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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Souza, Josiane de Lima [1, 2] ; Chiaregato, Camila G. [1] ; Faez, Roselena [1]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Carlos, Lab Mat Polimer & Biossorventes, Campus Araras, Araras, SP - Brazil
[2] Acad Forca Aerea, Pirassununga, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. 26, n. 2, p. 670-679, FEB 2018.
Web of Science Citations: 1
Abstract

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 KNO3 and NPK. PHBSGMMt with 10 wt% of KNO3 or NPK processed by melting at 162 A degrees 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, KNO3, 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 KNO3 in water medium since the KNO3 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. (AU)

FAPESP's process: 14/06566-9 - Hybrid polymers for nutrients release: preparation, characterization and in situ evaluation of nutrients release in the soil
Grantee:Roselena Faez
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants