Application Of Several Porous Materials Composites In Separation And Analysis Of Environment Containment

In terms of their versatile structures and adjustable surface chemistry,porous materials exhibit extraordinary properties when compared with traditional nanoparticles in applications.Metal-organic frameworks（MOFs）,as one kind of coordination polymers which are consisted of metal ions coordinated to organic molecules.MOFs have large specific surface areas,numbers of unsaturated metal sites.As an emerging 2D layered nanomaterials,graphitic-phase carbon nitride（g-C₃N₄）is a novel porous material,abundant polyaromatic scaffold based big pore endows a strong specific affinity for carbon-based ring structures.In this thesis,MOFs are applied to the coatings of solid phase microextraction（SPME）.Furthermore,MOFs and protonated mesoporous graphitic carbon nitride were also applied for rapid and high efficient removal of environment containment.The main content of this paper consisted of the following four parts.1.In chapter 1,we review the nanoporous materials and their application,then the characteristics,preparation and application of MOFs were summarized,the characteristics and application of g-C₃N₄ were also mentioned.The theory of SPME,the classifications and the preparation methods of fiber coating were introduced.Then the classifications and harm of dye were presented,dye removal methods and related adsorbent materials were also introduced.Finally,the research content and research significance of the thesis were introduced.2.Based on a facile and simple equipment,a in situ solvothermal growth method for immobilization of UiO-66 coating was introduced.The prepared UiO-66 coating was coupling with GC-MS for analysis of polycyclic aromatic hydrocarbons（PAHs）.The UiO-66 coating has big surface area,high thermal and chemical stability;it showed excellent extraction performance of 10 PAHs in environment.The limits of detection were between 0.28-0.60 ng/L.This method was successfully used for simultaneous determination of 10 PAHs from Minjiang water and soil samples with satisfactory recoveries of 87.0-113.6%and 83.8-116.6%,respectively.3.A novel g-C₃N₄ NS-HKUST-1 composites were synthesized and applied to removal of methylene blue（MB）from aqueous solution.Compared to HKUST-1,the pore size and pore volume of composite have dramatically increased.The composites showed high adsorption capacity and simple regeneration method in removal of MB.Thus,g-C₃N₄ NS-HKUST-1 attracts good application in the field of environmental remediation,treatment of wastewater.4.In order to synthesis the novel magnetic Fe3O4/g-C₃N₄ NSs/HKUST-1 core-shell microspheres,a mild hydrothermal method was developed successfully.The magnetic composites were consisting of g-C₃N₄ NSs and MOFs-HKUST-1.Compared to pure MOF,the obtained composites not only exhibited high magnetization,but also big pore size and large pore volume.The composites showed high adsorption capacity of MB.It is a rapid and low-cost separation method that it can be applied in wastewater treatment.5.In this study,mesoporous graphitic carbon nitride porous nanomaterials was synthesized through hard template,then functionalization of mesoporous graphitic carbon nitride was conducted by direct protonation and the mixture can serve as promising bioadsorbent for the uptake of Microcystins（MCs）.The protonated mesoporous graphitic carbon nitride exhibits extremely rapid rate as well as high capacities of 2.361 and 2.869 mg/g for removing MC-LR and MC-RR,respectively.The high adsorption capacity,good solvent stability,and excellent reusability make protonated mesoporous graphitic carbon nitride promising as a novel adsorbent for the adsorption and removal of MCs from aqueous solution.