Effects of different lignins on absorption properties and pore structure of polyacrylic acid resin
2019
Zhang, Haonan | Ren, Hao | Qian, Shuang | Zhai, Huamin
Supramolecular crosslinked porous lignin-based polyacrylic acid was laboratory-synthesized by copolymerizing lignin-grafted acrylic acid of potassium persulfate as an initiator and N,N-methylene bisacryl amide as a crosslinker. The effects of lignin type on the absorbent properties and the pore structure were studied. The results showed that the addition of lignin affects the swelling behavior and the pore structure of the resin. Lignopyrogallol-grafted-polyacrylic acid resin (LP-g-PAA) exhibited the best absorption properties (2137 g/g) and the highest BET specific surface area. Furthermore, the swelling behavior of the resins complied with the Schott’s swelling kinetics model. The salt tolerance of the LP-g-PAA resin was studied, and the results were as follows: KCl > KNO₃ ≈ LiCl > K₂SO₄ > K₂CO₃ > CaCl₂ > FeCl₃.
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