进行液态均相配合反应制得壳聚糖-Zr(Ⅳ)配合物,通过AMF,IR,XRD及XPS等检测证实了壳聚糖与锆离子之间配位键的存在,且显示壳聚糖在形成配位结构后存在有利于降解的优势构象。以H2O2对壳聚糖-Zr(Ⅳ)配合物及壳聚糖进行氧化降解,探讨相同条件下粘度的变化及降解产物的分子量分布。结果表明,壳聚糖-Zr(Ⅳ)配合物的降解速度明显高于壳聚糖,降解产物分子量分布较壳聚糖直接降解窄,进一步证明壳聚糖-Zr(Ⅳ)配合物中存在有利于降解的优势结构。

Coordination compound of chitosan （CTS） with zirconium was prepared by the liquid homogeneity reaction. It was characterized by atom force microscope （AFM）, infrared spectrum （IR）, X-ray diffraction spectrum （XRD） and X-ray photoelectron spectrum （XPS）, which confirm the formation of coordination bonds between chitosan and zirconium ions. Hydrogen peroxide was used to degrade CTS-Zr （Ⅳ） and CTS to examine the viscosity variety and molecular weight distribution of degraded products under the same condition. The results showed that the degradation speed of CTS-Zr（ Ⅳ ） was much faster than that of CTS, and the molecular weight distribution of degrad- ed products was much more narrow, which suggest that the structure of the complexes was favorable to degradation.