Synthesis Of Novel Hypercrosslinked Resin And Adsorption Of Phenols From The Aqueous Solution

Hypercrosslinked adsorption resin with high specific surface area, excellent porestructure and good adsorption properties has been widely used in modern adsorptiontechnology, including filtering phenols and aniline and other organic toxicants in industrialwastewater. In this thesis the synthesis of new HCPs and its adsorption properties wereresearched. The content of this article is composed of five parts as following:Part I: A novel non-polystyrene type hypercrosslinked resin (XDC-TPM resin) wassynthesized by copolymerization of1,4-bis (chloromethyl)-benzene (XDC) andtriphenylmethane (TPM) through Friedel-Crafts alkylation reaction in homogeneous solution.The optimized synthesis conditions were obtained by orthogonal experiments: the mole ratioof TPM and XDC is1:10, the pre-polymerization temperature is50°C, the XDCconcentration is0.30mol/L, the pre-polymerization time is5h and the mole ratio of thecatalyst FeCl3and TPM is0.6. The XDC-TPM resin, synthesized in the optimized conditions,has BET specific surface area of1685m2/g, the average pore size of2.67nm and porevolume of2.25mL/g.Part II: Aminoresin was prepared by introducing ethylenediamine onto the skeleton ofXDC-TPM resin. Its total exchange capacity is2.02mmol/g. Its pore distribution,microstructure and thermal properties of the resin were determined by the correspondingmeasures. Results showed that the resin has BET surface area of1172m2/g, average poreradius of2.02nm and total pore volume of1.18mL/g.Part III: The adsorption performance of XDC-TPM skeleton and aminoresin for phenoland p-nitrophenol in water has been studied. The isotherm, kinetics and thermodynamics ofadsorption were analyzed. The results showed that the Freundlich isothermal model andpseudo-second order kinetic model better fitted the adsorption behaviors. Furthermore,thermodynamic parameters showed that adsorption behavior of phenol was an exothermic,entropy reduction and non-spontaneous process; adsorption behavior of the p-nitrophenolwas an exothermic, entropy reduction and the spontaneous process.Part IV: By the Friedel-Crafts alkylation reaction, five different skeleton resins were synthesized. BET specific surface area, nitrogen stripping absorption curve and pore sizedistribution showed that five adsorption resins have high BET specific surface area andlarge pore volume. The specific surface areas of dry resins were proportional to the effectivespecific surface areas under swelling state, which were calculated by the adsorption ofmethylene blue dye.Part V: The adsorption performance of different skeleton resins for phenol andp-nitrophenol in water were studied. Isothermal analysis indicated the Freundlich isothermalmodel could be better fitted to the adsorption behaviors. Adsorption performance of resinwas related to the specific surface area, pore volume and pore diameter.