Absorbencies of KLPAAM Superabsorbent Composite in Metal Ion Solution
A kaolin/sodium lignosulfonate graft acrylic acid and acrylamide superabsorbent composites(KLPAAM) prepared by solution polymerization are used for the equilibrium absorbency test of KLPAAM superabsorbent composite in different metal ion salt solutions. The effects of the solution concentrations on the equilibrium absorbencies in CuCl2, ZnCl2, FeCl3 and AlCl3 solutions are in order: CuCl2<ZnCl2<FeCl3<AlCl3. The solution concentrations and the pH values have an important effect on the equilibrium absorbencies. There are different pH values, 3.0 in FeCl3 and ZnCl2, 4.25 in AlCl3 and 6.0 in CuCl2 solution when the equilibrium absorbencies quickly increase with the pH values of the solutions. And then they reach their relative define values, in which the pH value is 3.8 in FeCl3, 3.5 in ZnCl2 and 5.5 in AlCl3 solution. The absorbency obviously increases again when the pH value is larger than 7.0 in ZnCl2 solution. They are slightly affected by the solution temperatures, that is, slightly decreases with increasing solution temperatures.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
X. J. He et al., "Absorbencies of KLPAAM Superabsorbent Composite in Metal Ion Solution", Advanced Materials Research, Vols. 236-238, pp. 297-300, 2011