双金属-草酸配合物衍生铁酸镍及其吸附性能评价

Bimetal-oxalate Complex Derived Nickel Ferrite and Its Adsorption Property

本文采用热分解双金属-草酸配合物衍生制备铁酸镍多孔磁性纳米结构。通过改变加料顺序和溶剂组成实现对配合物生长的调节,并进一步获得具有不同尺寸、形貌和结构的多孔铁酸镍颗粒。表征结果显示利用该法制备的铁酸镍具有大的比表面积和较高的饱和磁化强度。染料吸附测试显示铁酸镍对刚果红具有良好的吸附性能,最佳样品的吸附容量可达212.1 mg·g^(-1),动力学拟合则表明可能主要以化学吸附为主。

Herein, porous nickel ferrite magnetic nanostructures were prepared by thermal decomposition of bimetal oxalate complexes. The growth of the oxalate complex was regulated by changing the feeding sequence and the solvent composition, leading to porous nickel ferrite particles with different sizes, shapes and structures. The adsorption process of Congo red on NiFe2O4 was monitored by UV-Vis absorption spectroscopy. The characterization results showed that nickel ferrite prepared by this method had a large specific surface area and relatively high saturation magnetization. Dye adsorption tests showed that nickel ferrite had good adsorption properties for Congo red and the adsorption capacity of the best-performing sample could reach 212.1 mg·g^(-1). Kinetic fitting indicated that chemical adsorption may be the main adsorption mechanism.