Study On The Application Of Post-modified UiO-66 In Adsorption And Detection Of Pollutants

In recent years,metal organic framework materials?MOFs?have been received extensive attention and studied due to its potential applications in fluorescence,gas separation and adsorption and catalysis.Generally,MOFs has high surface area and porosity.,and its pore size,shape and structure,geometry and surface functionality can be easily regulated by selecting suitable metal ions and different organic ligands,.Phthalates?DMPs?,known as "environmental hormones," have a subtle effect on people's health,while long-term exposure to hexavalent chromium raises the incidence of cancer?Therefore,in this study,MOFs was developed and studied as adsorbent for the removal of DMP and hexavalent chromium.The main results are as follows:?1?Two kinds of MOFs,UiO-66-1 and UiO-66,repectively,were synthesized for adsorbing DMP from water,it was found that UiO-66-1 has a good adsorption effect on DMP in water with a maximum adsorption capacity of 404 mg/g.As compared with other adsorbents for DMP adsorption,MOFs exhibits high adsorption kinetics,reaching equilibrium within 5 to 10 min,and the recycling rate is also high;The adsorption process can be well-described by using Langmuir model and quasi-second-order kinetic model.By comparing UiO-66 and UiO-66-1,it was found that the amount of UiO-66-1 adsorbed by the defect was doubled and the size of the crystal was also significantly increased.The specific surface area and pore volume of UiO-66-1?1438 m²/g and 0.58 cm³/g,respectively?,was larger than that of UiO-66?973 m²/g,0.47 cm³/g?,to provide more favorable conditions for the adsorption of DMP.?2?Using two kinds of metal organic framework materials to adsorb hexavalent chromium in water respectively,we found that Ui O-66-1 has a good adsorption effect on Cr?VI?in water with a maximum adsorption capacity of 28 mg/g,the adsorption and desorption rate of UiO-66-1 reached to 10%within 10 min.The adsorption of UiO-66-1 was in good agreement with the Langmuir model and the pseudo-second-order kinetic model through the adsorption isotherm model and adsorption kinetics model.By comparing UiO-66 and UiO-66-1,it was found that the amount of UiO-66-1 adsorbed by the defect was doubled and the size of the crystal was also significantly increased.The specific surface area of UiO-66-1 was larger than that of UiO-66,reaching 1438 m²/g,pore volume of 0.58 cm³/g,which provided more favorable conditions for the adsorption of Cr?VI?.Eu³⁺-doped UiO-66 and UiO-66-1 were successfully synthesized.The Eu³⁺-doped MOFs were fluorescently labeled with Cr?VI?in the aqueous phase.?3?A series of work has been done on the synthesis of the films.The UiO-66 film and the UiO-66-1 film have been synthesized by adjusting the ratio successfully.The XRD characterization experiment shows that the crystal structure is intact and the peak shape is good.The crystal can be seen by SEM wrapped in the fiber carrier film.