超顺磁性石墨烯在水体中的双吸附机制及形态分布特性研究

Graphene, as a new exotic material, has received world-wide attention due to its exceptional structure and properties and the high adsorption capacity for water pollutants. However, the potentially negative impact on environment caused by its slather using is highly vigilant. Hence, there is an urgent need for intensive focus and research along with its environmental behavior. The superparamagnetic graphene nanoparticles, which can be separated from the matrix by using a magnet are chosen for this study with numbers of instrumental analysis and experimental techniques are applied. The corresponding experimental research based on the aqueous phase and sediment system, the dual-adsorption mechanisms of the organic and heavy metal pollutants on superparamagnetic graphene nanoparticles are investigated, along with the adsorption kinetics and thermodynamics of single and two contaminants on the materials are simulated. Meanwhile, the morphological characteristics of the superparamagnetic graphene nanoparticles in water are also observed and the model of their aggregation kinetics is constructed. Furthermore, the distribution status of superparamagnetic graphene particles in water and sediment is analyzed, and the adsorption mechanism of the superparamagnetic graphene with sediment is revealed as well. Finally, all these are expected to provide theoretical basis for the research of the dual-adsorption mechanism of graphene materials and technical guidance for the phase distribution and fate of the graphene particles in water environment.

石墨烯独特的结构和优异的性能使其作为新型材料对水体中污染物的吸附处理受到关注，同时对其大量使用引发的环境风险问题值得高度警惕。因此，开展石墨烯各种环境行为的基础研究十分必要且迫不及待。本课题选择易于磁性分离的超顺磁性石墨烯纳米颗粒材料为研究对象，综合运用多种仪器分析及实验技术，通过在水相体系和底泥体系中的相应实验研究，解析超顺磁性石墨烯材料对有机及重金属污染物的双吸附机理，模拟材料对单一污染物和两种污染物的吸附动力学和热力学；观测超顺磁性石墨烯颗粒在水体中的形态特征，构建颗粒的聚集动力学模型；剖析超顺磁性石墨烯颗粒在水-底泥中分布状况，揭示颗粒与底泥的吸附作用机理。以期为石墨烯材料双吸附机制的研究提供理论基础，并为石墨烯颗粒在水环境中的形态分布及归趋提供技术指导。

本课题选择易于磁性分离的超顺磁性石墨烯纳米颗粒材料为研究对象，综合运用了多种仪器分析及实验技术，通过在水相体系和底泥体系中的相应实验研究，解析了超顺磁性石墨烯材料对有机及重金属污染物的双吸附机理，模拟了材料对单一污染物和两种污染物的吸附动力学和热力学；观测了超顺磁性石墨烯颗粒在水体中的形态特征，构建了颗粒的聚集动力学模型；剖析了超顺磁性石墨烯颗粒在水-底泥中分布状况，揭示了颗粒与底泥的吸附作用机理。该研究可以为石墨烯材料双吸附机制的研究提供理论基础，并为石墨烯颗粒在水环境中的形态分布及归趋提供技术指导。