Highly facile removal of Acid Red 88 from aqueous samples by using synthesized iron oxide magnetic nanoparticles and 1-butyl-3- methylimidazolium tetrachloroferrate magnetic ionic liquid

Abstract

a b s t r ac tIn this study, the application of synthesized Fe 3 O 4 magnetic nanoparticles and 1-butyl-3-methylimidazolium tetrachloroferrate (bmim [FeCl 4 ]), as a magnetic ionic liquid, for removal of Acid Red 88 (AR88) from aqueous solution was investigated. At first, Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized via a chemical co-precipitation method with drop-wise addition of sodium hydroxide to an ideal mole ratio mixture of Fe 2+ and Fe 3+ solutions (Fe 2+ /Fe 3+ ), about 0.5, as well as under argon gas protection. X-ray diffraction and transmission electron microscopy were used to characterize the synthesized nanoparticles. The effect of important experimental parameters on the removal of Acid Red 88 such as pH of solution, contact time, temperature, ionic liquid and sorbent dosages was investigated. Also, Langmuir and Freundlich isotherm models were used for evaluation of the equilibrium adsorption. Acid dye adsorption equilibrium data were fitted well to the Langmuir isotherm and the maximum monolayer capacity q max was calculated from it as 909.1 mg g -1 . Thermodynamic studies indicated that the adsorption process was exothermic and spontaneous, and the adsorption mechanism was physisorption. On the other hand, a rapid sorption dynamics and quantitative removal of dye (≈95%) were observed under optimal conditions: 50 mL of 50 ppm dye solution at pH 3, 5 mg of ionic liquid, 10 mg of magnetic nanoparticles (MNPs), 2 min contact time at 10°C. Finally, this method was used for the removal of AR88 from real water samples of Chalus River. The obtained results indicated that Fe 3 O 4 MNP and magnetic ionic liquid (bmim [FeCl 4 ]) could be used as an efficient sorbent material for very simple and fast removal of acid dyes from aqueous solutions.

Synthesis of SDS micelles-coated Fe3O4/SiO2 magnetic nanoparticles as an excellent adsorbent for facile removal and concentration of crystal violet from natural water samples

“…As seen in Fig. 3, the dark nano-Fe 3 O 4 cores have been surrounded by a gray shell of SDS micelle and SiO 2 coating, and also little agglomeration can be observed [13]. Moreover, from TEM report, the particles have an approximate spherical shape and an average size of 30-40 nm.…”

“…Therefore, monolayer adsorption of dye on the homogeneous surface of SDS micelle-coated Fe 3 O 4 /SiO 2 MNP has been considered. Since the constant 1/n is 0.174, proper physical adsorption of dye on the nanoadsorbent is concluded [13]. On the other hands, the results showed that the maximum capacity of the SDS micelle-coated Fe 3 O 4 / SiO 2 MNPs was 16.37 mg g −1 for the removal of crystal violet.…”

“…9, by increasing the initial concentration of crystal violet in the aqueous solution, the dye removal is diminished. This is mainly due to the finite capacity of nanoadsorbent [13].…”

“…Among these techniques, SPE procedures are considered superior to other procedures, because these techniques have many advantages over others, such as: low running cost, high speed, low solvent consumption, and higher enrichment factors [9]. The effectiveness of dyes removal in SPE procedures depends strongly on the nature of adsorbent being used, because the analytical sensitivity, affinity, capacity, and precision of the procedure can be usually estimated by the adsorbent action during separation process [10][11][12][13].…”

Removal of As(V) from aqueous solution using modified Fe 3 O 4 nanoparticles

“…The TEM morphologies of Fe 3 O 4 @surfactants magnetic nanoparticles are shown in figure 3 . Figure 3 shows that the nano-Fe 3 O 4 cores indicated by dark colour are surrounded by a micellar shell of surfactants, along with the presence of slight agglomeration [ 45 ]. The TEM images of Fe 3 O 4 modified by SDS, CTAB and zwitterionic surfactant show the presence of spherical-like shapes having an average diameter of less than 20 nm.…”