Study On Preparation Of Functional UiO-66 Type MOFs And Adsorption Performance To Explosives

Along with the development of the military enterprise,the explosives in dynamite factory sffluent are difficult to be effectively removed,gradually becoming a difficulty in dealing with industrial wastewater,which arouses wide attention around the world.Metal-organic frameworks?MOFs?have emerged as important family of porous materials in the past decade,which is promising to be good adsorbent materials.In this paper,in order to achieve the effective removal of explosives in waste water,using the combination of theoretical analysis and experimental research,two functional UiO-66 type MOFs materials were treated as new type adsorbents,then their adsorption performance toaromatic explosives solution were systematically studied.Firstly,two zirconium?IV?-based MOFs UiO-66-NH₂ and UiO-67-?NH₂?₂ had beensuccessfully prepared by facile solvothermal method,and were characterized by X-ray diffraction?XRD?,field emission transmission electron microscopy?FETEM?,N₂adsorption-desorption?BET?.They exhibited small size and large surface area.Secongly,the adsorption effect of aromatic explosives solution onto two MOFs materials was studied respectively under the same conditions.The results showed that effective and selective adsorption of aromatic explosives containing phenolic hydroxyl group onto both of two MOFs materials.The selective adsorption was due to hydrogen-bond interaction between a lot of basic group-NH₂ on surface of materials and the H⁺ionizated from aromatic explosives containing phenolic hydroxyl group.The stability of structure of two MOFs materials was exhibited through the characterization of X-ray diffraction before and after adsorption respectively.Finally,by comparing the material properties and differences of explosives adsorption performance of UiO-66-NH₂ and UiO-67-?NH₂?₂,it could be concluded that the increase of pore size and the specific surface area was conducive to the increase of the adsorption quantity.By studying the adsorption properties of MOFs on explosives,it is shown that both MOFs can be applied to the removal of explosives in explosive wastewater,which provides a direction for industrial wastewater treatment.