The Study On Modification Of Cellulose By ATRP And Its Application In Water Treatment

Cellulose as the most abundant natural polymer material,has been widely concerned in various fields due to its biocompatibility and biodegradability.It is possible to obtain cellulose materials with unique properties by graft modification without changing its inherent characteristics,which presents the broad application potential.In this study,using the advantage of controlled/living polymerization of atom transfer radical polymerization(ATRP),The amide molecules and N-halide molecules were evenly grafted on the cellulose chain backbone with the ionic liquid as the reaction medium.The adsorption performance for heavy metal ions and antibacterial property of materials were obtained.The acrylamide molecular was grafted onto the microcrystalline cellulose chain backbone by ATRP in ionic liquid 1-allyl-3-methyl-imidazole chloride([AMIM]Cl)to obtain the polymer MCC-g-PAM.The optimum process conditions were tested by orthogonal design;The molecular structure of the grafting polymer was confirmed by FT-IR and ¹H NMR.SEM indicated that its surface is fluffy,porous so that the big contact area is beneficial to the adsorption process.Cu²⁺and Cr⁶⁺were used as experimental metal ions,and the adsorption properties of MCC-g-PAM were tested by UV spectrophotometry.The result shows that the adsorption behavior of MCC-g-PAM for two metal ions is in accordance with the quasi-second-order kinetic equation,belongs to chemisorption.The maximum adsorption capacity of Cu²⁺and Cr⁶⁺were 65.03 mg/g and 103.12 mg/g,respectively,which was higher than that of microcrystalline cellulose material and presented the perfect regeneration performance.The MCC-g-PHAM were obtained by grafting N-methylol acrylamide onto the microcrystalline cellulose backbone by ATRP method.The obtained sample was halogenated to obtain the N-halamine graft polymer.The reaction conditions were optimized and the polymer structure was confirmed by FT-IR and¹H NMR.The antibacterial properties of halogenated MCC-g-PHAM were tested using plate colony counting method with Escherichia coli and Staphylococcus aureus.The results shows that the halogenated MCC-g-PHAM possessed the better antibacterial properties to Escherichia coli than to Staphylococcus aureus.The antibacterial properties was enhanced with increasing of chlorine in the graft cellulose material to Escherichia coli and Staphylococcus aureus.When the sample concentration reached 50?g/m L the survival rate of the two strains decreased to 0%.In addition,the regeneration performance of halogenated MCC-g-PHAM was perfect.