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Nanomaterials 2019, 9(2), 183; https://doi.org/10.3390/nano9020183

Potential Sustainable Slow-Release Fertilizers Obtained by Mechanochemical Activation of MgAl and MgFe Layered Double Hydroxides and K2HPO4

1
Institut de chimie de Clermont-Ferrand (ICCF), Université Clermont Auvergne, Centre National Recherche Scientifique (CNRS), Sigma Clermont, F-63000 Clermont-Ferrand, France
2
Departamento de Química, Universidade Federal do Paraná, Caixa Postal 19032, Curitiba—PR, CEP-81531-980, Brazil
*
Authors to whom correspondence should be addressed.
Received: 14 December 2018 / Revised: 16 January 2019 / Accepted: 23 January 2019 / Published: 1 February 2019
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Abstract

This study describes the behavior of potential slow-release fertilizers (SRF), prepared by the mechanochemical activation of calcined Mg2Al-CO3 or Mg2Fe-CO3 layered double hydroxides (LDH) mixed with dipotassium hydrogen phosphate (K2HPO4). The effects of LDH thermal treatment on P/K release behavior were investigated. Characterizations of the inorganic composites before and after release experiments combined X-Ray diffraction (XRD), Fourier-transform infra-red spectroscopy (FTIR), solid-state nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The best release profile (<75% in 28 days and at least 75% release) was obtained for MgAl/K2HPO4 (9 h milling, 2:1 molar ratio, MR). Compared to readily used K2HPO4, milling orthophosphate into LDH matrices decreases its solubility and slows down its release, with 60% and 5.4% release after 168 h for MgAl/K2HPO4 and MgFe/K2HPO4 composites, respectively. Mechanochemical addition of carboxymethylcellulose to the LDH/K2HPO4 composites leads to a noticeable improvement of P release properties. View Full-Text
Keywords: slow-release fertilizers; mechanochemical activation; phosphates; potassium; layered double hydroxides slow-release fertilizers; mechanochemical activation; phosphates; potassium; layered double hydroxides
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Borges, R.; Wypych, F.; Petit, E.; Forano, C.; Prevot, V. Potential Sustainable Slow-Release Fertilizers Obtained by Mechanochemical Activation of MgAl and MgFe Layered Double Hydroxides and K2HPO4. Nanomaterials 2019, 9, 183.

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