Synthesis, characterization and swelling behavior of superabsorbent wheat straw graft copolymers.
Swelling behavior is an important characteristic for superabsorbents. A wheat straw-based superabsorbent (WS-SAB) was prepared by graft copolymerization of acrylic acid, acrylic amide and dimethyl diallyl ammonium chloride onto the cellulose of wheat straw, and its swelling and deswelling behavior was investigated. The product had a water absorbency of 133.76 g/g in distilled water and 33.83 g/g in 0.9 wt.% NaCl solution. Fourier transform infrared spectroscopy and scanning electron microscopy indicated that the monomers were successfully grafted onto the wheat straw. The largest swelling capacity was at pH 6. The effect of ions on the swelling was in the order: Na(+)>K(+)>Mg(2+)>Ca(2+) and Cl(-)>SO(4)(2-). The swelling capacity did not change after several times of water absorption and release.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
Qian
Q
Li
Zuohao
Z
Ma
Qinyan
Q
Yue
Baoyu
B
Gao
Wenhong
W
Li
Xing
X
Xu
D000042:Absorption; D002482:Cellulose / Q000138:chemical synthesis / Q000737:chemistry; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000138:chemical synthesis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D055595:Mechanical Phenomena; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014908:Triticum / Q000737:chemistry*; D014866:Waste Products / Q000032:analysis*
D011108:Polymers; D012996:Solutions; D014866:Waste Products; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D012965:Sodium Chloride; D002482:Cellulose