羧甲基纤维素-Fe_3O_4复合纳米磁性材料的制备及其渗透性能

采用改进的氧化沉淀法在羧甲基纤维素(CMC)溶液中制备了以磁性纳米Fe3O4为核心,外包CMC的复合磁性纳米粒子。用透射电镜、X射线衍射、红外光谱、Zeta电位和震动样品磁强计对复合粒子进行了表面形貌、结构和磁学的表征。实验结果表明,CMC-Fe3O4复合纳米粒子为反尖晶石型,平均粒径约为40 nm;CMC在Fe3O4粒子表面是化学吸附;在相同pH值下,CMC-Fe3O4的表面Zeta电位低于纯相Fe3O4;CMC-Fe3O4的饱和磁化强度为36.74 emu.g-1;CMC-Fe3O4复合粒子在土壤介质中的过滤系数约为0.03 cm-1;在10 cm土柱渗透实验中,72%的CMC-Fe3O4复合粒子悬浊液穿过了土壤介质。

Preparation and penetrative properties of magnetic carboxymethl cellulose-Fe3O4 nano-composite particles

The carboxymethyl cellulose（CMC）Fe3O4  nano composite particles were prepared in the CMC solution by a modified oxidation deposition method. The properties, structure, and size of the products were characterized by IR, ZP (zeta potential), VSM (vibrating sample magnetometer), XRD and TEM. The results show that CMCFe3O4 which dispersed homogeneously in water is inverse spinel structure and the average particle size is 40nm. Carboxymethyl cellulose molecules are chemically adsorbed on the surface of Fe3O4nano-particles.The zeta potential of CMCFe3O4 is lower than common Fe3O4 under the same pH and its saturation magnetization is 36.74emu·g-1. Filtration coefficient of CMCFe3O4 in the soil is approximately 0.03 cm-1, and 72% of CMCFe3O4 suspension could penetrate through the soil column (10cm) under gravity in the soil column tests.