Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 61, Issue 14, Pages 3382-3388Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf4004016
Keywords
slow-release fertilizer; superabsorbent; wheat straw; multifunctional
Funding
- National Natural Science Foundation of China [51273086, 31260500]
- Special Doctorial Program Fund from the Ministry of Education of China [20090211110004]
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With the aim of improving fertilizer use efficiency and minimizing the negative impact of nitrogen pollution, a new multifunctional slow-release fertilizer was prepared by recovery of ammonium from aqueous solutions onto a superabsorbent composite. An eco-friendly superabsorbent composite based on wheat straw (WS) was synthesized and used as the carrier to control the release of nutrients. The adsorption studies with NH4+ indicated that the superabsorbent composite showed good affinity for NH4+, with an adsorption capacity of 7.15 mmol g(-1) when 20 wt % of WS was incorporated and that the adsorption system can reach equilibrium within 40 min. Afterward, the feasibility of reusing the composite as a multifunctional slow-release nitrogen fertilizer was investigated. The results showed that the product with good water-retention and slow-release capacities could regulate soil acidity and was economical and eco-friendly for application in agriculture and horticulture.
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