Hydrogel Nanocomposite Based Slow-Release Urea Fertilizer: Formulation, Structure, and Release Behavior

IF 5.4 1区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY GIANT Pub Date : 2024-04-27 DOI:10.1016/j.giant.2024.100270
Kezhu Lu , Ragab Abouzeid , Qinglin Wu , Qibing Chen , Shiliang Liu
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Abstract

To enhance the nitrogen utilization efficiency of fertilizers, we developed a novel slow-release fertilizer hydrogel through free radical polymerization, incorporating lignin-containing cellulose nanofiber (LCNF), clinoptilolite (CL), urea, and acrylic acid (AA)-co-acrylamide (AAm) polymer. Various analytical techniques were utilized to examine the structure, swelling, and release behaviors of the fabricated hydrogels with varying LCNF concentrations. The results indicated that the addition of 10% LCNF led to a decrease in water absorption from 72.44 g g−1 to 24.04 g g−1. However, re-swelling was significantly enhanced, with a reduction in re-swelling capacity loss from 32.91% to 23.52%. Concurrently, water retention capacity notably increased from 18.03% to 39.20%. The hydrogel containing 10% LCNF exhibited a slower urea release over 30 days. The kinetic studies revealed that the swelling and urea release behaviors align well with the second-order kinetics model and the Peppas-Sahlin model, respectively. In summary, the developed LCNF/CL/(AA-co-AAm)/urea hydrogel nanocomposites present a novel strategy for the future production and utilization of slow-release fertilizers in agricultural and horticultural fields.

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基于水凝胶纳米复合材料的缓释尿素肥料:配方、结构和释放行为
为了提高肥料的氮利用效率,我们通过自由基聚合技术,将含木质素的纤维素纳米纤维(LCNF)、clinoptilolite(CL)、尿素和丙烯酸(AA)-共丙烯酰胺(AAm)聚合物结合在一起,开发了一种新型缓释肥料水凝胶。利用各种分析技术检测了不同浓度 LCNF 制成的水凝胶的结构、溶胀和释放行为。结果表明,添加 10% LCNF 后,吸水率从 72.44 g g-1 降至 24.04 g g-1。不过,再膨胀能力明显增强,再膨胀能力损失从 32.91% 降至 23.52%。同时,保水能力从 18.03% 显著提高到 39.20%。含有 10% LCNF 的水凝胶在 30 天内的尿素释放速度较慢。动力学研究表明,溶胀和尿素释放行为分别符合二阶动力学模型和 Peppas-Sahlin 模型。总之,所开发的 LCNF/CL/(AA-co-AAm)/尿素水凝胶纳米复合材料为未来在农业和园艺领域生产和使用缓释肥料提供了一种新策略。
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来源期刊
GIANT
GIANT Multiple-
CiteScore
8.50
自引率
8.60%
发文量
46
审稿时长
42 days
期刊介绍: Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.
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