Synthesis And Properties Of Amino Functionalized Ordered Mesoporous Phenolic Resin Materials

Ordered mesoporous polymer materials have been widely concerned since Mobil reported in 1992,breaking the pore limitation of porous zeolite materials and broadening the available range of pore materials,which has become a hot topic in academia.one.Because of its large specific surface area,arranged in a uniform and uniform channels,the pore size can be continuously adjusted in the range of 2-50 nm and so on.It has great potential in separation and purification,biological materials,catalysis and new assembly materials.Functionalized mesoporous materials,especially amino functionalized mesoporous materials,are widely used in alkali catalysis,adsorption separation and capacitors because of their amino modification.In this paper,the solvent-induced self-assembly technique combined with lowtemperature thermal polymerization was used to prepare amino-functional mesoporous phenolic resin with low cost,good hydrophobicity,high stability and strong alkali resistance.In situ one-step reduction method was used to synthesize Functional phenolic resin with microporous mesoporous structure,and use it as solid base catalyst,heavy metal ion adsorbent and metal nanoparticle carrier in related field.The structureactivity relationship of the materials was studied by a series of characterization techniques and preliminary application.The work described in this paper is divided into the following two parts:1.We used alkali alcohol solution instead of alkali aqueous solution,effectively overcome the shortcomings of m-nitrophenol-formaldehyde difficult polymerization,the successful synthesis of molecular weight moderate m-nitrophenol-formaldehyde monomer.The prepolymer and the triblock copolymer F127 were mixed and stirred by the H-bond interaction between the phenolic hydroxyl group and the template in the raw material,and the prepolymer-surfactant was subjected to solvent evaporation selfassembly After the low temperature heat polymerization technique,the m-nitrophenolformaldehyde-F127 phenolic resin complex was pyrolyzed to remove the surfactant in a nitrogen atmosphere,and the presence of a reducing gas such as CO and CH4 produced at the time of pyrolysis The-NO2 in the benzene ring was directly reduced to-NH2,and 100% amino functionalized mesoporous phenolic resin was successfully synthesized.The synthesis method effectively overcomes the shortcomings of the intermethylphenol insoluble in alkaline aqueous solution,the formation of schiff base and amino-phase hydrogen bonds with amino groups,and the first has a twodimensional hexagonal mesoporous structure,large specific surface area and uniform pore size distribution,high content of amino(5.0 wt%)of the mesoporous phenolic resin material.The synergistic effect of-NH2 with the phenolic hydroxyl Ph-OH group on the surface of the mesoporous channel shows good catalytic activity and thermodynamics and chemical stability in the Knoevenagel condensation test with water as the solvent at room temperature.The protonated amino functionalized phenolic resin showed a higher adsorption efficiency of 125(mg/g)for Cr(VI).Therefore,the synthesized amino functionalized mesoporous phenolic resin material has a high application prospect in catalyzing the adsorption of heavy metal ions.2.In order to solve the problem that the palladium nanoparticles catalyst particles are large and the utilization ratio of the active sites is low,this part utilizes the strong coordination affinity of NH2-for most metals to prevent agglomeration and does not interfere with the activity of the catalyst.The mixture was mixed with metal palladium ions by solution impregnation method,and the composite was prepared by briefly reducing the sodium borohydride to obtain the amino functionalized mesoporous phenolic resin containing palladium nanoparticles.The presence of amino groups in the material plays a good dispersion and stabilization of the metal palladium.The obtained materials maintain the ordered two-dimensional hexagonal mesoporous structure,and the prepared metal palladium nanoparticles have a small size(2 nm)and uniformity,high dispersion and controlled content(0.5 wt%-2.5 wt%).The The catalyst exhibits excellent activity(> 99%)in the coupling reaction involving boric acid and halogenated aromatics and the reduction reaction of nitroaromatics.The catalyst has a high activity after repeated use of seven times,showing that it has a high stability.