Abstract
The aim of this study was to develop a sugarcane bagasse (SCB)-based biodegradable superabsorbent hydrogels (SAH) with a good swelling. To this end, SCB was firstly mechanically activated by home-made high efficiency stirring mill to enhance its reactivity by breaking the lignin seal and decreasing crystallinity of cellulose in SCB. Then, the SAH were synthesized by graft copolymerization of acrylic acid (AA) onto SCB with different mechanical activation times (t M) by using ammonium persulfate/sodium sulfite redox pair as an initiator in the presence of a crosslinker (N,N′-methylenebisacrylamide, MBAAm). The effect of t M on the equilibrium swelling capacity (Q eq), swelling kinetics of the SAH in deionized water, as well as the influences of pH, electrolytic media, and temperature on Q eq were studied. In addition, the products were characterized by scanning electron microscopy and differential scanning calorimetry. The results showed that mechanical activation promoted the graft copolymerization and thereby altered the Q eq of the SAH. The swelling process of the SAH exhibited anomalous swelling behavior and first-order dynamics, and the Q eq of the SAH was pH, salt, and temperature dependent.
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