羧甲基纤维素-Fe3O4复合纳米磁性材料的制备及其渗透性能

Preparation and penetrative properties of magnetic carboxymethl cellulose-Fe_3O_4 nano-composite particles

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。

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 CMC-Fe3O4 which dispersed homogeneously in water is inverse spinel structure and the average particle size is 40nm.Carboxymethyl cellulose molecules are chemically adsorbed on the surface of Fe3O4 nano-particles.The zeta potential of CMC-Fe3O4 is lower than common Fe3O4 under the same pH and its saturation magnetization is 36.74emu·g-1.Filtration coefficient of CMC-Fe3O4 in the soil is approximately 0.03 cm-1,and 72% of CMC-Fe3O4 suspension could penetrate through the soil column（10cm） under gravity in the soil column tests.