Synthesis Of PEGDA Cryogel And Its Adsorption Removal Of Cu(Ⅱ) And Dyes

With the continuous development of modern industry,water pollution has become an increasingly prominent problem.There are many types of pollutants in water,among which heavy metal ions and dyes are extremely harmful and have a wide range of pollution.It not only destroys the aquatic ecosystem but also seriously affects people’s daily life and health.Therefore,it is urgent to solve the problem of effectively removing heavy metal ions and dyes from water.The cryogel is widely regarded as an excellent adsorbent with great prospects due to its green and environmentally friendly property,high porosity,controllable pore size,large specific surface area,good mechanical stability and chemical stability.In this study,two cryogels,p(PEGDA-co-AGE)-IDA and p(PEGDA-co-MA),were prepared by the copolymerization of polyethylene glycol diacrylate(PEGDA)with allyl glycidyl ether(AGE)or maleic anhydride(MA),respectively.These cryogel media were used for the adsorption of heavy metal ions(such as Cu(II))and dyes(such as methylene blue(MB)and crystal violet(CV))from water.The detailed research content is as follows.PEGDA and allyl glycidyl ether(AGE)were used as the comonomers,N,N’-methylenebisacrylamide(MBAAm)was used as the crosslinking agent,ammonium persulfate(APS)was used as the initiator,tetramethylethylenediamine(TEMED)was used as the accelerator,and deionized water was used as the pore-forming agent to synthesize the p(PEGDA-co-AGE)cryogel.The expected cryogel,p(PEGDA-co-AGE)-IDA,was obtained by the modification of p(PEGDA-co-AGE)with iminodiacetic acid(IDA).The effects of monomer concentration and crosslinking agent content on the properties of the cryogel were studied.Then,the effects of AGE content and p H on the adsorption of Cu(II)were investigated.The results showed that the maximum adsorption capacity of p(PEGDA-co-AGE)-IDA for Cu(II)was 76.49mg/g,and the isothermal adsorption followed the Langmuir model.Moreover,the adsorption kinetics followed the pseudo-second-order kinetic model,and the adsorption capacity maintained 57.85 mg/g after 5 adsorption-desorption cycles.PEGDA and maleic anhydride(MA)as the functional monomers,N,N’-methylenebisacrylamide(MBAAm)was used as the crosslinking agent,ammonium persulfate(APS)was used as the initiator,tetramethylethylenediamine(TEMED)was used as the accelerator,and deionized water was used as the pore-forming agent to synthesize the p(PEGDA-co-MA)cryogel.The effects of monomer concentration and crosslinking agent content on the properties of the cryogel medium were studied.The results showed that at p H 7,the adsorption capacity of p(PEGDA-co-MA(30%))cryogel for MB and CV were 447.7 mg/g and 290.1 mg/g,respectively.Moreover,the isothermal adsorption followed the Langmuir model,and the adsorption kinetics followed the pseudo-second-order kinetic model,adsorption thermodynamics proves that the adsorption process is an exothermic reaction.The recovery study confirmed that the p(PEGDA-co-MA)cryogel had good reusability.