Ecofriendly Synthesis of A Hybrid Hydrogel Incorporating Silver Nanoparticles: Biological and Photocatalytic Activities

We present the synthesis and characterization of a hybrid material comprising silver nanoparticles embedded within a 3D hydrogel network. The use of an aqueous extract of Acanthus mollis as a natural reducing agent facilitates the synthesis process. Acanthus mollis is a perennial, invasive and leafy plant that is widely distributed across the planet. Sequential introduction of silver nitrate solution and the plant extract into the hydrogel yielded a homogeneous dispersion of nanoparticles. The hybrid material, which contains an approximate weight percentage of 9 % silver, was characterized using various techniques, including scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, ultraviolet-visible spectroscopy, and thermogravimetric analysis. Remarkably, and in contrast to the initial hydrogel, the hybrid material was found to be stable at temperatures exceeding 100 °C. This material offers a practical means for preserving silver nanoparticles by preventing aggregation and oxidation thereof. Moreover, the nanoparticles can be safely transported after drying the hydrogel. The incorporation of silver within the hydrogel introduces synergistic effects and specific selectivity, thereby enhancing its applicability across various fields. The nanoparticles exhibit diverse properties, including antioxidant, antibacterial, antifungal, and antidiabetic effects. Additionally, they serve as efficient photocatalysts for dye degradation in aqueous solutions.