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Preparation of pH/temperature-responsive semi-IPN hydrogels based on sodium alginate and humic acid as slow-release and water-retention fertilizers

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Abstract

Herein, a semi-interpenetrating network (semi-IPN) hydrogel (SH/PNA) was prepared by simple free radical polymerization using N-isopropylacrylamide and 2-acrylamide-2-methylpropanesulfonic acid as monomers, poly(ethylene glycol) dimethacrylate as a crosslinking agent, and sodium alginate and humic acid as filled biomolecules. Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and rheometer were used to characterize the structure and properties of the samples. The effect of feeding ratios on the gel mass fraction and swelling properties of the SH/PNA hydrogel was explored to optimize its preparation conditions. The swelling behavior under different pH and temperatures was investigated. The experimental result showed that the SH/PNA hydrogel had excellent water absorption capacity and pH/temperature dual responsiveness. Moreover, SH/PNA hydrogel was used as a carrier of urea to prepare slow-release and water-retention fertilizer by in situ loading method, and slow-release properties of urea in water and soil were measured. Taking into account its good ability for controlled release and water retention, the WSRF was expected to be a promising low-cost, environmentally friendly fertilizer that can be used in agriculture and horticulture.

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Funding

The work was supported by Natural Science Project of Zhengzhou Science and Technology Bureau [Grant number 21ZZXTCX14]; the Innovative Funds Plan of Henan University of Technology [Grant number: 2021ZKCJ08]; the National Natural Science Foundation of China [Grant number: U1904171].

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  1. School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, 450001, People’s Republic of China

    Bingyan Hua, Hongliang Wei, Chunwang Hu, Yaqi Zhang, Shuai Yang, Gang Wang, Tao Guo & Jingjing Li

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  1. Bingyan Hua
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Contributions

All authors contributed to conception and design of the study. BH, CH and YZ performed material preparation, data collection, and analysis. SY, GW and TG prepared figures. The first draft of the manuscript was written by BH, HW and JL reviewed and edited the manuscript. All authors reviewed the manuscript.

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Correspondence to Hongliang Wei or Jingjing Li.

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Hua, B., Wei, H., Hu, C. et al. Preparation of pH/temperature-responsive semi-IPN hydrogels based on sodium alginate and humic acid as slow-release and water-retention fertilizers. Polym. Bull. 81, 4175–4198 (2024). https://doi.org/10.1007/s00289-023-04901-7

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