Synthesis Of Zero-Valent Copper Particle Loaded Porous Polymer Foam And Their Application

Due to the advantages of low density, high specific strength, high specific surface, light weight, good permeability, heat insulation, and sound insulation, porous polymer materials are widely used in aerospace, medical, metallurgy, petrochemical engineering and other fields. There are many methods to prepare the porous materials, such as:solvent evaporation, fiber bonding, chemical induced phase separation method, gas foaming, concentrated emulsion template method and so on. Concentrated emulsion template has already been an effective measure to prepare porous materials because of easy operation and pore diameter control. Zero-valent metals are preponderant on purifying water, degradation of heavy metal pollutants in water such as Cr(VI) for its excellent reducibility. Porous materials can offer large specific surface area to improve the loading of zero-valent metals particalsto enlarge contact area between the zero-valent metals particals and the solution,which enhance the efficiency of purifying water. In this article, concentrated emulsion template method was used to synthesized porous materials with interconnected pore structure,regarding oil phase as the continuous phase, monomer(tert-Butyl acrylate),cross linking agent(divinyl benzene) and emulgator(span80) dissolving in the continuous phase, potassium peroxydisulfate as initiator, water as dispersed phase. The influence to pore structures by changing the dosage of emulgator was analysed. The primary pores diameter became minimum and secondary pores in materials are maximum when the dosage of emulgator is4%. Amine groups were anchored onto porous materials surface by surface modification. Adsorbed copper ions to amine groups by complexation, then loaded zero-valent copper particles to porous material surface by redox method. The degradation ability tests was used to evaluate the factors impacting Cr(VI) removal and this showed that the final removal efficiency of Cr(VI) decreased as weather the initial Cr(VI) concentration increased or pH value the decreased. The percentage of Cr(VI) removed was above99%.This article analyzed the behaviour of Cu0-PEI-PAA in removing Cr(VI). The concentration of Cr was dropped after the reaction, combined with XPS, which proved the process of Cr(VI) removal by Cu0-PEI-PAA porous material contains chemical reaction and physical adsorption. By calculating R2of curve fitting, removal reaction conformed to the pseudo first order kinetics.