Study On Synthesis And Properties Of Acrylic-based Boron Removal Resins

Boron and its compounds are widely used in production and life,but excessive intake of boron will cause great harm to life.One of the effective methods to remove boron from water is adsorptive removal by using adsorbent resins.In this dissertation,three new boron removal resins were synthesized,and their sorption property for low concentration boric acid aqueous solution was investigated.1.One intermediate resin,PMA-DETA,was synthesized by aminating poly(methyl acrylate)resin(PMA)with diethylenetriamine,and then the PMA-DETA resin was reacted with epoxy propanol in the solvent of isopropanol to get the PMA-DETA-Gly resin.Another intermediate resin,PMA-EDA,was synthesized by aminating PMA with ethylenediamine,and then the PMA-EDA resin was reacted with glucose followed by reduction with sodium borohydride in the solvent of methanol to get the PMA-EDA-Glu resin.Results of water content and weak base exchange capacity test of PMA,PMA-DETA,PMA-EDA,PMA-DETA-Gly,and PMA-EDA-Glu showed that the PMA-DETA-Gly resin and PMA-EDA-Glu resin were successfully synthesized.Boric acid static adsorption test results showed that only the PMA-DETA-Gly resin and PMA-EDA-Glu resin could adsorb boric acid in aqueous solution,and the adsorption capacity of the PMA-DETA-Gly and PMA-EDA-Gluresin for boric acid with low concentration reached 7.70 mg/g and 8.51mg/g respectively.2.The weakly basic resin D330 was reacted with epoxy propanol in the solvent of isopropanol to get the D330-Gly resin.Results of water content,weak base exchange capacity,IR spectra,and element analysis tests showed that that the D330-Gly resin was successfully synthesized.Boric acid static adsorption test results showed that both the D330 resin and the D330-Gly resin could adsorb boric acid in aqueous solution.Adsorption thermodynamics of the two resins for low concentration boric acid solution and high concentration boric acid solution were investigated,and the dynamic adsorption and desorption of D330-Gly resin were carried out.The maximum adsorption capacity of D330 resin for boric acid at low concentration was 6.21 mg/g,and that of D330-Gly resin was11.73 mg/g.Adsorption kinetics study showed that the sorption rate of the D330-Gly resin for boric acid was faster than that of the D330 resin.The adsorption kinetics of boric acid onto D330 resin was in accordance with both the pseudo first-order adsorption kinetic model and the quasi second-order adsorption kinetic model.The adsorption kinetics of boric acid onto D330-Gly resin followed the quasi second-order adsorption kinetic model.The adsorption capacity of D330-Gly resin for boric acid reached 15.64 mg/mL(wet)during the dynamic adsorption,and the desorption rate amounted to 89.9% by desorption with 4 bed volumn of 1mol/L hydrochloric acid,which indicated that the regeneration performance of D330-Gly resin was good enough.3.The adsorption performance of Amberlite IRA 743 resin for boric acid solution with low concentration and high concentration was investigated,and the adsorption performance of several boron removal resins was compared.The results showed that the adsorption performance of Amberlite IRA 743 resin for boric acid was excellent and almost not effected with temperature.The three boron removal resins of PMA-DETA-Gly,PMA-EDA-Glu and D330-Gly showed excellent adsorption properties for low concentration boric acid solution.In particular,adsorption performance of the D330-Gly resin was better than that of Amberlite IRA743 resin in aqueous solutions with a boric acid concentration of less than 10 mg/L,which showed the potential use of the D330-Gly resin in industrial production.