Green synthesis of silver nanoparticles with antimicrobial and azo dye (Congo red) degradation properties using Amaranthus gangeticus Linn leaf extract

Abstract

Background: The present paper describes a less time-consuming and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using an aqueous solution of silver nitrate and Amaranthus gangeticus Linn (Chinese spinach) leaf extract. The synthesized AgNPs which are to be used as an antimicrobial and Congo red dye is to be used as a toxic-degrading agent. Methods: AgNP was prepared by the reduction of silver nitrate solution by the leaf extract of Amarranthus Gangeticus Linn leaf extract in aqueous medium on heating for about 15 mins at 80°C in presence of one drop 0.05 (M) NaOH. Results: The size of the synthesized silver nanoparticles (AgNPs) using Amaranthus gangeticus Linn leaf extract and aqueous solution of silver nitrate (10 −3 M) are formed at their stable condition within the range of 11-15 nm. AgNPs are obtained by this process within a couple of minutes of reaction without using reducing and stabilizing agents or harsh conditions. High-resolution transmission electron microscope (HR-TEM), selected area electron diffraction (SAED), ultraviolet-visible (UV-VIS) spectroscopy, and Fourier transform infrared spectroscopy (FTIR) are used to characterize the prepared AgNPs which show that the nanoparticles are globular in shape and polycrystalline. The synthesized silver nanoparticles showed inhibitory activity towards Gram positive, Gram negative bacteria and fungus and also showed good Congo red dye-degrading agents. Conclusions:The overall outcome of this study suggests that green synthesis AgNPs hold promise as a potent antibacterial and antifungal agent. The particles obtained were also found to degrade toxic Congo red dye.

Synthesis of ZnTiO3@TiO2 Heterostructure Nanomaterial as a Visible light Photocatalyst

“…The color of congo red in aqueous solution has been changed to almost clear marking at the end of the decolorization (see Figure (c)). So the prepared ZnTiO 3 @TiO 2 heterostructure nanomaterial might be suitable photocatalyst for the degradation of congo red . Moreover, Figure S4 (a) shows the contrast test of ZnTiO 3 @TiO 2, ZnTiO 3 and TiO 2 and Figure S5 (a) shows a different ratio of TiO 2 to ZnTiO 3 for the photocatalytic degradation of Congo red.…”

Photocatalytic Degradation of Congo Red Using PbTiO3 Nanorods Synthesized via a Sonochemical Approach

“…The % degradation of Congo red was monitored by UV‐VIS spectrophotometer and it shows the 92% degradation. The peak at 497 nm (π→π*) and peak at 343 nm (n→π*) electron transition in Congo red is related with an azo group . The pseudo‐first‐order reaction can be explained by the kinetics model by plotting ‐ln (C/C 0 ) against time t (see fig.…”

Green synthesis of silver nanoparticles using cauliflower waste and their multifaceted applications in photocatalytic degradation of methylene blue dye and Hg2+ biosensing

“…[1,[4][5][6][7][8]. In particular, silver nanoparticles (AgNPs) have received close attention due to their unique physicochemical properties [9][10][11][12].…”

“…Colloidal silver particles have been reported to act as effective antimicrobial agents against bacteria and viruses [11,[13][14][15]. They also possess promising catalytic activity, which enable them to degrade harmful synthetic dyes such as methylene blue (MB), congo red, methyl orange and methyl red [2,3,11,[16][17][18][19]. Additionally, they have also been shown to act as efficient sensors for detecting heavy metals like mercury and copper ions [20,21].…”

“…Several research studies have successfully synthesized AgNPs using extracts prepared from fresh plant material of Ocimum sanctum (Tulsi), olive leaf, Amaranthus gangeticus (Chinese red spinach), Citrullus lanatus, Datura stramonium, coffee, Azadirachta indica (neem), Matricaria recutita (Babunah), Aloe vera etc. [11,15,20,21,[25][26][27][28][29]. Alternatively, fruit and vegetable wastes have also been utilized for synthesizing AgNPs with the purpose of curbing their overwhelming burden on the environment [24,[30][31][32].…”