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Thermal post-treatment alters nutrient release from a controlled-release fertilizer coated with a waterborne polymer.

Zhou Z, Du C, Li T, Shen Y, Zhou J - Sci Rep (2015)

Bottom Line: Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear.The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect.The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.

ABSTRACT
Controlled-release fertilizers (CRF) use a controlled-release technology to enhance the nutrient use efficiency of crops. Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear. In this study, a waterborne polyacrylate-coated CRF was post-treated at different temperatures (30 °C, 60 °C, and 80 °C) and durations (2, 4, 8, 12, and 24 h) after being developed in the Wurster fluidized bed. To characterize the polyacrylate membrane, and hence to analyze the mechanism of nutrient release, Fourier transform mid-infrared spectroscopy, scanning electron microscopy, and atomic force microscopy were employed. The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect. The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action. CRF equipped with specified nutrient-release behaviors can be achieved by optimizing the thermal post-treatment parameters, which can contribute to the development and application of waterborne polymer-coated CRF and controlled-release technologies.

No MeSH data available.


FT-IR spectra of the coating membranes from the waterborne polyacrylate-coated CRF under different post-treated temperatures and times.(A,B), spectra of membranes at four mirror velocities post-treated under 30 °C (A) and 80 °C (B) for 24  h each; (C–F), spectra of CRF membranes at 0.16 cm s−1 moving mirror velocity that were post-treated at three temperatures (30 °C, 60 °C, and 80 °C) for 2 h (C), 8 h (D), and 24 h (E), and at 80 °C for five durations (2, 4, 8, 12, and 24 h) (F).
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f3: FT-IR spectra of the coating membranes from the waterborne polyacrylate-coated CRF under different post-treated temperatures and times.(A,B), spectra of membranes at four mirror velocities post-treated under 30 °C (A) and 80 °C (B) for 24  h each; (C–F), spectra of CRF membranes at 0.16 cm s−1 moving mirror velocity that were post-treated at three temperatures (30 °C, 60 °C, and 80 °C) for 2 h (C), 8 h (D), and 24 h (E), and at 80 °C for five durations (2, 4, 8, 12, and 24 h) (F).

Mentions: The FT-IR was used to detect the composition of the coating membrane. The FT-IR spectra of the coating membranes had several similar functional groups: O–H and N–H stretching vibration (3250–3550 cm−1), C–H stretching vibration (~2850 cm−1), C = O stretching vibration (~1730 cm−1), C–H bend vibration (~1450 cm−1), and C–O stretching vibration (~1160 cm−1) (Fig. 3). However, there were some differences among the spectra. Calculations were made for the profiling depth of the membranes:


Thermal post-treatment alters nutrient release from a controlled-release fertilizer coated with a waterborne polymer.

Zhou Z, Du C, Li T, Shen Y, Zhou J - Sci Rep (2015)

FT-IR spectra of the coating membranes from the waterborne polyacrylate-coated CRF under different post-treated temperatures and times.(A,B), spectra of membranes at four mirror velocities post-treated under 30 °C (A) and 80 °C (B) for 24  h each; (C–F), spectra of CRF membranes at 0.16 cm s−1 moving mirror velocity that were post-treated at three temperatures (30 °C, 60 °C, and 80 °C) for 2 h (C), 8 h (D), and 24 h (E), and at 80 °C for five durations (2, 4, 8, 12, and 24 h) (F).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4562308&req=5

f3: FT-IR spectra of the coating membranes from the waterborne polyacrylate-coated CRF under different post-treated temperatures and times.(A,B), spectra of membranes at four mirror velocities post-treated under 30 °C (A) and 80 °C (B) for 24  h each; (C–F), spectra of CRF membranes at 0.16 cm s−1 moving mirror velocity that were post-treated at three temperatures (30 °C, 60 °C, and 80 °C) for 2 h (C), 8 h (D), and 24 h (E), and at 80 °C for five durations (2, 4, 8, 12, and 24 h) (F).
Mentions: The FT-IR was used to detect the composition of the coating membrane. The FT-IR spectra of the coating membranes had several similar functional groups: O–H and N–H stretching vibration (3250–3550 cm−1), C–H stretching vibration (~2850 cm−1), C = O stretching vibration (~1730 cm−1), C–H bend vibration (~1450 cm−1), and C–O stretching vibration (~1160 cm−1) (Fig. 3). However, there were some differences among the spectra. Calculations were made for the profiling depth of the membranes:

Bottom Line: Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear.The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect.The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.

ABSTRACT
Controlled-release fertilizers (CRF) use a controlled-release technology to enhance the nutrient use efficiency of crops. Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear. In this study, a waterborne polyacrylate-coated CRF was post-treated at different temperatures (30 °C, 60 °C, and 80 °C) and durations (2, 4, 8, 12, and 24 h) after being developed in the Wurster fluidized bed. To characterize the polyacrylate membrane, and hence to analyze the mechanism of nutrient release, Fourier transform mid-infrared spectroscopy, scanning electron microscopy, and atomic force microscopy were employed. The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect. The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action. CRF equipped with specified nutrient-release behaviors can be achieved by optimizing the thermal post-treatment parameters, which can contribute to the development and application of waterborne polymer-coated CRF and controlled-release technologies.

No MeSH data available.