Uitrasonic Synthesis, Swelling And Adsorption Properties Of Acrylic Ploymer Hydrogels

In the paper,we had prepared by ultrasonic method PVA-P?AA-co-AM?,SLS-P?AA-co-MAH?and GL-g-PAA/SLS hydrogel.They was analyzed by Fourier Transform Infrared Spectroscopy?FTIR?,Scanning Electron Microscopy?SEM?and Thermogravimetric Analysis?TA?.The swelling and adsorption properties in various factors like pH,temperature and time were studied,and the swelling behavior and the adsorption mechanism of heavy metal ions in aqueous solution were investigated.In chapter 2,the optimum ratio of PVA-P?AA-co-AM?hydrogel was optimized by orthogonal experiment.The experimental results showed that when the amount of initiator was 0.0087 g,acrylamide/acrylic acid ratio 4%,the amount of crosslinking agent 0.0011 g,the amount of polyvinyl alcohol 0.2g and the neutralization degree of AA 80%,the prepared hydrogel had the maximum swelling capacity,reaching in deionized water and 0.9% saline solution 1243 g.g-1 and 92 g.g-1,respectively.The testing of swelling properties showed that the PVA-P?AA-co-AM?hydrogel has good responsiveness on pH value,electrolyte solution and swelling time.The swelling behavior in aqueous solution is in accord with the Schott model and diffusion type is non-Fickon diffusion.The adsorption Co²⁺ ion results showed that the adsorption capacity of PVA-P?AA-co-AM?hydrogel on heavy metal Co²⁺ ions could reach 184 mg.g-1 and the adsorption behavior is spontaneous,multi-layer chemical adsorption.In chapter 3,the optimum ratio of SLS-P?AA-co-MAH?hydrogel was obtained by single factor experiment.The experimental results showed that when the sodium lignosulfonate was 0.11 g,the amount of initiator 0.0078 g,the amount of crosslinking agent 0.0026 g,maleic anhydride 0.25 g and the ammoniation degree of maleic anhydride 60%,the hydrogels prepared in aqueous solution had the maximum swelling capacity,reaching in deionized water and 0.9% saline solution 1328 g.g-1 and 110 g.g-1,respectively.The study of swelling performance showed that the above-mentioned hydrogel has good responsiveness on pH value,electrolyte solution and swelling time and adding sodium lignosulfonate can improve the SLS-P?AA-co-MAH?the swelling ability of hydrogel.The adsorption Ni²⁺ ion studies showed that the adsorption capacity of SLS-P?AA-co-MAH?hydrogel on heavy metal Ni²⁺ ion could reach 293 mg.g-1.The pseudo two order kinetic equation can be used to fit the swelling data in deionized water and the adsorption data on heavy metal Ni²⁺ ions,and the obtained theoretical values are in close agreement with the experimental values.In chapter 4,the optimum ratio of GL-g-PAA/SLS hydrogel was optimized by orthogonal experiment.The experimental results showed that when the glucan content was 0.2g,the amount of initiator 0.08 g,the amount of crosslinking agent 0.085 g,neutralization degree of acrylic acid 75% and sodium lignosulfonate 0.01 g,the hydrogels prepared in aqueous solution had the maximum swelling capacity,reaching in deionized water and 0.9% saline solution 974 g.g-1 and 87 g.g-1,respectively.The testing of swelling properties showed that the GL-g-PAA/SLS hydrogel has good responsiveness on pH value,electrolyte solution and swelling time.The characterization results indicated that dextran and sodium lignosulfonate successfully were introduced into the hydrogel system,forming a porous composite hydrogel.The adsorption Cu²⁺ ions result showed that the GL-g-PAA/SLS hydrogel has the best adsorption effect on heavy metal Cu²⁺ ion compared with GL-g-PAA,SLS-g-PAA hydrogel,reaching 221 mg.g-1.The Freundlich adsorption isotherm can be used to describe the adsorption behavior of GL-g-PAA/SLS hydrogel on heavy metal Cu²⁺ ions...