In the solidification process using asphalt as a medium, nitrate oxidizes the medium and makes it unstable. Therefore, in order to efficiently remove nitrate from wastewater, a magnetic adsorbent was synthesized (m-MWCNTs), and physicochemical properties of m-MWCNTs were confirmed by SEM, TEM, XRD, FT-IR, BET, and VSM analyses. In the process of synthesizing m-MWCNTs, the amount of magnetite introduced on the surface of MWCNTs could be controlled by increasing the concentration of the chemical agent that becomes the Fe precursor. In addition, the amount of nitrate adsorption increased with higher magnetite content on the surface of MWCNTs. The adsorption process followed the Langmuir model and pseudo-second-order kinetics. In nitrate adsorption using m-MWCNTs, pH was the main condition to determine the adsorption amount, and as the pH increased, the amount of nitrate adsorption decreased. Thermodynamic experiments revealed that the adsorption of nitrate by m-MWCNTs is an endothermic and spontaneous process.

在使用沥青作为介质的固化过程中，硝酸盐会氧化介质并使其不稳定。因此，为了有效去除废水中的硝酸盐，合成了一种磁性吸附剂（m-MWCNTs），并通过SEM、TEM、XRD、FT-IR、BET和VSM分析证实了m-MWCNTs的理化性质。在合成 m-MWCNTs 的过程中，引入到 MWCNTs 表面的磁铁矿的量可以通过增加成为 Fe 前驱体的化学试剂的浓度来控制。此外，随着多壁碳纳米管表面磁铁矿含量的增加，硝酸盐吸附量增加。吸附过程遵循朗缪尔模型和准二级动力学。在使用 m-MWCNTs 吸附硝酸盐时，pH 是决定吸附量的主要条件，随着 pH 的增加，硝酸盐吸附量减少。热力学实验表明，m-MWCNTs 对硝酸盐的吸附是一个吸热和自发过程。