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Physically and Chemically Cross-Linked Poly(vinyl alcohol)/Humic Acid Hydrogels for Agricultural Applications.
- Source :
-
ACS omega [ACS Omega] 2023 Nov 15; Vol. 8 (47), pp. 44784-44795. Date of Electronic Publication: 2023 Nov 15 (Print Publication: 2023). - Publication Year :
- 2023
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Abstract
- The preparation method of hydrogels has a significant effect on their structural and physicochemical properties. In this report, physically and chemically cross-linked poly(vinyl alcohol) (PVA) networks containing humic acid (HA) were alternatively prepared by autoclaving (AC) and through glutaraldehyde (GA) addition, respectively, for agricultural purposes. PVA/HA hydrogels were comparatively characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, mechanical assays, scanning electron microscopy, swelling kinetics measurements, and water retention tests in soil. AC hydrogels showed a more homogeneous porous microstructure, higher swelling levels, and a better capacity to preserve the humidity of soil than those obtained by adding GA. Both PVA/HA hydrogels exhibited no phytotoxicity on cultivation trials of Sorghum sp. , but the plant growth was promoted with the GA-cross-linked network as compared to the effect of the AC sample. The release behavior of urea was modified according to the preparation method of the PVA/HA hydrogels. After 3 days of sustained urea release, 91% of the fertilizer was delivered from the AC hydrogel, whereas a lower amount of 56% was released for the GA-cross-linked hydrogel. Beyond the advantages of applying PVA/HA hydrogels in the agricultural field, an appropriate method of preparing these materials endows them with specific properties according to the requirements of the target crop.<br />Competing Interests: The authors declare no competing financial interest.<br /> (© 2023 The Authors. Published by American Chemical Society.)
Details
- Language :
- English
- ISSN :
- 2470-1343
- Volume :
- 8
- Issue :
- 47
- Database :
- MEDLINE
- Journal :
- ACS omega
- Publication Type :
- Academic Journal
- Accession number :
- 38046300
- Full Text :
- https://doi.org/10.1021/acsomega.3c05868