Green synthesis of Fe₃O₄@SiO₂‐Ag magnetic nanocatalyst using safflower extract and its application as recoverable catalyst for reduction of dye pollutants in water

Abstract

This paper reports the green and in situ preparation of Fe 3 O 4 @SiO 2 -Ag magnetic nanocatalyst synthesized using safflower (Carthamus tinctorius L.) flower extract without the addition of any stabilizers or surfactants. The catalytic performance of the resulting nanocatalyst was examined for the reduction of 4-nitrophenol (4-NP), methylene blue (MB) and methyl orange (MO) in an environment-friendly medium at room temperature. The main factors such as pH, temperature and amount of catalyst influencing the nanocatalyst performance were studied. The apparent rate constants for 4-NP, MO and MB reduction were calculated, being 0.756 min −1 , 0.064 s −1 and 0.09 s −1 , respectively. The catalyst was recovered using an external magnet and reused several times with negligible loss of catalytic activity. The as-synthesized nanoparticles were characterized using powder X-ray diffraction, transmission electron microscopy, UV-visible, Fourier transform infrared and inductively coupled plasma atomic emission spectroscopies, dynamic light scattering and vibrating sample magnetometry.

Green synthesis of Ag NPs on magnetic polyallylamine decorated g-C3N4 by Heracleum persicum extract: efficient catalyst for reduction of dyes

“…In addition, the peaks at 3200-3500 cm −1 were due to NH, and OH stretching vibration mode. It, therefore, confirmed the presence of Fe 3 O 4 and g-C 3 N 4 structures 34 . Figure 2b showed the FTIR spectrum of the Fe 3 O 4 -g-C 3 N 4 -polyallylamine nanostructure.…”

Fe3O4@SiO2‐PANI‐Au Nanocomposite Prepared for Electrochemical Determination of Quercetin in Food Samples and Biological Fluids

“…This solution was stirred for 30 min at 70 °C. Then 11 mL ammonia (28 %) was added to the above solution, this solution was stirred for 1 h at 70 °C, and the black product was isolated using an external magnet and washed with water several times and then dried. Synthesis of Fe 3 O 4 @SiO 2 core‐shell nanostructure: The Fe 3 O 4 @SiO 2 was synthesized by the Stober method . Fe 3 O 4 (1.0 g) was dispersed in 200 mL ethanol for 20 min, and 2.0 mL tetraethoxysilane, in 5 mL of NH 3 was added to it.…”

“…Synthesis of Fe 3 O 4 @SiO 2 core‐shell nanostructure: The Fe 3 O 4 @SiO 2 was synthesized by the Stober method . Fe 3 O 4 (1.0 g) was dispersed in 200 mL ethanol for 20 min, and 2.0 mL tetraethoxysilane, in 5 mL of NH 3 was added to it.…”

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

“…Many methods are used for treating organic contaminants in wastewater, including adsorption, photocatalytic, biological, chemical oxidation and ozonation methods . The degradation of these dye compounds into nonhazardous products is difficult because of their low solubility in water and their high stability . Photocatalytic technology is one of the easiest and cost‐effective methods to remove inorganic and organic contaminants from wastewater, and is regarded as a promising and environment‐friendly method of converting resistant organic pollutants into nontoxic species.…”