Fabrication of Copper(II)-Coated Magnetic Core-Shell Nanoparticles Fe3O4@SiO2: An Effective and Recoverable Catalyst for Reduction/Degradation of Environmental Pollutants

Abstract

In this work, we report the synthesis of a magnetically recoverable catalyst through immobilizing copper (II) over the Fe3O4@SiO2 nanoparticles (NPs) surface [Fe3O4@SiO2-L–Cu(II)] (L = pyridine-4-carbaldehyde thiosemicarbazide). Accordingly, synthesized catalysts were determined and characterized by energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), field emission scanning electron microscopy (FESEM), and thermogravimetric-differential thermal analysis (TG-DTA) procedures. The [Fe3O4@SiO2-L–Cu(II)] was used for the reduction of Cr(VI), 4-nitrophenol (4-NP) and organic dyes such as Congo Red (CR) and methylene blue (MB) in aqueous media. Catalytic performance studies showed that the [Fe3O4@SiO2–L–Cu(II)] has excellent activity toward reduction reactions under mild conditions. Remarkable attributes of this method are high efficiency, removal of a homogeneous catalyst, easy recovery from the reaction mixture, and uncomplicated route. The amount of activity in this catalytic system was almost constant after several stages of recovery and reuse. The results show that the catalyst was easily separated and retained 83% of its efficiency after five cycles without considerable loss of activity and stability.

Copper Schiff base complex immobilized on magnetic graphene oxide: Efficient heterogeneous nanocatalyst for treating environmental pollutants and synthesis of chromenes

“…In the following, to optimize the nanocatalyst quantity, the model reaction was investigated using different amounts of GO/Fe 3 O 4 /CuL nanocomposites. The best result was obtained with 0.01 g of GO/Fe 3 O 4 /CuL, and more amounts of the nanocatalyst have no significant effect on the product yield and reaction time (Table 1, entries [13][14][15][16][17]. Finally, the model reaction was performed at various temperatures of 50 C, 60 C, 70 C, 80 C, 90 C, and 110 C, as well as room temperature.…”

“…The immobilization of metal complexes onto GO offers suitable catalytic performance especially in the environmental pollutants treatment, without significant leaching of the active sites during the reaction. [12][13][14][15][16][17] Organic dyes and nitroarene compounds, as stable chemical pollutants, are of the considerable sources of industrial wastewater pollution. [18,19] 4-Nitrophenol (4-NP) being highly toxic and hazardous to the environment and human health is often present in wastewater of various industries including dye, medicines, paper, and insecticide.…”

“…The immobilization of metal complexes onto GO offers suitable catalytic performance especially in the environmental pollutants treatment, without significant leaching of the active sites during the reaction. [ 12–17 ]…”

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

“…Adsorption, among the techniques, is the most powerful, economical, and efficient technique utilized to decontaminate dyes from wastewater at low concentrations due to its simplicity, low cost, and not requiring advanced technology [ 10 , 11 , 12 , 13 ]. During this year, novel adsorbent materials have been reported to remove toxic dyes such as methylene blue from wastewater [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Activated carbon (AC) is one of the most traditional, effective, and extensively utilized adsorbents in adsorption technologies, and it is among the cheapest sorbents in market.…”

Lead(II)-Azido Metal–Organic Coordination Polymers: Synthesis, Structure and Application in PbO Nanomaterials Preparation

“…Researchers have shown great attention to polymers having porous structures, named porous coordination polymers (PCPs) or metal-organic frameworks (MOFs). They can obtain different architectures [9,10] because of their inherent porosity, sizeable inner surface area, and the ability to tune pore topologies and sizes [11][12][13][14][15], converting these materials into potentially suitable materials for gas storage and adsorption [16][17][18][19], drug delivery [20][21][22], liquid and gas separation [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41], sensor technology [42,43] heterogeneous catalysis [44][45][46][47][48][49][50][51][52][53], hosting nanoparticles or metal colloids [54] o...…”