Efficient removal of Eriochrome black-T from aqueous solution using NiFe2O4 magnetic nanoparticles

Abstract

The magnetic NiFe2O4 nanoparticles have been synthesized and used as adsorbents for removal of an azo dye, Eriochrome black-T (EBT) from aqueous solution. The NiFe2O4 nanoparticles were characterized by scanning electron microscope (SEM), Transmission electron microscope (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR). The adsorption studies were carried out under various parameters, such as pH, adsorbent dosage, contact time and initial dye concentration. The experimental results show that the percentage of adsorption increases with an increase in the adsorbent dosage. The maximum adsorption occurred at the pH value of 6.0. The equilibrium uptake was increased with an increase in the initial dye concentration in solution. Adsorption kinetic data were properly fitted with the pseudo-second-order kinetic model. The experimental isotherms data were analyzed using Langmuir and Freundlich isotherm equations. The best fit was obtained by the Langmuir model with high correlation coefficients (R2 = 0.9733) with a maximum monolayer adsorption capacity of 47.0 m g/g.

Facile Synthesis of Silver Nanoparticles Decorated Magnetic-Chitosan Microsphere for Efficient Removal of Dyes and Microbial Contaminants

“…Under similar condition, activated carbon adsorbed 87.2 ± 5.6 mg/g mixed dye. The adsorption capacity of MCSM was also found to be much higher in comparison to other adsorbents, as reported in the literatures (Supporting Information 62 and cadmium hydroxide nanowire loaded on activated carbon adsorbed 108.7 mg/g of bromocresol green. 63 In spite of that, these adsorption studies were carried out in single dye system; while, in the present study MCSM removed dyes from multi-component system and adsorbed 271.2 ± 14.5 mg/g of mixed dyes.…”

Magnetic nickel ferrite nanoparticles as an efficient catalyst for the preparation of polyhydroquinoline derivatives under microwave irradiation in solvent-free conditions

“…Magnetic nickel ferrite nanoparticles were synthesized by the auto-combustion assisted sol-gel method [43,44]. The structural properties of the NiFe 2 O 4 MNPs were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma (ICP), and IR.…”

“…Nickel ferrite MNPs are inexpensive, air-stable, magnetically separable, and economical catalysts [41][42][43][44]. There are very limited and there are less references about catalytic properties of nickel ferrite MNPs [45][46][47].…”

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“…[1][2][3]. Most of these organic dyes are mutagenic, carcinogenic and toxic [4,5]. Therefore, discharging of such dyestuffs into water systems is considered as the most worldwide environmental problem [6].…”

“…Up to now, different techniques including membrane filtration, coagulation-flocculation, photocatalytic degradation, chemical oxidation and adsorption, etc. [2][3][4][5][6][7][8] have been developed for removing very toxic organic dyes from aqueous solutions. Among these methods, adsorption is superior owing to its unique properties including ease of operation, low operational cost, simplicity of design, insensitivity to toxic pollutants, high removal efficiency and availability of various adsorbent types, etc.…”