Cu2+印迹交联壳聚糖微球的合成及吸附性能

Synthesis and Adsorption Properties of Cu2+ Imprinted Crosslinked Chitosan Microspheres

摘要:

利用分子印迹技术，以壳聚糖为功能单体，Cu2+为印迹离子，通过稀氨水固化，环氧氯丙烷交联，盐酸洗脱Cu2+，制得Cu2+印迹交联壳聚糖微球。采用傅立叶变换红外光谱、X射线衍射仪和场发射扫描电子显微镜对产品进行表征。测定微球的骨架密度、含水量、交联度等物理性能，结果表明，交联改性可使微球具有多孔结构和良好的结构稳定性，能够很好地解决壳聚糖的酸溶性，提高微球对Cu2+的吸附性能。通过正交试验L9(34)，得到微球的最优制备条件为：壳聚糖1.5 g，环氧氯丙烷2.5 mL，80 ℃下交联3 h，制得的微球对Cu2+吸附性能最佳。同时在单组分体系中研究了微球对Cu2+的吸附性能。结果表明，当微球投加量为50 mg，Cu2+初始浓度为338.65 mg/L，pH为5，吸附量为72.8 mg/g。

Abstract:

By using molecular imprinting techniques, the Cu2+ imprinted crosslinked chitosan microspheres were prepared by using chitosan as functional monomer, Cu2+ as template ions, solidified by dilute ammonia, epoxy chloropropane crosslinked, and eluted Cu2+ by hydrochloric acid. The products were characterized by fourier transform infrared spectroscopy、X-ray diffractometer and field emission scanning electron microscopy. The physical properties such as skeleton density, water content, crosslinking degree etc of Cu2+ imprinted crosslinked chitosan microspheres were measured. The results showed that crosslinking modification can make the microspheres have porous structure and good structural stability, it also solve the acid solubility of chitosan very well, and the adsorption properties of microspheres on Cu2+ were improved. Through the orthogonal test and used table L9(34), the optimum preparation conditions of Cu2+ imprinted crosslinked chitosan microspheres were as follows: the quality of chitosan was 1.5 g, the dosage of epoxy chloropropane was 2.5 mL, crosslinked temperature was 80℃, crosslinked time was 3 h, the best adsorption property of microspheres on Cu2+ was obtained. The adsorption properties of microspheres to Cu2+ were also studied in single component system. The results showed that when the mount of microspheres was 50 mg, the initial concentration of Cu2+ was 338.65 mg/L, the pH value was 5, the adsorption capacity of Cu2+ was 72.8 mg/g.