Fe3O4复合粉体的制备及其对重金属离子的吸附性能

本文研究了Fe3O4复合粉体的制备及其对重金属离子的吸附性能。采用溶剂热法合成出磁性Fe3O4纳米粉体，通过改进的St?ber法和沉淀聚合法对Fe3O4颗粒进行包覆SiO2和PMMA修饰，在氨基改性后进行了重金属离子的吸附测试。采用扫描电子显微镜（SEM）、X-射线衍射仪（XRD)和傅里叶变换—红外光谱（FTIR）对所制备的颗粒进行了组成、结构和形貌表征；通过紫外-可见分光光度仪（UV-vis）测定离子浓度来评价复合颗粒对金属离子的吸附性能。结果表明，制备的黑色Fe3O4粉体为尖晶石结构，室温下具有超顺磁性，有很好的磁分离性能；包覆后，得到了均匀、完整的复合微球，粒径大约800 nm；室温下，当pH=6时，微球在2.5小时时对Cu2+的最大吸附容量约为170 mg/g；当pH=7时，微球在2.5小时时对Ni2 的最大吸附量达到72 mg/g。

Preparation and Heavy Metal Ion Adsorption Properties of Fe3O4 Composite Particles

Magnetic Fe3O4 nanoparticles were prepared by solvent hot method, and then they were coated with SiO2 and PMMA shells by St?ber method and precipitation polymerization. After modifying using amino, the heavy metal ions adsorption tests were carried out. Component, morphology and microstructure of the composite particles were investigated by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and Fourier infrared spectrometer (FTIR). Ultraviolet-visible spectrophotometer (UV-vis) was used to determine the ion concentration. Results show that the obtained black Fe3O4 powder has a spinel structure and exhibits superparamagnetism at room temperature, giving rise to excellent magnetic separation performance. After coating, the size of homogeneous composite microspheres is about 800 nm. When the pH value is 6, the absorption capacity of?Cu2+?on microspheres?after 2.5 h was about 170 mg/g. When the pH value is 7, the absorption capacity of?Ni2 on microspheres?after 2.5 h was about 72 mg/g.