Novel NiFe/Si/Au magnetic nanocatalyst: Biogenic synthesis, efficient and reusable catalyst with enhanced visible light photocatalytic degradation and antibacterial activity

Abstract

The aim of this paper is to biosynthesize NiFe2O4/SiO2/Au (NiFe/Si/Au) magnetic nanocatalyst using the sonochemical method. This is the first study to synthesize this compound using this method. To obtain optimum morphology and size of products, the synthesis was performed in the presence of polyvinylpyrrolidone, maltose, glucose, and fructose as capping agents and Crataegus pentagyna leaf extract and NaBH4 as reducing agents. Vibrating‐sample magnetometer, field‐emission scanning electron microscopy, Fourier‐transform infrared, transmission electron microscopy, X‐ray diffraction, energy‐dispersive X‐ray spectroscopy, and differential reflectance spectroscopy techniques were performed to confirm the preparation of magnetic products. The as‐synthesized magnetic samples were used to enhance the photocatalytic degradation and antibacterial activity. The NiFe/Si/Au nanocatalysts exhibited an excellent photocatalytic activity by degradation of rhodamine b, methylene blue, and erythrosine as organic contaminants under ultraviolet and visible light irradiation. The degradation curves illustrate that the degradation of anionic dyes is more than that of cationic dyes. In addition, antibacterial activity of as‐prepared nanocatalyst against seven bacterial species was investigated. Because of their antibacterial effects, as‐synthesized products show a high antibacterial activity against various bacteria. Consequently, the NiFe/Si/Au nanocatalysts with high antibacterial activity and excellent potential photocatalyst activity can be used in environmental and medical sciences for wastewater treatment.

BiOCl with a favorable surface state regulated by polyhydroxylated disaccharides for dramatically accelerated photodegradation capacity

“…16 On the other hand, the disaccharides, acting as capping agents, can regulate the morphology of the catalysts. [17][18][19] Since the disaccharides are carbohydrates with multiple hydroxyl groups in their molecular structure, they are able to provide a greater spatial site resistance in the formation of BiOCl. 20 As an example, Mohammadi-Aghdam et al…”

“…16 On the other hand, the disaccharides, acting as capping agents, can regulate the morphology of the catalysts. 17–19 Since the disaccharides are carbohydrates with multiple hydroxyl groups in their molecular structure, they are able to provide a greater spatial site resistance in the formation of BiOCl. 20 As an example, Mohammadi-Aghdam et al synthesized Pr 3+ doped CaWO 4 nanostructures by sonication-assisted precipitation in the presence of a variety of capping agents such as glucose, maltose, fructose and lactose, and revealed that the photocatalytic activity of the nanostructures with maltose as the capping agent was considerably outperformed by other capping agents for dye degradation.…”

Biosynthesis of MnFe2O4@TiO2 magnetic nanocomposite using oleaster tree bark for efficient photocatalytic degradation of humic acid in aqueous solutions

“…Photocatalysts are materials which a pair of electron-holes are created by arti cial light or sunlight on their surface so that the free radicals resulting from this action have the oxidizing properties of the material. In fact, photocatalysts only provide the conditions for reactions (16,17). nowday, the use of magnetic nanocatalysts in various elds of research has developed because nanocatalysts can be recycled (18,19).…”

“…nowday, the use of magnetic nanocatalysts in various elds of research has developed because nanocatalysts can be recycled (18,19). Nanoparticles with a diameter between 1 and 100 nm have special properties such as regular morphology (17). Nanoparticles are very important because of their very small size and large ratio of surface to volume, which cause to physical and chemical differences in their properties (20).…”

Preparation of novel hybrid nanomaterials based on LaFeO3 and phosphotungstic acid as a highly efficient magnetic photocatalyst for the degradation of methylene blue dye solution

“…[ 4 ] Some of applied strategies for remediation of organic pollutants in wastewater are coagulation, reverse osmosis, ion exchange, sedimentation, filtration, adsorption, chemical oxidation, biodegradation, photodegradation, and ozonation methods. [ 4–8 ] Usage of chemical treatment, especially advanced oxidation processes (AOPs) has been considered for effective removal of the bio‐refractory compounds. AOPs process produces hydroxyl radical to non‐selectively degradation of organic pollutants.…”