Photocatalytic degradation of organic dyes and antimicrobial activity of silver nanoparticles fast synthesized by flavonoids fraction of Psidium guajava L. leaves

• Published in: Journal of molecular liquids 2018-08, Vol.263, p.187-192
• Main Authors: Wang, Lu, Lu, Fangju, Liu, Yan, Wu, Yanan, Wu, Zhenqiang
• Format: Article
• Language: English
• Subjects: Antimicrobial activity; Flavonoids; Nanocomposites; Photocatalytic degradation; Psidium guajava L. leaves
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2018.04.151

A novel and ecofriendly procedure was developed for the synthesis of silver nanoparticles (FAgNPs) with the reduction of AgNO3. The flavonoids fractions (FF) of Psidium guajava leaves (PGL) were used as a green reducing and capping agent. Results showed that FF from PGL rapidly could synthesize into regular spheres and stable silver nanoparticles within 10 min. The average particle size of synthesized FAgNPs was 15–20 nm, with maximum absorbance wavelength at 420 nm. Moreover, FAgNPs exhibited a strong inhibition against the selected microorganisms, especially Alcaligenes faecalis, Escherichia coli and Aspergillus niger. Importantly, FAgNPs also possessed good catalytic degradation potency for organic dyes, namely, methyl orange and Coomassie brilliant blue G-250, under solar or UV irradiation. Overall, FAgNPs have good potential application prospects in the development of anti-bacterial materials and for the photocatalytic degradation of certain toxic dyes or chemicals, thereby paving the way for waste treatment and environmental bio-remediation. [Display omitted] •Silver nanoparticles (FAgNPs) were synthesized using flavonoids within 10 min.•The FAgNPs morphology is spherical and well-dispersed with a size range of 15–20 nm.•The FAgNPs verified the strong inhibition against A. faecalis and A. niger.•The FAgNPs showed good photocatalytic degradation capacity of organic dyes.