Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
J Environ Manage. 2019 Jan 15;230:190-198. doi: 10.1016/j.jenvman.2018.09.086. Epub 2018 Oct 1.
Slow-release fertilizer has been proven to be more effective than traditional fertilizer for providing a long-term stable nutrient supply. Although such fertilizers have been widely investigated, their water-retention properties and biodegradability have not been fully analysed. Composites of fertilizers and polymers provide opportunities to prepare new types of fertilizer with enhanced properties for real applications. Chicken feather protein-graft-poly(potassium acrylate)-polyvinyl alcohol semi-interpenetrating networks forming a super absorbent resin combined with nitrogen (N) and phosphorus (P) (CFP-g-PKA/PVA/NP semi-IPNs SAR) was prepared. The chemically bonded or physically embedded fertilizer compound could be released form the resin matrix to the surrounding soil under irrigation. The synthesis mechanism, morphology, and chemical and mechanical structure of the synthesized composites were investigated. The reactant doses were optimized through response surface methodology (RSM). A 30-day field trial of the prepared SAR was applied to detect the influence of sample particle size, soil salinity, pH, and moisture content on the slow-release behaviour of N and P. The maximum release values of N and P from the composites were 69.46% N and 65.23% P. A 120-day soil burying experiment and 30-day Aspergillus niger (A. niger) inoculation were performed, and the biodegradability and change in microstructure were monitored. The addition of SAR to soil could also improve the water-retention ability of the soil.
缓释肥料已被证明比传统肥料更能有效地提供长期稳定的养分供应。尽管已经广泛研究了这种肥料，但它们的保水性能和生物降解性尚未得到充分分析。肥料和聚合物的复合材料为制备具有增强性能的新型肥料提供了机会，以满足实际应用的需要。鸡羽毛蛋白接枝-聚丙烯酸钾-聚乙烯醇半互穿网络形成了一种具有高吸水性的树脂，结合氮（N）和磷（P）（CFP-g-PKA/PVA/NP 半互穿网络 SAR）。在灌溉下，化学结合或物理嵌入肥料的化合物可以从树脂基质中释放到周围的土壤中。研究了合成复合材料的合成机制、形态、化学和机械结构。通过响应面法（RSM）优化了反应物剂量。将制备的 SAR 进行了 30 天的田间试验，以检测样品粒径、土壤盐分、pH 值和含水量对 N 和 P 缓释行为的影响。复合材料中 N 和 P 的最大释放值分别为 69.46% N 和 65.23% P。进行了 120 天的土壤掩埋实验和 30 天的黑曲霉（A. niger）接种实验，监测了生物降解性和微观结构的变化。SAR 的添加还可以提高土壤的保水能力。
