pH值对高吸水树脂聚（丙烯酸盐-丙烯酰胺）吸液吸附性能影响

考察了溶液pH值对聚丙烯酸(盐)/丙烯酰胺高吸水树脂(PAAAM树脂)吸液性能和吸附Cu2 和Fe3 的影响.结果表明:(1)在蒸馏水中,当pH值从2增加到4时,PAAAM树脂的吸液倍率迅速增加;当pH值在4~10时,吸液倍率基本不变;在pH≥10时,吸液倍率迅速减小.在NaCl、Na2SO4和Na3PO4溶液中,当pH值从2增加到3时,三种电解质溶液中的吸液倍率相同;在pH值为3到12时,吸液倍率逐渐增加,且按盐溶液顺序QNaCl

Effect of pH on the Absorbency and Adsorption of Superabsorbent Poly ( Acrylate - co - Acrylamide)

The effects of solution pH on the absorbency and adsorption of PAAAM were investigated.In distilled water,the absorbency of PAAAM increases with increasing pH when pH=2~4,almost keeps constant in pH range of 4~10 and decreases with increasing pH when pH>10;while in electrolyte solutions,the absorbency increases with an increase of the solution pH until pH = 12.The absorbency tendency at the same pH follows: QNaCl12.The results show that the adsorption capacity of Cu2 onto PAAAM increased remarkably with an increase of pH value which was between 2.31 and 4.15;However,for the adsorption of Fe3 ,pH was between 1.0 and 2.07.