Urea Montmorillonite-Extruded Nanocomposites: A Novel Slow-Release Material

被引：128

作者：

Pereira, Elaine I. ^{[2
]}

Minussi, Fernando B. ^{[2
]}

da Cruz, Camila C. T. ^{[2
]}

Bernardi, Alberto C. C. ^{[3
]}

Ribeiro, Caue ^{[1
]}

机构：

[1] EMBRAPA Instrumentacao, BR-13560970 Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP, Brazil

[3] EMBRAPA Pecuaria Sudeste, BR-13560970 Sao Carlos, SP, Brazil

来源：

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2012年 / 60卷 / 21期

基金：

巴西圣保罗研究基金会;

关键词：

urea; fertilizer; montmorillonite; extrusion; intercalation; REFRACTORY CASTABLES; SANDY SOIL; FERTILIZERS; RETENTION; ZEOLITE; KAOLIN; BIURET;

D O I：

10.1021/jf3001229

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

The present study describes the preparation and characterization of a novel urea slow-release nanocomposite, based on urea intercalation into montmorillonite clay by an extrusion process at room temperature. Nanocomposites with urea contents ranging from 50 to 80 wt % were successfully produced and characterized. Analyses by XRD, DTA, and SEM-EDX confirmed the effectiveness of this simple process to exfoliate the clay lamellae into the urea matrix, forming a product that can be classified as a nanocomposite, due to the exfoliation degree attained. Diametral compression tests showed that the samples were very deformable, and the release rate of active components in water showed that the nanocomposite showed a slow release behavior for urea dissolution, even in low montmorillonite amounts (20% in weight).

引用

页码：5267 / 5272

页数：6

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