功能化纤维素磁性微球的制备及其对Cu^(2+)的吸附行为

Preparation of functional cellulose magnetic microspheres and its adsorption behaviors 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纤维素通过六亚甲基双异氰酸酯(HDI)连接,制得功能化Fe_3O4_@SiO_2-纤维素磁性微球(磁性微球C),并采用扫描电镜(SEM)、傅里叶红外光谱仪(FTIR)等对其进行表征,考察了所得磁性微球C对铜离子(Cu^(2+))的吸附性能。结果表明:所得磁性微球C平均粒径为573 nm左右,分散性好,对Cu^(2+)吸附在30 min内达到平衡,在吸附剂质量为0.1 g,Cu^(2+)浓度为0.02 mol/L,p H=4时,吸附量可达到44.23 mg/g,吸附等温数据符合Langmuir模型。

The functional Fe3O4@ SiO2-cellulose magnetic microspheres（ magnetic microspheres C） is prepared through connecting TEOS decorated Fe3O4 with 4-chlorophenyl isocyanate modified cellulose by using hexamethylene diisocyanate as a bridging agent. The magnetic microsphere C is characterized by scanning electron microscopy（ SEM）and Fourier transform infrared spectroscopy（ FTIR）,etc. Its adsorption performance towards Cu^2＋is investigated. The results show that the resulting magnetic microspheres C has an average particle size of about 573 nm and is welldispersed. The adsorption of Cu^2＋ reaches equilibrium within 30 minute. The adsorption capacity is 44. 23 mg / g with 0. 1g of adsorbent dosage and 0. 02 mol / L of Cu^2＋ at p H = 5. The adsorption isothermal data accord with Langmuir model.