Salt-tolerant superabsorbent polymer (SAP) was synthesized to improve
the water retention properties of saline-alkali soil. The Lop Nur
saline-alkali soil of Xinjiang with high salinity (total dissolved salt:
18.13wt%) was the object of improvement. The good swelling capacity of
SAP (69.04 g/g) under high salinity condition contributed to the superb
slow-release water property and further
water retention property of SAP-saline-alkali soil (28 days), which
showed a good application potential of SAP in saline-alkali land. The
swelling mechanism under high salt condition was also explored. Notably,
owe to the complexation reaction between and three hydrophilic groups of
SAP, the swelling capability of SAP tended to keep steady when the
concentration of CaCl 2 exceeded 0.55wt%.
Interestingly, the distribution of the calcium salt in SAP was directly
displayed by the maximum intensity projection of computed tomography.