Preparation and Characterization of Magadiite–Magnetite Nanocomposite with Its Sorption Performance Analyses on Removal of Methylene Blue from Aqueous Solutions

Abstract

The magadiite–magnetite (MAG–Fe3O4) nanocomposite has great potential applications in the field of biomaterials research. It has been used as a novel magnetic sorbent, prepared by co-precipitation method. It has the dual advantage of having the magnetism of Fe3O4 and the high adsorption capacity of pure magadiite (MAG). MAG–Fe3O4 was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The results showed that Fe3O4 nanoparticles were deposited on the interlayer and surface of magadiite. MAG–Fe3O4 was treated as an adsorbent for methylene blue (MB) removal from aqueous solutions. The adsorption properties of MAG–Fe3O4 were investigated on methylene blue; however, the results showed that the adsorption performance of MAG–Fe3O4 improved remarkably compared with MA and Fe3O4. The adsorption capacity of MAG–Fe3O4 and the removal ratio of methylene blue were 93.7 mg/g and 96.2%, respectively (at 25 °C for 60 min, pH = 7, methylene blue solution of 100 mg/L, and the adsorbent dosage 1 g/L). In this research, the adsorption experimental data were fitted and well described using a pseudo-second-order kinetic model and a Langmuir adsorption isotherm model. The research results further showed that the adsorption performance of MAG–Fe3O4 was better than that of MAG and Fe3O4. Moreover, the adsorption behavior of MB on MAG–Fe3O4 was investigated to fit well in the pseudo-second-order kinetic model with the adsorption kinetics. The authors also concluded that the isothermal adsorption was followed by the Langmuir adsorption isotherm model; however, it was found that the adsorption of the MAG–Fe3O4 nanocomposite was a monolayer adsorption.

Pollutant Absorption as a Possible End-Of-Life Solution for Polyphenolic Polymers

“…A recent study presented interesting organic hydrogels and inorganic nanocomposites for the removal of methylene blue dyes with very high adsorptions [10,11,12]. Anionic surfactants are generally removed from wastewater by using anaerobic bacteria [13,14], though cationic polymers have recently also been applied as absorbents [15].…”

Adsorption Process and Properties Analyses of a Pure Magadiite and a Modified Magadiite on Rhodamine-B from an Aqueous Solution

“…In order to investigate the adsorption rate, we research the dynamic boundary models, such as the film diffusion model, particle diffusion model, and chemical reaction model. We defined q t /q eq as F, where q t was the adsorption capacity at time t (mg•g −1 ), and q eq was the adsorption capacity when the adsorption reached equilibrium (mg•g −1 ), in the three equations that follow [38,39].…”

Removal of methylene blue dye in water by using recoverable natural zeolite/Fe3O4 adsorbent

“…Recently, such problem has been solved by using separable adsorbents prepared by coating the adsorbent with magnetic material such as magnetite (Fe3O4). The magnetization of several adsorbents including activated carbon (Altıntıg et al, 2017), clay (Ge at al., 2019 ), and zeolites (Javanbakht et al, 2017;Khodadadi et al, 2017;Mohseni-Bandpi et al, 2016;Yuan et al, 2018) has been reported.…”