Published on April 2020 | Nanotechnology
In the present study, economically scalable and energy efficient colloidal silver (Ag) nano-particles were bio-synthesized from marine red seaweed Halymenia porphyroides Boergesen (crypton) collected from southeast coast of Tamilnadu, India. The silver nano-particles were bio-synthesized as per green synthesis protocol. The rich presence of phytochemicals, bio-active compounds and secondary metabolites in marine macroscopic red seaweed Halymenia porphyroides Boergesen (crypton) play a major role since they possess reducing and capping agents for the biosynthesis of silver nano-particles that may be environmentally acceptable and eco-friendly. Therefore, the red seaweed Halymenia porphyroides Boergesen was used in the experimental study for the biosynthesis of silver nano-particle. The bio-synthesized silver nanoparticles from marine macroscopic red seaweed Halymenia porphyroides Boergesen were characterized by UV-vis spectroscopy which confirmed the surface plasmon resonance of silver nanoparticles, Fourier transform infrared (FT-IR) spectroscopy to identify the presence of various functional groups in biomolecules responsible for the bio reduction of Ag+ and capping/stabilization of silver nano-particles. X-ray diffraction (XRD) to observe face center cubic (fcc) and crystalline nature of silver nano-particles, thermo gravimetic analysis (TGA) which revealed the thermal stability and purity of the silver nano-particles. Particle size distribution and morphology were investigated by scanning electron microscope (SEM) which showed silver nano-particles in the size range of 34.3-80.5 nm. The particle distribution under different nanometers was analyzed using transmission electron microscopy (TEM).