One-Step Room-Temperature Synthesis of Bimetallic Nanoscale Zero-Valent FeCo by Hydrazine Reduction: Effect of Metal Salts and Application in Contaminated Water Treatment

Abstract

The effect of initial salt composition on the formation of zero-valent bimetallic FeCo was investigated in this work. Pure crystalline zero-valent FeCo nanoparticles (NPs) were obtained using either chloride or nitrate salts of both metals. Smaller NPs can be obtained using nitrate salts. Comparing the features of the FeCo prepared at room temperature and the solvothermal method revealed that both materials are almost identical. However, the room-temperature method is simpler, quicker, and saves energy. Energy-dispersive X-ray (EDX) analysis of the FeCo NPs prepared using nitrate salts at room temperature demonstrated the absence of oxygen and the presence and uniform distribution of Fe and Co within the structure with the atomic ratio very close to the initially planned one. The particles were sphere-like with a mean particle size of 7 nm, saturation magnetization of 173.32 emu/g, and surface area of 30 m 2 /g. The removal of Cu 2+ and reactive blue 5 (RB5) by FeCo in a single-component system was conformed to the pseudo-first-order and pseudo-second-order models, respectively. The isotherm study confirmed the ability of FeCo for the simultaneous removal of Cu 2+ and RB5 with more selectivity toward Cu 2+ . The RB5 has a synergistic effect on Cu 2+ removal, while Cu 2+ has an antagonistic effect on RB5 removal.

A Comparative Study of Mechanism and Performance of Anionic and Cationic Dialdehyde Nanocelluloses for Dye Adsorption and Separation

“…In the textile industry, the selective removal ability of an adsorbent is highly desirable, as sometimes only certain dyes need to be recycled from the effluent. To date, most reported adsorbents that possess effective selective dye adsorption abilities are usually realized by introducing charges on the surface or within the framework of polymers, , metal–organic frameworks, and alloy adsorbents. However, the high production cost of these materials due to the need for special reagents or processing techniques (e.g., organic solvents, electrospinning, and freeze-drying) have limited their real-world applications.…”