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Title: | Release Mechanisms and Kinetic Models of Gypsum-Sulfur-Zeolite-Coated Urea Sealed with Microcrystalline Wax for Regulated Dissolution |
Authors: | Eghbali Babadi, F Yunus, R Masoudi Soltani, S Shotipruk, A |
Issue Date: | 19-Apr-2021 |
Publisher: | American Chemical Society |
Citation: | Eghbali Babadi, F., Yunus, R., Masoudi Soltani, S. and Shotipruk, A. (2021) 'Release Mechanisms and Kinetic Models of Gypsum–Sulfur–Zeolite-Coated Urea Sealed with Microcrystalline Wax for Regulated Dissolution', ACS Omega, 6 (17), pp. 11144-11154 (11). doi: 10.1021/acsomega.0c04353. |
Abstract: | Copyright © 2021 The Authors. In this study, a mineral-based coated urea was fabricated in a rotary pan coater using a mixture of gypsum/sulfur/zeolite (G25S25Z50) as an effective and low-cost coating material. The effects of different coating compositions on the dissolution rate of urea and the crushing strength and morphology of the coated urea were investigated. A 25:25:50 (wt %) mixture of gypsum/sulfur/zeolite (G25S25Z50) increased the coating effectiveness to 34.1% with the highest crushing strength (31.06 N). The effectiveness of coated urea was further improved to 46.6% with the addition of a microcrystalline wax (3%) as a sealant. Furthermore, the release mechanisms of various urea fertilizers were determined by fitting the release profiles with six mathematical models, namely, the zeroth-order, first-order, second-order, Higuchi, Ritger & Peppas, and Kopcha models. The results showed that the release mechanism of the uncoated urea and all other coated urea followed the Ritger & Peppas model, suggesting the diffusional release from nonswellable delivery systems. In addition, due to the increased mass-transfer resistance, the kinetic constant was decreased from 0.2233 for uncoated urea to 0.1338 for G25S25Z50-coated urea and was further decreased to 0.0985 when 3% Witcovar 146 sealant was applied. |
Description: | Supporting Information: The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsomega.0c04353. Release of nitrogen content from uncoated urea and commercial sulfur-coated urea (SCU) determined by the HPLC method and the Kjedhal method (PDF). |
URI: | https://bura.brunel.ac.uk/handle/2438/24342 |
DOI: | https://doi.org/10.1021/acsomega.0c04353 |
Other Identifiers: | ORCID iD: Salman Masoudi Soltani https://orcid.org/0000-0002-5983-0397 |
Appears in Collections: | Dept of Chemical Engineering Research Papers |
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FullText.pdf | 7.21 MB | Adobe PDF | View/Open |
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