Preparation Of Magnetic Conductive Polymers Materials And Their Performance In Removing Cr(?)

The development of industrialization has caused a large amount of Cr???-containing wastewater to be discharged into natural water,which has posed a huge threat to the normal life of human beings.The adsorption method has become the key technology for removing Cr???wastewater due to its simple operation and environmental friendliness.Fe₃O₄has a magnetic function and can be used for rapid solid-liquid separation by an external magnetic field;conductive polymers are rich in amino functional groups,which can provide a large number of adsorption sites for pollutants.Therefore,in this paper,the magnetic Ui O-66@Ppy and PANI@magnetic Si O₂-NH₂were successfully synthesized and used for the adsorption of Cr???.The purpose of this work is to explore the adsorption performance and mechanism of Cr???by the magnetic conductive polymer.The The results are as follows:?1?The characterization results of the magnetic Ui O-66@Ppy show that:Ui O-66 and Ppy are combined with the magnetic center in the form of a package,showing a shell-dual core structure as a whole material.The introduction of Ui O-66 effectively inhibits the agglomeration of Ppy,which increases the surface area of the material from 9.75m²/g to52.49m²/g.The higher surface area and pore volume of the adsorbent reduces the mass transfer resistance and accelerates the rate of ion exchange,provides more available active sites for pollutants.?2?The characterization results of PANI@magnetic Si O₂-NH₂show that Si O₂and PANI are combined with the magnetic material in the form of wrapping and loading,respectively.The surface amination of Si O₂improves the compatibility between the aniline monomer and the magnetic material,which makes the final PANI@magnetic Si O₂-NH₂appeared as an interlaced fibrous structure,providing a large number of adsorption sites for pollutants.?3?The adsorption experiment results of Cr???show that both magnetic Ui O-66@Ppy and PANI@magnetic Si O₂-NH₂achieve the best adsorption effect at p H=2,and the maximum adsorption capacity is 259.1 mg/g and 382.7 mg/g respectively.;The adsorption process of Cr???on the two adsorbents conforms to the pseudo-second-order kinetic model,and conforms to the Langmuir isotherm model and the Freunlich isotherm model,respectively.?4?The adsorption mechanism of magnetic Ui O-66@Ppy and PANI@magnetic Si O₂-NH₂to Cr???mainly includes:electrostatic attraction,the adsorbent was protonated and can adsorb the negatively charged Cr???under acidic conditions;reduction,The reducing functional group-NH-on the surface of the adsorbent degrades Cr???into Cr?III?;Ion exchange,the Cr???in the solution exchanges with the doped anions on the surface of the adsorbent;Chelation,The generated Cr?III?is fixed on the surface of the adsorbent by combining with nitrogen-containing functional groups through chelation.