PSY-g-PAA/Na-MMT复合高吸水性树脂的制备及其对Cu^(2+)的吸附

Preparation of Psyllium Gum-g-Poly(acrylic acid)/Na-Montmorillonite Superabsorbent Composites and Its Adsorption Performance for Cu^(2+)

以欧车前胶(PSY)、丙烯酸(AA)和钠基蒙脱土(Na-MMT)为原料,过硫酸铵(APS)为引发剂,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,采用水溶液聚合法制备了欧车前胶接枝聚丙烯酸/钠基蒙脱土(PSY-g-PAA/Na-MMT)复合高吸水性树脂。考察了Na-MMT质量分数对复合高吸水性树脂吸水能力和Cu2+吸附量的影响,研究了树脂在不同浓度NaCl、MgCl2和AlCl3溶液中的溶胀行为。红外光谱结果表明:Na-MMT参与了接枝聚合反应,当Na-MMT质量分数为30%时,树脂达到最优吸水性能。复合高吸水性树脂对水溶液中Cu2+的吸附在15 min内可达到饱和吸附量的95%,60 min达到吸附平衡。

A series of psyllium gum-g-poly（acrylic acid）/Na-montmorillonite（PSY-g-PAA/Na-MMT） superabsorbent composites were prepared by free-radical graft copolymerization among psyllium gum（PSY）,acrylic acid（AA） and Na-montmorillonite（Na-MMT）,using ammonium persulfate（APS） as the initiator and N,N′-methylenebisacrylamide（MBA） as the crosslinker.Effects of Na-MMT mass fraction on the water absorption and the adsorption performance for Cu2＋ were investigated,and the swelling behaviors of the superabsorbents in various concentrations of NaCl,MgCl2 and AlCl3 solutions were studied.Infrared spectra confirmed that Na-MMT participated in polymerization reaction.The superabsorbent composite achieved the best water absorption when the mass fraction of Na-MMT was 30%.In addition,the adsorption of superabsorbent composites for Cu2＋ from aqueous solution can reach 95% of the saturation adsorption capacity during the initial 15 min,and can achieve adsorption equilibrium within about 60 min.