Abstract
A palygorskite/poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-acrylamide) (PGS/P(AMPS-co-AM)) superabsorbent hydrogel was prepared in aqueous solution using glow-discharge electrolysis plasma (GDEP) as an initiator and N,N′-methylene-bis-acrylamide as a cross-linker. A possible copolymerization mechanism initiated by GDEP was proposed. The structure, thermal stability, and morphology of PGS/P(AMPS-co-AM) were characterized by FT-IR, XRD, TG-DTG, and SEM. The swelling kinetics, pH-reversibility, and influence of various pH and salt solutions on the swelling were investigated. Adsorption kinetics and adsorption mechanism of hydrogel for dyes were studied in detail. The results indicated that the equilibrium swelling of hydrogel is 652.6 g g−1 in distilled water. The swelling of the hydrogel in salt solutions from highest to lowest is Na+ > Mg2+ > Fe3+. The hydrogel has pH-reversibility responsive to the pH and salts solutions. The adsorption process of dyes follows the pseudo-second-order kinetic model with multi-step diffusion process. In addition, PGS/P(AMPS-co-AM) hydrogel can be regenerated and reused.
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Acknowledgments
This work was supported in part by National Natural Science Foundation of China (no. 21367023), Natural Science Foundation of Gansu Province (nos. 1308RJZA144 and 1208RJZA161), Scientific Research Project in Higher Education Institutions of Gansu Province (no. 2013-019), and Key Project of Young Teachers’ Scientific Research Promotion of Northwest Normal University (no. NWNU-LKQN-12-9), China.
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Yu, J., Zhang, H., Li, Y. et al. Synthesis, characterization, and property testing of PGS/P(AMPS-co-AM) superabsorbent hydrogel initiated by glow-discharge electrolysis plasma. Colloid Polym Sci 294, 257–270 (2016). https://doi.org/10.1007/s00396-015-3751-0
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DOI: https://doi.org/10.1007/s00396-015-3751-0