新型三维石墨相碳化氮复合材料用于环境污染物的分离富集研究

本研究拟合成一系列新型功能性三维立体结构的石墨相碳化氮复合纳米材料，并结合色谱-质谱联用技术用于复杂基质中环境污染物的快速富集、分离分析。二维石墨相碳化氮纳米片具有比表面积大、位点多的特点，与热学、力学优异的功能材料（诸如金属有机骨架材料、新型纳米材料）通过共价键或静电相互作用以层层自组装形式形成具有性质稳定、结构完整的三维层状复合物。该复合材料不仅兼具功能材料与石墨相碳化氮纳米片自身所具有的各种卓越性能，而且在材料的杂化过程中，产生了新的结构单元与特性，因而具有更高的富集能力、更良好的热学、力学、化学稳定性及高选择性等特性。将制备得到的复合纳米材料用于制备几种类型的新型固相萃取柱(SPE)、固相微萃取涂层(SPME)，从而建立SPME和GC-MS-MS联用高灵敏度检测技术平台，和高通量SPE和HPLC-QTOF-MS技术，以期实现对复杂基质中的痕量环境污染物的高灵敏、高效分离分析。

This study intends to develop a series of three dimensional (3D) functional graphitic carbon nitride（g-C3N4） nanosheet based nanocomposites, coupled with chromatography - mass spectrometry for rapidly enrichment and analysis of environmental pollutants in the complex matrix. The two dimensional g-C3N4 nanosheet possesses high specific surface areas and many sites, while functional materials such as metal–organic framework, nanomaterials exhibit superior thermal, mechanics, and chemical properties. Base on the two materials, a series of 3D g-C3N4 nanocomposites would be fabricated utilizing a versatile step-by-step assembly strategy by cocalent binding or an electrostatic interaction via a hydrothermal reaction. The 3D g-C3N4 nanocomposites would show better stability, more adsorption sites and higher load capacity due to they not only endow obvious advantages of g-C3N4 nanosheet and functional materials, but also new structural units and features would be created in the materials. Solid phase microextraction (SPME) coating fiber and solid phase extraction (SPE) column would be prepared based on the 3D g-C3N4 nanocomposites, then excellent SPE-HPLC-QTOF-MS and SPME-GC-MS/MS platforms would be established for the automation, high efficiency, high sensitivity for environmental pollutants analysis. The established system would applied to the sensitive and efficient separation and analysis of trace environmental pollutants for complex matrices.