Application of polysaccharide hydrogels in adsorption and controlled-extended release of fertilizers processes

This article studied the applicability of poly(acrylamide) and methylcellulose (PAAm‐MC) hydrogels as potential delivery vehicle for the controlled‐extended release of ammonium sulfate (NH4)2SO4 and potassium phosphate (KH2PO4) fertilizers. PAAm‐MC hydrogels with different acrylamide (AAm) and MC co...

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Published in:Journal of applied polymer science 2012-02, Vol.123 (4), p.2291-2298
Main Authors: Bortolin, Adriel, Aouada, Fauze A., de Moura, Márcia R., Ribeiro, Caue, Longo, Elson, Mattoso, Luiz H. C.
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Cellulose and derivatives
Coherence
conductimetric measurements
Control systems
controlled-extended release of fertilizers
Desorption
Exact sciences and technology
Fertilizers
Hydrogels
Materials science
Mathematical analysis
Natural polymers
Organic polymers
Physicochemistry of polymers
Polymers
polysaccharide hydrogels
Properties and characterization
Releasing
Solution and gel properties
swelling degree
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Summary:This article studied the applicability of poly(acrylamide) and methylcellulose (PAAm‐MC) hydrogels as potential delivery vehicle for the controlled‐extended release of ammonium sulfate (NH4)2SO4 and potassium phosphate (KH2PO4) fertilizers. PAAm‐MC hydrogels with different acrylamide (AAm) and MC concentrations were prepared by a free radical polymerization method. The adsorption and desorption kinetics of fertilizers were determined using conductivity measurements based on previously built analytical curve. The addition of MC in the PAAm chains increased the quantities of (NH4)2SO4 and KH2PO4 loaded and extended the time and quantities of fertilizers released. Coherently, both loading and releasing processes were strongly influenced by hydrophilic properties of hydrogels (AAm/MC mass proportion). The best sorption (124.0 mg KH2PO4/g hydrogel and 58.0 mg (NH4)2SO4/g hydrogel) and desorption (54.9 mg KH2PO4/g hydrogel and 49.5 mg (NH4)2SO4/g hydrogel) properties were observed for 6.0% AAm–1.0% MC hydrogels (AAm/MC mass proportion equal 6), indicating that these hydrogels are potentially viable to be used in controlled‐extended release of fertilizers systems. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.34742