Metal-Organic Frameworks And Their Derivatives Are Used For Adsorption Of Halogen Ions And Thiophene

Whether it is the harmful ions in the sewage or the exhaust gas produced by the fuel,both of them seriously damage to the development of environment and human health,so it is extremely significant for us to find a meaningful strategy to removal of them.In this thesis,harmful ions and thiophene in the simulated oils have been removed by using the method of adsorption.Benefit from the rich and diverse functional groups,metal-organic frameworks（MOFs）can be adjusted and designed artificially according to the specific requirements,showing great advantages in the field of adsorption and separation.The preparation of silver nanoparticle-containing derived carbon materials and composites by aluminum-based and zirconium-based MOFs through a one-step reduction method was proposed in this work.The reduction and loading of Ag0 can be realized in one step.The method is simple and efficient,thereby realizing the extraordinarily effective adsorption and removal of halide ions and thiophene.The research contents are as follows:1.CAU-1-（OH）₂was synthesized and MOF-derived Ag⁰/carbon nanoparticle（Ag⁰/C-NP）was prepared by using the metal-organic framework as a reduction precursor.Compared with other preparation methods of silver nanoparticles doped materials,the method combined the loading of silver in the materials with the steps of reduction by adding reducing agent or at high temperature.Silver ions can be reduced and successfully loaded in the materials based on the specific redox reaction between silver nitrate and hydroxyl groups.The synthesized Ag⁰/C-NP is composed of the carbon-based matrix and Ag nanoparticles with a uniform size of 5-10 nm.The synthetic material exhibits an excellent adsorption capacity of 177.4 mg g^-1.Besides,adsorption can be reached equilibrium at 1 h,Ag⁰/C-NP have a good anti-interference ability.2.UiO-66-（OH）₂,which has a high density hydroxy-OH functional groups and highly stability,was synthesized and Ag⁰-Ui O-66-（OH）₂was prepared by using this material.The integral framework of the resulting material（Ag⁰-Ui O-66-（OH）₂）was found to be complete after this reaction.The size of silver nanoparticles which reduced is about 5-10 nm.Silver,which ascribes to soft acid can interact with soft bases,iodide.The obtained material exhibits a high adsorption capacity of iodide(531.98 mg g^-1).Adsorption can reach equilibrium at 1 h and Ag⁰-Ui O-66-（OH）₂have a good anti-interference ability in the condition of co-exist ions.Besides,the irreversible adsorption of iodide in Ag⁰-Ui O-66-（OH）₂is meaningful,which promoting the deep burial treatment of this radioactive substance,and avoids secondary pollution caused.3.The novel adsorbent Ag⁰-UiO-66-（OH）₂prepared from UiO-66-（OH）₂and silver nitrate by one-step redox method has abundant Ag active sites.The obtained Ag has a good distribution in the materials due to the well-dispersed hydroxyl groups.The empty orbital of Ag has a strong interaction with theπelectron of thiophene or the lone pair of sulfur atom,which can increase the adsorption capacity of thiophene.The adsorption amount of thiophene for116.04 mg g^-1,adsorption can reach equilibrium at 150 min.