植物油的复杂基质特性，使得前处理成为了制约植物油中重金属现场快速检测与控制的瓶颈。诸多固相萃取材料已被报道可以实现水体中重金属快速分离富集，但是对于植物油中重金属，相关吸附分离机制尚不明确，应用缺乏理论依据。针对这一问题，本项目拟通过设计固相材料开展植物油中重金属的吸附分离机理研究。首先，通过硬模板法制备对重金属具有高吸附性能的氮/硫双掺杂介孔碳磁性复合物Fe3O4@N-S-mC；然后，通过静态吸附试验，研究不同类型基质中重金属在材料上吸附与解吸行为的规律，获得吸附过程中吸附热力学和动力学参数，明确植物油中重金属的吸附特性；最后，利用谱学分析技术跟踪表征吸附过程Fe3O4@N-S-mC原子及官能团的谱学特征变化，揭示其吸附分离植物油中重金属机理。通过本项目的研究，将深入了解固相材料与重金属在植物油中的相互作用机制。为拓展植物油中重金属快速检测方法以及重金属消除方法提供理论基础和技术支撑。

Because of the complex matrix of vegetable oils, the sample pretreatment has become a bottleneck of restricting the fast detection and control of metallic contaminants in vegetable oils. Rapid separation and enrichment of heavy metals from aqueous solution through solid phase extraction (SPE) adsorbents have been widely reported. However, as little was known about the adsorption behavior of heavy metals in vegetable oils, the application of SPE in vegetable oils is restricted in theoretical and practical aspects. In order to reveal this issue, a particular solid adsorbent was designed to study the mechanism of adsorption and separation of heavy metals in vegetable oils in this project. Firstly, a novel magnetic N/S co-doped mesoporous carbon composite (Fe3O4@N-S-mC) with high adsorption capacity will be prepared by hard template method. Secondly, static adsorption experiments will be carried out to investigate the effects of types of matrix on the adsorption and desorption of heavy metals onto Fe3O4@N-S-mC. The adsorption thermodynamic and kinetics parameters of heavy metals in adsorption process will be calculated, and the adsorption characteristics of heavy metals by Fe3O4@N-S-mC in vegetable oils will be evaluated. Finally, the adsorption and separation mechanism of Fe3O4@N-S-mC for the heavy metals in vegetable oils will be studied based on the above results and spectrum analysis of characteristic signals of atoms and functional groups. The research results of this project will take an in-depth look at the interaction mechanism between the solid adsorbent and heavy metals in vegetable oils, and provide basic theory and technical support to develop new methods for the fast detection and elimination of heavy metals in vegetable oils.