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

• Published in: Journal of applied polymer science Vol. 123; no. 4; pp. 2291 - 2298
• Main Authors: Bortolin, Adriel, Aouada, Fauze A., de Moura, Márcia R., Ribeiro, Caue, Longo, Elson, Mattoso, Luiz H. C.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15-02-2012; Wiley; Wiley Subscription Services, Inc
• 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; adsorption; Swelling; Control release polymer; Cellulose(methyl); Phosphate fertilizer; Semiinterpenetrating polymer network; Experimental study; Organic adsorbent; Free radical polymerization; Preparation; Cellulose derivatives; controlled-extended release of fertilizers; polysaccharide hydrogels; Acrylamide polymer; Oside polymer; conductimetric measurements; Hydrogel; Nitrogen fertilizer; Cellulose ether; Release; swelling degree
• ISSN: 0021-8995; 1097-4628; 1097-4628
• DOI: 10.1002/app.34742

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