title: Recovery of ammonium onto wheat straw to be reused as a slow-release fertilizer.
abstract: 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.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China.
authors.forename: Lihua
authors.initials: L
authors.lastname: Xie
authors.forename: Shaoyu
authors.initials: S
authors.lastname: Lü
authors.forename: Mingzhu
authors.initials: M
authors.lastname: Liu
authors.forename: Chunmei
authors.initials: C
authors.lastname: Gao
authors.forename: Xinggang
authors.initials: X
authors.lastname: Wang
authors.forename: Lan
authors.initials: L
authors.lastname: Wu
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000179:Acrylates / Q000737:chemistry; D000180:Acrylic Resins / Q000737:chemistry; D000327:Adsorption; D000383:Agriculture / Q000191:economics; D000476:Alkanesulfonates / Q000737:chemistry; D064751:Ammonium Compounds / Q000032:analysis / Q000191:economics / Q000302:isolation & purification*; D005240:Feasibility Studies; D005308:Fertilizers / Q000032:analysis / Q000191:economics; D055772:Green Chemistry Technology; D018547:Plant Stems / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D012995:Solubility; D014908:Triticum / Q000737:chemistry*; D014866:Waste Products / Q000032:analysis / Q000191:economics
chemical_list: D000178:Acrylamides; D000179:Acrylates; D000180:Acrylic Resins; D000476:Alkanesulfonates; D064751:Ammonium Compounds; D005308:Fertilizers; D012987:Soil; D014866:Waste Products; C056288:2-acrylamido-2-methylpropanesulfonate; C036658:acrylic acid