杯[6]芳烃衍生物改性壳聚糖的合成及吸附性能研究

Synthesis of Calix[6]arene-Chitosan Polymer and It′s Adsorption Property

通过单取代溴丙氧基对叔丁基杯[6]芳烃衍生物与壳聚糖发生交联,合成一种新型的杯[6]芳烃-壳聚糖聚合物,对聚合物进行了红外、X射线衍射和扫描电镜表征。并考察了聚合物对过渡金属离子Zn2+,M n2+,Pb2+,C r3+,Cu2+的吸附性能。结果表明,该聚合物兼具杯芳烃与壳聚糖的各自优势,不仅吸附能力较强,而且对部分离子表现出较高的选择性吸附。

The p-tert-butyl-calix[6]arene was synthesized by p-tert-butyl phenol and formaldehyde in the alkaline condition. Mono-substituted calix[6]arene derivative was obtained by the reaction of calix [6] arene and 1,3-substituted bromine propane. The structure of calix [6] arene derivative was characterized by FT-IR spectra, ^1H-NMR . Calix[6]arene-chitosan polymer was synthesized by the Mono-substituted calix[6]arene derivative reacted with pretreatment chitosan. Its structure was characterized by FT-IR spectrum,X-ray diffraction spectroscopy and scanning electrom microscopy（SEM）. In the IR spectrum, we can see that it shows the absorb peaks of the calix[6]arene in the prepared product, which are phenyl, methylene and cymene respectively, it proves that calix[6]arene has reacted with chitosan. The X-ray diffraction of polymer indicates that the product is considerably more amorphous than chitosan after the reaction of calix[6]arene with hydroxyl or amidogen of chitosan. SEMs of the surface morphology of polymers indicates that cross-linked chitosan＇s surface shows more loosen cavities and reticulat structure. Also for this kind of structure it is easy to adsorb metal ions. The adsorption experimental of cross-linked polymer for Zn^2＋, Mn^2＋,Pb^2＋ ,Cr^3＋and Cu^2＋was studied. The result shows that calix[6]arenelinked chitosan polymer keeps better adsorption capacity and exhibits excellent adsorption selectivity capacity compared with uncross-linked chitosan, especially toward Cr^3＋and Cu^2＋due to the synergistic action of calix[6]arene and chitosan.