Application of Polysaccharide Hydrogels in Adsorption and Controlled-Extended Release of Fertilizers Processes

被引：63
作者：
Bortolin, Adriel [1 ,2 ]
Aouada, Fauze A. [2 ,3 ]
de Moura, Marcia R. [2 ,4 ]
Ribeiro, Caue [2 ]
Longo, Elson [3 ]
Mattoso, Luiz H. C. [2 ]
机构：
[1] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP, Brazil
[2] Embrapa Agr Instrumentat, CNPDIA, LNNA, Natl Nanotechnol Lab Agr, BR-13560905 Sao Carlos, SP, Brazil
[3] Sao Paulo State Univ, Inst Chem, Araraquara, SP, Brazil
[4] Univ Sao Paulo, Inst Phys, BR-13560970 Sao Carlos, SP, Brazil
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2012年 / 123卷 / 04期
基金：
巴西圣保罗研究基金会;
关键词：
adsorption; conductimetric measurements; controlled-extended release of fertilizers; polysaccharide hydrogels; swelling degree; WATER SORPTION BEHAVIOR; POLYACRYLAMIDE; ALGINATE; PESTICIDE; REMOVAL; NITRATE;
D O I：
10.1002/app.34742
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
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)(2)SO4 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)(2)SO4 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)(2)SO4/g hydrogel) and desorption (54.9 mg KH2PO4/g hydrogel and 49.5 mg (NH4)(2)SO4/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. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 2291-2298, 2012
引用
收藏
页码：2291 / 2298
页数：8
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