Synthesis And Adsorption Studies Of Poly (Pyrrole Alkyl Biphenylol Acrylate)

The environment is polluted by the heavy metal ions, especial the discharge of wastewater. It has been engendering great endangerment for the human society. At the same time, many heavy metal ions in industry wastewater are very useful, and need to recycle. Therefore, via the molecule design, preparing the high-powered chelating adsorption materials that could not only effectively treat heavy metal ions in wastewater, but also availability separate and recycle heavy metal ions, have important environment protecting and resource recycling value. So we designed the resins which polyacrylates as the main chain, biphenylyl as the side chain and the pyrrole on the end of the side chain.Two novel kinds of N-[ω-(4-acryloyloxybiphenyleneoxy) alkyl]pyrrole and the relevant homopolymers were prepared by using 4,4'-biphenyldiol, dibromoalkyl, pyrrole, acryloyl chloride as the raw materials. And probed the synthesis route of monomers and homopolymers, then putted forward the reasonable route. The chemical structures of the products were confirmed by FT-IR, ~1H-NMR and elementary analysis. Polarizing Optical Microscopy (POM) equipped with hot-stage and differential scanning calorimeter (DSC) were employed to investigate phase behavior and thermal properties of the compounds. The results showed that the monomers were crystalline and the polymers were amorphous, and the transformations of monomers crystalline type have been happened during the heating and cooling. In addition, the thermal decomposition of polymers was studied by thermo-gravimetry under nitrogen environment. The beginning decomposition temperatures were upon 290℃, therefore the polymers all performed high thermal stability.The adsorption properties for the heavy metal ions were studied with the static method. The results showed that the resins of P4 and P6 had excellent adsorptive capacity for Co(Ⅱ),Cu(Ⅱ),Zn(Ⅱ), and had common adsorptive capacity for Hg(Ⅱ),Cd(Ⅱ),Pb(Ⅱ), but the adsorptive capacity for Mg(Ⅱ) was very bad. So the adsorptions of resins had selectivity for the heavy metal ions. And the dynamics of the resins for Cu(Ⅱ),Co(Ⅱ) have been investigated, the results indicated that the adsorption equilibrium time of P4 and P6 resins for Cu(Ⅱ) needed 2 hours, and the resins of P4 for Co(Ⅱ) needed 3 hours. And the isothermal adsorptions for Cu(Ⅱ) of P4 resins pointed out that it accorded with the Freundlic isothermal equation. Then the isothermal adsorptions for Co(Ⅱ) of P4 resins fingered out that it followed the Freundlich and Langmuir isothermal equations. The affections of the pH for the adsorptions have also been discussed, they made out that the adsorption capacities of P4 and P6 were increasing along with the elevation of the pH during 5-10 for Cu(Ⅱ),Zn(Ⅱ) and Co(Ⅱ), and they had the high-powered adsorption capacities when the pH=10, but could not affect the Cd(Ⅱ). In addition, the resins of P4 and P6 had excellent regeneration properties.