Search

Green technology is gaining importance nowadays, it has become very important to synthesize various nanoparticles. This review mainly focuses on the phytosynthesis of silver nanoparticles (AgNPs) and shows their catalytic applications in the field of wastewater treatment. Plant-assisted synthesis of AgNPs has been documented by numerous studies. Plant-mediated synthesis has many advantages over conventional methods and is discussed comprehensively in this review. This critical review aims to help researchers to better understand and follow this rapid, cost-effective, and eco-friendly research area. Dye effluents in water bodies become a major environmental issue worldwide. This paper also offers a thorough understanding of the synthetic dyes such as Rhodamine B, Methylene Blue, Crystal violet, Methyl Orange, and Amido black 10B used in the textile industry, with a focus on the popular methods to degrade them from industrial wastewater, especially, chemical degradation, and photocatalytic dye degradation using silver nanoparticles and other Ag-systems. Additionally, the plausible mechanism involved in chemical and photocatalytic degradation was also provided. There are several review articles on all these topics, but such an in-depth study has not been investigated so far in the concerned research literature. [ABSTRACT FROM AUTHOR]

Plant parts have unfathomable potential in the synthesis of nanoparticles. The current study was designed for the photosynthesis of silver nanoparticles (NC-AgNPs) using bark extract of N. cadamba. Different analytical methods were used to characterize the synthesized nanoparticles. HR-TEM analysis identifies the formation of multi-shaped NC-AgNPs like spherical, quasi-spherical, rod-shaped, trigonal, square, pentagonal, and hexagonal with a size range of 18-91 nm. The crystallize size of NC-AgNPs was found to be 27.6 nm. The catalytic effectiveness of NC-AgNPs in degrading Crystal violet (CV) dye is remarkable. Important parameters such as the effect of catalyst dose and pH were investigated. Dose-dependentantioxidant activity of NC-AgNPs was determined by using 2,2-Diphenyl-1-picrylhydrazyl (DPPH) assay. Low-cost synthesis and eco-friendly reagents were the salient features that made NC-AgNPs more attractive toward catalytic and antioxidant activities. N. cadamba bark was used the first time as a green source for the synthesis of silver nanoparticles. The synthesis of different shapes of nanoparticles in one-step synthesis. The study of NC-AgNPs for their catalytic and antioxidant activities is reported for the first time. [ABSTRACT FROM AUTHOR]

Plant extract mediated nanoparticles have gained enormous attention for their green and rational approach and developed as an alternative to conventional chemical and physical methods. Here, the less exploited Jatropha integerrima flower extract is used in the synthesis of silver nanoparticles. The as-prepared nanoparticles exhibit a strong surface plasma resonance around 420 nm. Several spectroscopic techniques confirmed the formation of silver nanoparticles with an average size of 32.07 nm, stabilized by functional groups. The catalytic activity of synthesized nanoparticles for Rhodamine B dye degradation in the presence of sodium borohydride was investigated. The results showed that the 100 µL catalyst dose degraded the alkaline solution of dye up to 98%, with a high rate constant of 1.2110 min−1. In addition, the nanoparticles were tested for antioxidant activity using the 2,2-dipehnyl-1-picrylhydrazyl free radical assay. The calculated IC50 value for synthesized nanoparticles was 33.63 ± 0.53 µg/mL. Thus, the as-prepared nanoparticles are excellent candidates for catalytic and antioxidant activities compared to other materials used so far. [ABSTRACT FROM AUTHOR]