期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 145, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jtice.2023.104830
关键词
Saline -alkali soil; Superabsorbent polymer; Complexation reaction; Soil reclamation; Computed tomography
A salt-tolerant superabsorbent polymer (ST-SAP) was developed for use in saline-alkali soil. The ST-SAP exhibited excellent swelling capacity and stability under high salt conditions. Addition of ST-SAP to saline-alkali soil significantly extended the water retention time.
Background: Enhancing the water retention capacity of soil is an effective measure to curb soil salinization. Superabsorbent polymer (SAP) with a strong absorbing water ability is particularly suitable as a water-retaining agent in agriculture. However, their limited salt tolerance restricts their applicability in saline-alkali soil. Hence, this research aimed to develop a salt-tolerant superabsorbent polymer (ST-SAP) that can be utilized in saline -alkali soil.Methods: ST-SAP, prepared by using 2-acrylamide-2-methylpropanesulfonic acid (AMPS), acrylic acid (AA) and acrylamide (AM), was evaluated by swelling and reswelling experiments. The salt-tolerant mechanism of ST-SAP was studied by XPS, FT-IR and CT. The water retention capacity of saline-alkali soil, collected from Lop Nur of Xinjiang and containing 18.13 wt% total dissolved salt, was determined to validate the effectiveness of ST-SAP in high-salt soil.Significant Findings: The ST-SAP synthesized in this study exhibited excellent swelling capacity (69.04 g/g) under high salt condition. Notably, ST-SAP presented exceptional stability under high salt condition, due to the complexation reaction between Ca2+and its three hydrophilic groups (R-SO3H, R-COOH, R-CONH2). Moreover, when 2 wt% ST-SAP was added to the saline-alkali soil, the water retention time was extended to 28 days, confirming the efficacy of ST-SAP in saline-alkali soil.
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