Abstract
Solar light induced photo catalysis by plasmonic nanoparticles such as Au and Ag is an important field in green chemistry. In this study an environmental benign method was investigated for the rapid synthesis of colloidal Ag and AuNPs using the extract of Hydrocotyle asiatica, as a reducing and stabilizing agent under sunlight irradiation. The nanoparticles were formed in few seconds and were characterized by UV–Vis., FT-IR, TEM, EDAX, XRD, DLS and Zetasizer. The nanoparticles were stable in aqueous solution for more than 6 months. TEM analysis established that the Ag and AuNPs were predominantly spherical with average size of 21 and 8 nm, respectively. The flavonoids and glycosides from the extract of H. asiatica were proved to be responsible for the reduction and capping through FT-IR analysis. The antimicrobial studies of AgNPs showed effective inhibitory activity against the clinical strains of gram-negative and positive bacteria. The localized surface plasmon resonance of AgNPs was used for the photo-driven degradation of cationic dyes (malachite green and methylene blue). Thus, this green technique can be used for bulk production of AgNPs, and thus prepared nanoparticles may be used for removal of dyes from effluent.
Highlights
The essential of nanotechnology is to synthesize dispersed nanoparticles for potential applications in optics, biomedical sciences, drug delivery, catalysis and electronics
The nanoparticles were formed in few seconds and were characterized by Ultraviolet–Visible spectroscopy (UV–Vis)., FT-IR, Transmission Electron Microscopy (TEM), EDAX, X-ray Diffraction (XRD), Dynamic Light Scattering (DLS) and Zetasizer
AgNPs is monitored using UV–Vis spectrophotometer in the range of 200–800 nm, where an intense peak was obtained at 436 nm, which is known as Localized Surface Plasmon Resonance (LSPR) band due to the excitation of free electrons in the nanoparticles
Summary
The essential of nanotechnology is to synthesize dispersed nanoparticles for potential applications in optics, biomedical sciences, drug delivery, catalysis and electronics. Number of methods such as chemical [1,2,3,4], photochemical [5,6,7,8] and thermal [9, 10] have been developed to synthesize metallic nanoparticles. An efficient method for fabrication of metallic nanoparticles from metallomicelles is reported [11]. Among these methods, photochemical method has gained considerable attention due to its convenience, but it employs toxic chemicals as reducing and stabilizing agent [12]. To avoid the utilization of highly toxic chemicals, the use of microorganisms and plant parts for nanoparticles synthesis has been explored [13]. Previous reports mention the use of microorganisms such as Alternaria alternate [14], and Amylomyces rouxii [15] for the synthesis of nanoparticles
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
