期刊
CARBOHYDRATE POLYMERS
卷 92, 期 2, 页码 1367-1376出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.10.030
关键词
Superabsorbent polymer (SAP); Sustained release fertilizer; Sulfonated corn starch; Phosphate rock
资金
- National Science Foundation of China [20874032, 41071162]
- Project of Combination of Industry, Education and Research of Ministry of Education of Guangdong Province, China [2010B090400351]
Phosphate rock (PHR), a traditional fertilizer, is abundant, but is hard to be utilized by plants. To improve the utilization of PHR, and to integrate water-retaining and controlled-release fertilizers, an agricultural superabsorbent polymer based on sulfonated corn starch/poly (acrylic acid) embedding phosphate rock (SCS/PAA/PHR) was prepared. PHR can be suspended and well-dispersed in SCS/PAA by sulfonated corn starch (SCS). PHR and KOH were mixed in acrylic acid solution to provide phosphorus (P) and potassium (K) nutrients, respectively. Impacts on water absorption capacity of the superabsorbent were investigated. The maximum swelling capacity in distilled water or 0.9 wt.% (weight percent) NaCl solution reached 498 gg(-1) and 65 gg(-1) (water/prepared dry superabsorbent) respectively. Moreover, release behaviours of P and K in SCS/PAA/PHR were also investigated. The results showed that SCS/PAA/PHR possessed excellent sustained-release property of plant nutrient, and the SCS/PAA could improve the P release greatly. Besides, the XPS analysis was employed to study the relationship between PHR and superabsorbent polymer. (C) 2012 Elsevier Ltd. All rights reserved.
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