Recovery of Ammonium onto Wheat Straw To Be Reused as a Slow-Release Fertilizer

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• 作者：Lihua Xie ; Shaoyu L眉 ; Mingzhu Liu ; Chunmei Gao ; Xinggang Wang ; Lan Wu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2013
• 出版时间：April 10, 2013
• 年：2013
• 卷：61
• 期：14
• 页码：3382-3388
• 全文大小：314K
• 年卷期：v.61,no.14(April 10, 2013)
• ISSN：1520-5118

文摘

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^鈥? 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.

Keywords:

slow-release fertilizer; superabsorbent; wheat straw; multifunctional