Straw-based superabsorbent resin (SAR) was fabricated via aqueous solution polymerization using cellulose extracted from wheat straw as the backbone,acrylic acid (AA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as the hydrophilic monomers,and N,N-methylenebisacrylamide and potassium persulfate as the cross-linking agent and initiator,respectively.The optimal preparation conditions were determined through single-factor experiments.The microscopic morphology,structure,and thermal stability of the straw-based superabsorbent resin were characterized using scanning electron microscopy (SEM),Fourier transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD),and thermogravimetric analysis (TGA).Additionally,its water retention properties and biodegradability were investigated.The results showed that the maximum water absorbency of the straw-based superabsorbent resin prepared under optimal conditions was 855.69g/g in distilled water and 114.52g/g in 0.9% saline solution.The hydrophilic monomer AA and AMPS were successfully grafted onto the wheat cellulose,and the SAR surface was rough and porous.The soil still had water retention capacity after 20 days of SAR addition,and the degradation rate was as high as 57.3% after being buried for 30 days,indicating excellent water retention and biodegradability.
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基金资助
国家自然科学基金(22166023)
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