Green Composite Based on PHB and Montmorillonite for KNO3 and NPK Delivery System

Controlled release fertilizer (CRF) as a safe system for reducing environmental pollution still remains as demand for the agribusiness. Natural and biodegradable polymer materials have been proposed as a prominent and sustainable controlled delivery system. Composite based on polyhydroxybutyrate (PH...

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Bibliographic Details
Published in:Journal of polymers and the environment 2018-02, Vol.26 (2), p.670-679
Main Authors: Souza, Josiane de Lima, Chiaregato, Camila G., Faez, Roselena
Format: Article
Language:English
Subjects:
Agribusiness
Biodegradability
Biodegradation
Chemistry
Chemistry and Materials Science
Composite materials
Controlled release
Environmental Chemistry
Environmental Engineering/Biotechnology
Fertilizers
Glycerol
Homogeneity
Industrial Chemistry/Chemical Engineering
Ion currents
Materials Science
Montmorillonite
Original Paper
Phase separation
Pollution control
Polyhydroxybutyrate
Polyhydroxybutyric acid
Polymer Sciences
Starch
Thermodynamic properties
Water pollution
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Summary:Controlled release fertilizer (CRF) as a safe system for reducing environmental pollution still remains as demand for the agribusiness. Natural and biodegradable polymer materials have been proposed as a prominent and sustainable controlled delivery system. Composite based on polyhydroxybutyrate (PHB), starch, glycerol and montmorillonite (PHBSGMMt) has been proposed as a carrier for controlled release fertilizers, such as KNO 3 and NPK. PHBSGMMt with 10 wt% of KNO 3 or NPK processed by melting at 162 °C, 60 rpm during 10 min in a mixer chamber of torque rheometer. Composites were characterized according to its structure by FTIR and XRD, in thermal behavior by TGA and DSC, and morphology by SEM. Fertilizers release in water was determined by ionic conductivity. Clay, KNO 3 , and NPK increased the PHB/starch compatibility and homogeneity, resulting in a well-interfaced material obtained for PHBSGMMTNPK. MMtKNO 3 was mainly on PHB phase and MMtNPK on the compatible polymeric phase. These behaviors explain the faster release of KNO 3 in water medium since the KNO 3 has high solubility and the phase separation creates fissures that turn in water pathway. Kinetic parameters classified the material as a non-Fickian diffusion or anomalous transport mechanism.
ISSN:1566-2543
1572-8919
1572-8900
DOI:10.1007/s10924-017-0979-4