Optimization of the diameter and water absorption capacity of superabsorbent polymer beads for three-dimensional filtration
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The filtration process has been widely used in various industrial applications. To offer more interfacial area and promote the efficiency for the filtration process, a three-dimensional filtration process based on superabsorbent polymer (SAP) beads has been developed. Here in this study, a new two-step polymerization method was established to synthesize (acrylamide-co-acrylic acid) (AM-co-AA) SAP beads. Using this method, SAP beads with three different diameters (0.3 mm, 0.5 mm, and 1.0 mm) were produced. The composition of SAP beads was thoroughly studied. The molar ratio of the two monomers, the total concentration of the monomer solution, the pH of the monomer solution, and the crosslinking degree have significant effects on the water absorbency of SAP beads. After the composition study, SAP beads with three different water absorbencies (around 100, 300, and 500) were produced. The swelling behavior of each type of beads were studied by soaking in DI water or salt (NaCl) solution.