功能化壳聚糖磁性微球的制备及其对Cu^(2+)的吸附行为

Preparation of functional chitosan magnetic microspheres and its adsorption behavior towards Cu^(2+)

用正硅酸四乙酯(TEOS)修饰Fe_3O_4表面,并将其与经4-氯苯基异氰酸酯改性的壳聚糖通过六亚甲基双异氰酸酯(HDI)连接,制得功能化Fe_3O_4@SiO_2-壳聚糖磁性微球(磁性微球C),采用扫描电镜、傅里叶红外光谱仪等手段对其进行表征,考察了所得磁性微球C对Cu2^(+)的吸附性能。结果表明:所得磁性微球C平均粒径520nm左右、分散性好,对Cu2+吸附在30min内达到平衡,在吸附剂用量为0.1g,Cu^(2+)浓度为0.02mol/L,pH=5时,吸附量可达到55.46mg/g,吸附等温数据既符合Langmuir模型,也符合Freundlich模型。

Fe3O4 was modified with tetraethyl orthosilicate,then chitosan was modified with the 4-chlorophenyl iso- cyanate, which were connected by a double hexamethylene isocyanate, the magnetic microspheres C was prepared. The mag- netic microspheres were characterized by scanning electron microscopy （SEM） and fourier transform infrared spectroscopy （FT IR） etc. Moreover,adsorption performance of the resulting magnetic microspheres C for Cu2. was investigated. Results showed that the average particle size of magnetic microspheres C was about 520nm, dispersed well, adsorption of Cu2＋ with- in 30min to reach equilibrium. When the adsorbent dosage of 0. lg, the concentration of Cu2＋ 0.02mol/L, pH = 5, the ad- sorption capacity can reach 55.46mg/g. The adsorption isothermal data accorded with Langmuir and Freundlich models.