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. 2021 Dec 13;7(4):262.
doi: 10.3390/gels7040262.

Synthesis and Characterization of Slow-Release Fertilizer Hydrogel Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper

Semiu A Kareem  1 , Idayatu Dere  1 , Daniel T Gungula  2 , Fartisincha Peingurta Andrew  3 , Abdullahi M Saddiq  4 , Elizabeth F Adebayo  5 , Vadlya T Tame  2 , Haruna M Kefas  1 , Japari Joseph  6 , David O Patrick  1
Affiliations

Synthesis and Characterization of Slow-Release Fertilizer Hydrogel Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper

Semiu A Kareem et al. Gels. .

Abstract

In this study, biodegradable slow-release fertilizer (SRF) hydrogels were synthesized from hydroxyl propyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), glycerol and urea (SRF1) and HPMC, PVA, glycerol, urea and blended paper (SRF2). The fertilizer hydrogels were characterized by SEM, XRD and FTIR. The swelling capacity of the hydrogels in both distilled and tap water as well as their water retention capacity in sandy soil were evaluated. The hydrogels had good swelling capacity with maximum swelling ratio of 17.2 g/g and 15.6 g/g for SRF1 and SRF2 in distilled, and 14.4 g/g and 15.2 g/g in tap water, respectively. The water retention capacity of the hydrogels in sandy soil exhibited higher water retention when compared with soil without the (SRFs). The soil with the hydrogels was found to have higher water retention than the soil without the hydrogels. The slow-release profile of the hydrogels was also evaluated. The result suggested that the prepared fertilizer hydrogels has a good controlled release capacity. The blended paper component in SRF2 was observed to aid effective release of urea, with about 87.01% release in soil at 44 days compared to the pure urea which was about 97% release within 4 days. The addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed Schott's second order model. The release kinetics of urea in water was best described by Kormeye Peppas, suggesting urea release to be by diffusion via the pores and channels of the SRF, which can be controlled by changing the swelling of the SRF. However, the release mechanism in soil is best described by first order kinetic model, suggesting that the release rate in soil is depended on concentration and probably on diffusion rate via the pores and channels of the SRF.

Keywords: blended paper; hydrogel; hydroxy propyl methyl cellulose; polyvinyl alcohol; slow-release fertilizer.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
SEM Images of HPMC (A) SRF1 and (B) SRF2 (C).
Figure 2
Figure 2
Overlay FTIR spectra of Blended paper, HPMC, Urea, PVA, SRF 1 and SRF 2.
Figure 3
Figure 3
XRD patterns of blended paper (a), HPMC (b), SRF1 (c), SRF2 (d).
Figure 4
Figure 4
Swelling behaviors of hydrogels in solution.
Figure 5
Figure 5
Swelling kinetics of hydrogel in solution.
Figure 6
Figure 6
Water retention behaviour of sandy soil with and without hydrogel.
Figure 7
Figure 7
Release behavior of urea, srf1 without paper and srf2 with blended paper in water.
Figure 8
Figure 8
Kinetic parameters of each of the model used.
See this image and copyright information in PMC

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References

    1. Azeem B., KuShaari K., Man Z.B., Basit A., Thanh T.H. Review on materials & methods to produce controlled release coated urea fertilizer. J. Control. Release. 2014;181:11–21. - PubMed
    1. Jie C., Jing-Zhang C., Man-Zhi T., Zi-tong G. Soil degradation: A global problem endangering sustainable development. J. Geogr. Sci. 2002;12:243–252. doi: 10.1007/BF02837480. - DOI
    1. Brown M.E., Hintermann B., Higgins N. Markets, Climate Change, and Food Security in West Africa. Environ. Sci. Technol. 2009;21:8016–8020. doi: 10.1021/es901162d. - DOI - PubMed
    1. Mateo-Sagasta J., Zadeh S.M., Turral H. More People, More Food, Worse Water? A Global Review of Water Pollution from Agriculture. Food and Agriculture Organization of the United Nations (FAO); Rome, Italy: 2018.
    1. Azeem B., KuShaari K., Man Z. Effect of coating thickness on release characteristics of controlled release urea produced in fluidized bed using waterborne starch biopolymer as coating material. Procedia Eng. 2016;148:282–289. doi: 10.1016/j.proeng.2016.06.615. - DOI

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