用聚(丙烯酸/丙烯酰胺)水凝胶吸附单价阳离子染料的研究

Study on the adsorption of monovalent cationic dye by poly(acrylic acid/acrylamide)hydrogels

研究了用聚 (丙烯酸 丙烯酰胺 ) [P(AAc AAm) ]水凝胶对较高较大浓度范围 (10 -6— 10 -2 mol L)的阳离子染料碱性藏花红 (SafranineT)溶液的吸附过程和水凝胶经解吸后的再吸附性质 .实验结果表明 :增大P(AAc AAm)水凝胶的交联度和电荷比值有利于吸附过程的进行 ,并强化了引发过程 (initiationprocess)而抑制了协同过程 (cooperativeprocess) .水凝胶经解吸后 ,其吸附能力大大地增强 ,复合度 (β)超过 1,约为 1 5 ,此时 。

The adsorption process of monovalent cationic dye molecules safranine T in a wide range of concentration(10^(-6)—10^(-2)?mol/L)on poly(acrylic acid/acrylamide)[P(AAc/AAm)]and the properties of desorbed P(AAc/AAm)hydrogels were studied.The experimental results showed that the increase in crosslinkage and charge density of P(AAc/AAm)hydrogels was favorable for adsorption and enhanced effectively the initiation process but strongly suppressed the cooperative process.After desorption of hydrogels,adsorption capacity was increased and the degree of binding(β)exceeded 1,almost reached 1.5.It had been found that adsorbed on desorbed hydrogels were more than that adsorbed on new hydrogels.At this time the cooperative and hydrophobic interaction between cationic dye molecules played a dominant role in adsorption process.