论文部分内容阅读
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。
The surface of Fe_3O_4 was modified by tetraethyl orthosilicate (TEOS) and linked with 4-chlorophenyl isocyanate-modified chitosan via hexamethylene diisocyanate (HDI) to obtain functionalized Fe_3O_4 @ SiO_2 - chitosan magnetic microspheres (magnetic microspheres C) were synthesized and characterized by scanning electron microscopy and Fourier transform infrared spectroscopy (FTIR). The adsorption properties of the obtained magnetic microspheres C on Cu2 + were investigated. The results showed that the average particle size of magnetic microsphere C was about 520 nm, the dispersibility was good, and the equilibrium of Cu2 + adsorption was reached within 30 min. When the amount of adsorbent was 0.1 g, the concentration of Cu 2+ was 0.02 mol / L, pH = 5, the adsorption capacity can reach 55.46mg / g. The adsorption isotherm data accord with the Langmuir model and the Freundlich model.