Abstract
ABSTRACTThis paper describes a green one-pot synthesis of L-Serine (L-Ser) capped magnetite nanoparticles (Fe3O4 NPs) and its potential application for adsorption of RhB dye from aqueous solution. The surface property, structure, morphology and magnetic properties of as prepared L-Ser capped Fe3O4 NPs were characterised through UV-Visible spectroscopy, Fourier transform-infrared spectroscopy, X-Ray Diffraction (XRD), scanning electron microscope, transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). The XRD results were indicated the formation of high crystalline spinel type Fe3O4 NPs. TEM images were shown the spherical shape of L-Ser capped Fe3O4 NPs with particle size of 5.9 nm. The VSM curve showed the superparamagnetic behaviour of L-Ser capped Fe3O4. A plausible interaction mechanism of L-Ser and Fe3O4 NPs was also investigated. L-Ser capped Fe3O4 NPs due to its large surface area and a strong magnetism was shown potential adsorption efficiency towards RhB dye from aqueous solution. The adsorption isotherm data fitted well with Langmuir isotherm model and the monolayer adsorption capacity (qe,exp) was found to be 6.82 mg/g at pH 7.4 and 300 K. The experimental kinetic data fitted very well with the pseudo-second-order model. The thermodynamic studies reveal that adsorption efficiency is critically dependent on temperature.
Highlights
In recent years, numerous industries have been troubling the water quality by release of various contaminants such as dyes, heavy metal ions and many other organic pollutants [1,2,3]
We report a facile green synthesis of L-Ser capped Fe3O4 NPs via a coprecipitation of Fe3C and Fe2C salts in the presence of L-Ser as a capping agent
The positive DS confirms the randomness of the system and it results an increase in the rate of diffusion of RhB molecules across the surface of the L-Ser capped Fe3O4 NPs rises, which leads to an increase in the adsorption efficiency [35]
Summary
Provides sludge-free output [4,5]. Activated carbon has been long known for an effective colour removal adsorbent, but its expensive operation cost unable to address for a wide range of consumers [6]. Many approaches have been studied for the development of lowcost and more effective adsorbents such as silica gel [7], perlite [8], lignite [9], fly ash [10], etc Most of these adsorbents due to their highly porous in nature provide sufficient surface area for adsorption. Fe3O4 NPs below their critical particle size (»20 nm) without surface capping could be aggregated during the course of chemical reaction [15]. This phenomenon hampers to exploit the effectiveness of Fe3O4 NPs for their potential application. The adsorption kinetics, thermodynamics and isotherms of RhB by using L-Ser capped Fe3O4 NPs were investigated
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