Montmorillonite/Tripolyphosphate Crosslinked Chitosan Nanocomposites for Eco-Friendly Agricultural Applications

Abstract:

Natural montmorillonite (MMT) was facilely impregnated with a mixed solution of protonated chitosan (CS) and KNO₃, which was then subsequently impregnated with sodium tripolyphosphate (TPP) to ionically crosslink with chitosan, resulting in the MMT/xCS-20KNO3-TPP nanocomposites. The initial content of chitosan to MMT was varied from 2.5, 5 and 10 wt%, and while the TPP:chitosan weight ratio was kept at 1:5. The K⁺ and NO₃^- ions interacted ionically and were entrapped in the MMT basal spacing and the free volume of TPP crosslinked chitosan of the MMT/xCS-20KNO3-TPP nanocomposites. These nanocomposites were able to successfully prolong the K⁺ and NO₃^- releases, in which the cumulative released values (%R) ranging from 21 – 26 % for K⁺ and 0.37 – 0.65 % for NO₃^-. The presence of protonated amine in the chitosan played the dominant effect on the release profile of NO₃^- ion more than that of the K⁺ ion. The higher the chitosan content employed in the impregnation method, the more crosslinked chitosan structure in the MMT/xCS-20KNO3-TPP nanocomposites, resulting in decreased K⁺ and NO₃^- releases at each pre-determined soaking duration. The MMT/xCS-20KNO3-TPP nanocomposites have been considered as a promising choice for environmentally friendly fertilizers.

• Periodical: Materials Science Forum (Volume 1098)
• Pages: 83-87
• DOI: https://doi.org/10.4028/p-RRmXv7
• Online since: September 2023
• Authors: Punnama Siriphannon*, Suthida Rungkron, Sunisa Soetsom, Suriya Sukyee
• Keywords: Chitosan, Impregnation, Montmorillonite, Nanocomposites, Slow-Release Fertilizer

References

[1] D. Tilman, K.G. Cassman, P.A. Matson, R. Naylor and S. Polasky: Nature. Vol. 418 (2002), p.671

DOI: 10.1038/nature01014

[2] K. H Sabry, in: Synthetic fertilizers, role and hazards in, edited by S. Sinha, volume 5 of Fertilizer Technology I Synthesis, chapter, 7, Studium Press LLC (2015).

[3] J.C. Cole, M.W. Smith, C.J. Penn, B.S. Cheary and K.J. Conaghan: Sci. Hortic. Vol. 211 (2016), p.420

[4] A.J. Messiga, K. Dyck, K. Ronda, K. Van Baar, D. Haak, S. Yu and M. Dorais: Plants. Vol. 9 (2020), p.1530

DOI: 10.3390/plants9111530

[5] R. Prasad, A. Bhattacharyya, Q.D. Nguyen: Front. Microbiol. Vol. 8 (2017), p.1014

[6] R. Chatterjee: Sci. Technol. Vol. 43 (2009), p.1659

[7] M.C. Kundu, B. Mandal: Sci. Technol. Vol. 43 (2009), p.5837

[8] S. Shoji, J. Delgado, A. Mosier, Y. Miura: Commun. Soil Sci. Plant Anal. Vol. 32 (2001), p.1051

[9] C. Kaemkit, P. Monvisade, P. Siriphannon and J. Nukeaw: J. Appl. Polym. Sci. Vol. 128 (2013), p.879

DOI: 10.1002/app.38255

[10] S. Lawchoochaisakul, P. Monvisade and P. Siriphannon: Carbohydr. Polym. Vol. 253 (2021) 117230

[11] P. Tepmatee, P. Siriphannon: Mater. Res. Bull. Vol. 48 (2013), p.4856

[12] S. Vaewbundit and P. Siriphannon: Soft solution in situ synthesis of chitosan/iron oxide nanocomposites and their magnetic properties. Soft Matter. Vol. 17 (2021), p.6238

DOI: 10.1039/d1sm00381j

[13] S. Vaewbundit and P. Siriphannon: Nanocomposites. Vol. 8 (2022), p.142

[14] M.E. Trenkel: Slow- and controlled-release and stabilized fertilizers: An option for enhancing nutrient use efficiency in agriculture, Second edition (IFA, France 2010).