Stokes Laboratories, School of Engineering, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland.
Multiphase Reactors and Intensification Group, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland.
Int J Biol Macromol. 2024 Nov;281(Pt 1):136292. doi: 10.1016/j.ijbiomac.2024.136292. Epub 2024 Oct 3.
Conventional fertilizers face environmental and economic challenges due to their high solubility, leading to significant losses via runoff and leachate. This study presents a biodegradable hydrogel, synthesized from lignin and polyvinyl alcohol (PVA), designed as an eco-friendly carrier for struvite (fertilizer) with controlled phosphate release. The hydrogel was analysed through scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Thermogravimetric analysis (TGA) and Differential scanning calorimetry (DSC). Furthermore, the prepared hydrogels demonstrated high water absorption capacities (963.4 %, 706.4 %, and 410 % for LH, LH, and LH, respectively) and exhibited Fickian diffusion behaviour. Phosphate release studies showed a gradual release over 6-8 h with concentrations of 20.5 ppm, 19.45 ppm, and 17.85 ppm for St-LH, St-LH, and St-LH. These lignin-based hydrogels offer a promising, cost-effective solution for slow-release fertilizers with high efficiency.
由于传统肥料溶解度高，导致通过径流和淋溶损失大量肥料，因此面临环境和经济方面的挑战。本研究提出了一种由木质素和聚乙烯醇（PVA）合成的可生物降解水凝胶，旨在用作具有控制磷酸盐释放的鸟粪石（肥料）的环保载体。通过扫描电子显微镜（SEM）、X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、X 射线光电子能谱（XPS）、热重分析（TGA）和差示扫描量热法（DSC）对水凝胶进行了分析。此外，所制备的水凝胶表现出高的水吸收能力（LH、LH 和 LH 分别为 963.4%、706.4%和 410%），并表现出菲克扩散行为。磷酸盐释放研究表明，在 6-8 小时内以 20.5ppm、19.45ppm 和 17.85ppm 的浓度逐渐释放，St-LH、St-LH 和 St-LH 的浓度分别为 20.5ppm、19.45ppm 和 17.85ppm。这些基于木质素的水凝胶为高效的缓释肥料提供了一种有前途的、具有成本效益的解决方案。
