Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

Abstract

Plant-mediated nanoparticles are gaining popularity due to biologically active secondary metabolites that aid in green synthesis. This study describes a simple, environmentally friendly, dependable, and cost-effective production of silver nanoparticles utilizing Cucumis sativus and Aloe vera aqueous leaf extracts. The aqueous leaf extracts of Cucumis sativus and Aloe vera , which worked as a reducing and capping agent, were used to biosynthesize silver nanoparticles (AgNPs). The formation of surface plasmon resonance peaks at 403 and 405 nm corresponds to the formation of colloidal Ag nanoparticles. Similarly, the Bragg reflection peaks in X-ray diffraction patterns observed at 2θ values of 38.01°, 43.98°, 64.24°, and 77.12° representing the planes of [111], [200], [220], and [311] correspond to the face-centered cubic crystal structure of silver nanoparticles. Fourier transform infrared spectroscopy confirms that bioactive chemicals are responsible for the capping of biogenic silver nanoparticles. The size, structure, and morphology of AgNPs with diameters ranging from 8 to 15 nm were examined using transmission electron microscopy. Water contamination by azo dyes and nitrophenols is becoming a more significant threat every day. The catalytic breakdown of organic azo dye methyl orange (MO) and the conversion of para -nitrophenol (PNP) into para -aminophenol using sodium borohydride was evaluated using the prepared biogenic nanoparticles. Our nanoparticles showed excellent reduction ability against PNP and MO with rate constants of 1.51 × 10 –3 and 6.03 × 10 –4 s –1 , respectively. The antibacterial activity of the nanomaterials was also tested against four bacteria: Staphylococcus aureus , Klebsiella pneumoniae , Enterobacter , and Streptococcus pneumoniae . These biogenic AgNPs displayed effective catalytic and antibacterial characteristics by reducing MO and PNP and decreasing bacterial growth.

Green Synthesis of Flower-Like Carrageenan-Silver Nanoparticles and Elucidation of Its Physicochemical and Antibacterial Properties

“…The XRD pattern of the c-AgNPs in Figure 3 shows four distinct diffraction peaks at 2θ of 37.73°, 43.92°, 64.28°, and 77.40°. These peaks can be indexed to the (111), (200), (220), and (311) crystallographic planes in accordance with Bragg’s reflection of the face-centred cubic (fcc) structure of silver, as per the database of the Joint Committee on Powder Diffraction Standards (JCPDS; card number: 04-0783) [ 2 , 12 ]. The crystalline nature of the c-AgNPs is indicated by the intense peaks, with the peak at 2θ = 37.73° being the most intense, implying the preferred orientation along the (200) lattice plane.…”

“…The synthesis of AgNPs can be achieved via chemical and physical routes, but the hazardous effects of their by-products on the environment and the high manufacturing cost are major concerns [ 6 , 7 , 8 ]. Hence, various biomolecules, including yeast, bacteria, fungi, and algae, as well as plant extracts, have been explored for the green synthesis of AgNPs [ 3 , 9 , 10 , 11 , 12 , 13 ]. Plant-mediated syntheses are used more often than other biomolecules because of their easy accessibility, biocompatibility, cost effectiveness, and excellent stability under challenging experimental settings [ 3 , 4 , 12 ].…”

“…Hence, various biomolecules, including yeast, bacteria, fungi, and algae, as well as plant extracts, have been explored for the green synthesis of AgNPs [ 3 , 9 , 10 , 11 , 12 , 13 ]. Plant-mediated syntheses are used more often than other biomolecules because of their easy accessibility, biocompatibility, cost effectiveness, and excellent stability under challenging experimental settings [ 3 , 4 , 12 ]. The active compounds responsible for the reduction process, on the other hand, are uncertain, and the process is relatively complicated and time consuming.…”

Optical Properties of Composite Silver Nanoparticles

“…Silver has also been used in various industries and health fields. Silver is known to have antibacterial properties [4,6,16,19,20], as a catalyst [21], and it shows stability to the environment [22] and has been utilized as a significant component of water treatment.…”

Preparation and catalytic properties of polydopamine-modified polyacrylonitrile fibers functionalized with silver nanoparticles

“…Silver nanocatalysts have low price, antibacterial activity and very stable physical and chemical properties, so they are widely used in optics, 1,2 catalysis, 3–6 antibacterial 7,8 and other fields. 9,10 Many methods have been reported to synthesize silver nanomaterials, such as the gas condensation method, 11 localized surface plasmon resonance, 12 mechanical grinding, 13 irradiation 14 and the microwave method, 15 but these methods generally require harsh conditions, low pressure inert gas or specialized equipment.…”