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Carbonaceous microsphere‐based superabsorbent polymer as filler for coating of NPK fertilizer : fabrication, properties, swelling, and nitrogen release characteristics

Ahmed Khan, Tanveer and Munirah Ezzah, Tuan Zakaria and Kim, Hyun-Joong and Suriati, Ghazali (2020) Carbonaceous microsphere‐based superabsorbent polymer as filler for coating of NPK fertilizer : fabrication, properties, swelling, and nitrogen release characteristics. Journal of Applied Polymer Science, 137 (8). pp. 1-8. ISSN 0021-8995 (print); 1097-4628 (online)

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Abstract

Recently, the use of controlled release fertilizers in agriculture has resulted in huge benefits in plant growth and cultivation. Superabsorbent polymer (SAP)‐coated fertilizers have the added advantage in retaining water in soil after irrigation and also reduce the nutrient release rate from soil in a controlled manner. This study aimed to produce a nitrogen–phosphorus–potassium (NPK) fertilizer coated with superabsorbent carbonaceous microspheres polymer (SPC) by inverse suspension polymerization method with water‐retention and controlled release properties. Two sets of experiments were conducted: (1) three different weight percentages and (2) different materials. NPK coated with SPC showed increasing water‐retention ability with respect to carbon microsphere percentages and retains >80% water at the 30th day of experiment compared with pure NPK and NPK coated with SAP. The slow release behavior of all samples was investigated by induced coupled plasma mass spectrometry spectrometry and results showed that NPK coated with SAP and SPC has a low release rate with <50% nutrient release compared with uncoated NPK at the 30th day. The release mechanism kinetics of NPK coated with SAP and SPC were studied based on the Kosmeyer–Peppas model. The mechanisms approached Fickian diffusion‐controlled release as the n value for both samples was less than 0.5.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Controlled release fertilizer (CRF); Hydrothermal carbonization (HTC); Superabsorbent carbonaceous microsphere polymer (SPC); Superabsorbent polymer (SAP)
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Institute of Postgraduate Studies
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 27 Mar 2020 00:40
Last Modified: 27 Mar 2020 00:40
URI: http://umpir.ump.edu.my/id/eprint/27255
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