A novel magnetic diatomite was synthesized using a two-step method combining precipitation and combustion methods. The prepared magnetic diatomite with functional particles and strong magnetism was verified by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and vibrating sample magnetometer. Results showed that the modified magnetic diatomite performed better than the raw diatomite in the efficient removal of nitrobenzene from aqueous solution. The adsorption kinetics and the isothermal and desorption–adsorption properties were also studied. Results revealed that the adsorption kinetics and isothermal data corresponded to the pseudo-first-order kinetic model and chemisorption process. Desorption–adsorption experiments were conducted, and the as-prepared magnetic diatomite remained to have high nitrobenzene adsorption efficiency even after six cycles of desorption and adsorption. Furthermore, the synthesized magnetic diatomite can be quickly and easily separated using a magnet before and after adsorption.

利用沉淀和燃烧相结合的两步法合成了一种新型的磁性硅藻土。通过X射线衍射，扫描电子显微镜，傅立叶变换红外光谱，X射线光电子能谱和振动样品磁强计验证了所制备的具有功能性颗粒和强磁性的磁性硅藻土。结果表明，改性的磁性硅藻土在从水溶液中有效去除硝基苯方面比原始的硅藻土表现更好。还研究了吸附动力学，等温和解吸-吸附特性。结果表明，吸附动力学和等温数据符合拟一级动力学模型和化学吸附过程。进行了解吸-吸附实验，制备的磁性硅藻土即使经过六次解吸吸附仍保持较高的硝基苯吸附效率。此外，可以在吸附之前和之后使用磁体快速且容易地分离合成的磁性硅藻土。