Preparation Of Magnetic Conjugated Porous Polymer And Its Application In Dye Adsorption And Catalytic Degradation Of Nitrophenol

Conjugated porous polymers（CPPs）are a new class of materials in the family of polymer materials.CPPs are widely used in gas adsorption and storage,electrochemical energy storage,chemical sensing,catalysis,sewage treatment and metal ion adsorption due to itsπ-πconjugated network skeleton structure,porous structure,high specific surface area and easy to be functionalized.Because of the excellent properties and the diversity of monomers of conjugated porous polymers,selecting different structural monomers and functionalized the conjugate skeleton of CPPs to expand their application range have attracted much attention.Therefore,exploring different structure monomers and functionalized conjugated skeleton to prepare conjugated porous polymers with different properties has important application value and significance.In this paper,magnetic conjugated microporous polymers（MCMP）and superparamagnetic conjugated porous polymers（SCPPs）were prepared by covalently combining functionalized magnetic nanoparticles with conjugated porous polymers using different ligands and functional modification methods.In addition,the super-paramagnetic conjugated porous polymer was further functionalized by trithiocyanuric acid（TMT）to prepare a high efficient and rapid catalyst for the reduction and degradation of nitrophenol（SCPPs-TMT@Ag）.The main research contents are as follows:A magnetic conjugated microporous polymer（CMP）composite was designed with bromo groups of CMP and amino groups on the surface of Fe₃O₄ nanoparticles that acted as promising adsorbents for wastewater treatment.Fe₃O₄ nanoparticles were successfully bonded on the predesigned CMP material to form a hybrid material（MCMP）by means of a new and simple nucleophilic substitution reaction in organic media.The magnetic composite material could be separated by applying an external magnetic field because of Fe₃O₄ nanoparticles.The MCMP composite materials exhibited sufficient dye adsorption for methylene blue（MB）with a high sorption capability of 869.43 mg/g in aqueous solutions.The recovery and reusability of MCMP were above 70%after six cycles of desorption and regeneration,indicating that the MCMP had excellent cycle stability.The MCMP possessed excellent adsorption capacity,dispersibility,and good recyclability.The perfect properties of MCMP indicated that they could be used for a adsorbent with great application potential in quickly separated water pollutants such as dyes in the wastewater treatment.Magnetic conjugated porous polymers（CPPs）have attracted more attention because of their porosity,low mass density and fast magnetic separation performances.But the magnetic properties of most magnetic materials were intolerable and would decline rapidly under acidic conditions.Consequently,developing an acidity-resistant magnetic CPPs was very valuable for acid sewage treatment.In this work,the acidity-resistant superparamagnetic CPPs（SCPPs）were prepared through a palladium-catalyzed Sonogashira-Hagihara conjugate cross-coupling reaction and applied for dye adsorption.Comparing with other dye adsorption materials,SCPPs not only demonstrated better adsorption performance（740.12 mg/g）for methylene blue,but also possessed excellent magnetic property even in low pH values（pH=3）which was beneficial for the separation of SCPPs after adsorption.This work proposed a novel method for constructing an acid-resistant superparamagnetic porous material,which could be used as a potential high-efficiency adsorbent for acidic wastewater.Conjugated porous polymers（CPPs）have attracted much attention due to their wide applications in electrochemical,energy storage,light harvesting and photocatalysis,heterogeneous catalysis,absorption of hazardous material.Here,a SCPPs-TMT@Ag catalysis was successfully prepared by thiol-yne click reaction with TMT and superparamagnetic conjugated porous polymers（SCPPs）,TMT and porous channel are acted as capture sites for silver ions and employed as catalysis for the application of catalytic reaction of nitrophenol.The results indicated that SCMPs-TMT possessed a high adsorption capacity of silver ions,and the catalytic efficiency of SCMPs-TMT@Ag was still as high as 87%after eight cycles.The experimental result indicated that SCMPs-TMT@Ag composites can be used as an effective and reusable catalyst for water environment treatment.