Efficient Catalytic Degradation of Selected Toxic Dyes by Green Biosynthesized Silver Nanoparticles Using Aqueous Leaf Extract of Cestrum nocturnum L.

Abstract

In the present study, the catalytic degradation of selected toxic dyes (methylene blue, 4-nitrophenol, 4-nitroaniline, and congo red) using biosynthesized green silver nanoparticles (AgNPs) of Cestrum nocturnum L. was successfully performed. These AgNPs are efficiently synthesized when a reaction mixture containing 5 mL of aqueous extract (3%) and 100 mL of silver nitrate (1 mM) is exposed under sunlight for 5 min. The synthesis of AgNPs was confirmed based on the change in the color of the reaction mixture from pale yellow to dark brown, with maximum absorbance at 455 nm. Obtained NPs were characterized by different techniques, i.e., FTIR, XRD, HR-TEM, HR-SEM, SAED, XRD, EDX, AFM, and DLS. Green synthesized AgNPs were nearly mono-dispersed, smooth, spherical, and crystalline in nature. The average size of the maximum number of AgNPs was 77.28 ± 2.801 nm. The reduction of dyes using a good reducing agent (NaBH4) was tested. A fast catalytic degradation of dyes took place within a short period of time when AgNPs were added in the reaction mixture in the presence of NaBH4. As a final recommendation, Cestrum nocturnum aqueous leaf extract-mediated AgNPs could be effectively implemented for environmental rehabilitation because of their exceptional performance. This can be utilized in the treatment of industrial wastewater through the breakdown of hazardous dyes.

Green Synthesis of Controlled Shape Silver Nanostructures and Their Peroxidase, Catalytic Degradation, and Antibacterial Activity

“…These observations reflect the role of nanoparticles as substrates due to their high specific surface area [ 77 , 78 ]. For silver nanoparticles, several studies have demonstrated enhanced catalytic behavior for dye degradation with NaBH 4 [ 79 , 80 , 81 , 82 ].…”

Exploring the efficiency of green synthesized silver nanoparticles as photocatalysts for organic dye degradation: unveiling key insights

“…The specific compounds from the plant extract act as reducing agents and facilitate the rapid and effective degradation of the dyes. This study highlights the promising potential of photoinduced AgNPs as efficient catalysts for dye degradation, offering new insights into their mechanism of action and potential applications in environmental remediation [55].…”

“…Efficient synthesis of AgNPs was achieved by exposing a reaction mixture containing 5 ml of 3% aqueous extract of Cestrum nocturnum leaf and 100 ml of 1 mM silver nitrate to sunlight for 5 min according to [55]. The confirmation of AgNPs synthesis was based on the observed change in the color of the reaction mixture, from pale yellow to dark brown, with the maximum absorbance recorded at 455 nm.…”

Enhanced catalytic reductive hydrogenation of an organic dye by Ag decorated graphitic carbon nitride modified MCM-41

“…In this scenario, metal nanoparticles play an important role in the decolorization of organic dyes and in the presence of reducing agent NaBH 4 can accelerate electron transfer during the reduction reactions. [17][18][19] In heterogeneous catalysis processes, control of nanoparticle morphology contributes a major role in catalytic efficiency. A number of nanoparticles (Au, Ag, Cu, Fe etc.)…”