College of Landscape Architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803, United States.
School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803, United States.
Int J Biol Macromol. 2021 Mar 1;172:330-340. doi: 10.1016/j.ijbiomac.2021.01.063. Epub 2021 Jan 13.
Novel nanocomposite hydrogels were successfully prepared by blending and crosslinking sodium alginate (SA), poly(vinyl alcohol) (PVA) and cellulose nanofibers (CNFs) in the presence of a fertilizer formulation containing nitrogen (N), phosphorus (P) and potassium (K). The hydrogels had a macroporous flexible core and a microporous semi- interpenetrating polymer network (IPN) shell. The crystalline nature of the NPK chemicals was retained in the hydrogel nanocomposite network. Furthermore, the SA/CNF/PVA-based hydrogels showed a higher water-retention capacity in both deionized water and mixed soil. The swelling behavior in various physiological pH, salt and alkali solutions exhibited good sensitivity. The NPK release from SA/CNF/NPK and SA/CNF/PVA/NPK hydrogels was controlled by Fickian diffusion in both water and soil based on the Korsmeyer-Peppas release kinetics model (n < 0.5). Therefore, the prepared hydrogels have the potential for applications in drought-prone and/or fertilizer-loss regions for future development of precision agriculture and horticulture.
新型纳米复合水凝胶通过在含有氮（N）、磷（P）和钾（K）的肥料配方存在下混合和交联海藻酸钠（SA）、聚乙烯醇（PVA）和纤维素纳米纤维（CNF）成功制备。水凝胶具有大孔柔性核心和微孔半互穿聚合物网络（IPN）壳。水凝胶纳米复合网络中保留了 NPK 化学品的结晶性质。此外，基于 SA/CNF/PVA 的水凝胶在去离子水和混合土壤中均表现出更高的保水能力。在各种生理 pH 值、盐和碱溶液中的溶胀行为表现出良好的敏感性。根据 Korsmeyer-Peppas 释放动力学模型（n<0.5），SA/CNF/NPK 和 SA/CNF/PVA/NPK 水凝胶中的 NPK 释放由水中和土壤中的 Fickian 扩散控制。因此，所制备的水凝胶有可能在未来发展精准农业和园艺的干旱和/或肥料损失地区得到应用。
