The Preparation Of Functional Mental Organic Frameworks For The Application Of Removal Dyes From Aqueous Solution

Adsorption method has attracted extensive attention in the removal of dyes from aqueous solution because of the advantages of low cost,simple operation,high efficiency and environmental-friendly.Nowadays,clay minerals,magnetic materials,polymers,and metal-organic frameworks?MOFs?have been successfully applied in the removal of organic dyes from aqueous solution.Among them,MOFs have been widely employed in the removal of organic dyes in aqueous solution due to its high surface areas,tunability of pore size,and high stability.To study the application of functional MOFs in the removal of pollutant in aqueous solution,the following major innovative researches which were developed at postgraduate stage were carried out in this dissertation study on the basis of the previous works.?1?The NH₂-MIL-53?Al?@PDA nanomaterials were synthesized by in-situ polymerized method and characterized by X-ray diffraction?XRD?,Fourier transform infrared?FT-IR?,Brunauer-Emmett-Teller?BET?,Scanning electron microscopy?SEM?,and Transmission electron microscopy?TEM?.The cationic dyes crystal violet?CV?and malachite green?MG?were successful adsorption by functionalized NH₂-MIL-53?Al?@PDA.The maximum removal efficiency of NH₂-MIL-53?Al?@PDA nanocomposite at 308.15 K for CV and MG reached 90.50%and 92.37%,respectively,when pH was 10.0 and 8.0 for CV and MG,respectively.The adsorption might be attributed to hydrogen bonding,electrostatic,and?-?interactions.?2?The Fe₃O₄@SiO₂-IDA@NH₂-MIL-101?Al?@PPy nanocomposite with magnetic field response was successfully prepared,and characterized by TEM,SEM,BET,XRD,FT-IR,and the vibrating sample magnetometer?VSM?.Then,the influence of pH,concentration of solution,adsorption time,temperature,and the ionic strength on the adsorption properties and adsorption mechanism of Fe₃O₄@SiO₂-IDA@NH₂-MIL-101?Al?@PPy nanomaterials to the anionic dye congo red?CR?were studied.The results illustrated that the adsorption capacity of Fe₃O₄@SiO₂-IDA@NH₂-MIL-101?Al?@PPy on CR was 289.18 mg?g^-1 at 308.15 K and pH 7.0.The adsorption might be attributed to hydrogen bonding,electrostatic,and?-?interactions.?3?GO@Fe₃O₄/CS@HKUST-1 nanocomposite was prepared in this work.The nanocomposites were characterized by TEM,SEM,BET,XRD,FT-IR,and VSM.The adsorption properties and adsorption mechanism of GO@Fe₃O₄/CS@HKUST-1 to cationic dye methylene blue?MB?were studied under different experimental conditions.The results indicated that the adsorption capacity of GO@Fe₃O₄/CS@HKUST-1reached 82.04 mg?g^-1 at 308.15 K and pH 9.0.The adsorption might be attributed to electrostatic,hydrogen bonding and?-?interactions.