Abstract
In this study, the ZnFe2O4@SiO2@Tragacanth gum magnetic nanocomposite as a novel adsorbent was synthesized and was confirmed by FTIR, XRD, TEM, TGA and VSM methods. Then, the prepared nanocomposite has been tested for the removal of methylene blue dye from aqueous solution for adsorption process, and the effect of various parameters including pH (2–12), adsorbent dosage (0.2–2 g/L), temperature (15–45 °C), initial dye concentration (10–60 mg/L) and contact time (5–120 min), also its isotherms and kinetics has been studied. The results showed that the optimum pH, contact time, initial dye concentration, adsorbent dosage and maximum adsorption capacity were 8, 60 min, 60 mg/L, 0.2 g/L and 109.37 mg/g, respectively. Furthermore, the experimental data determined that the adsorption of methylene blue dye interpreted the Freundlich isotherm (R2 = 0.979) and the pseudo-second-order kinetics model (R2 = 0.998). Also, the thermodynamic parameters of the absorption system, such as changes in enthalpy (ΔH = + 9.36 kJ/mol), entropy (ΔS = + 40.72 J/mol k) and Gibbs free energy (ΔG = − 3.5 kJ/mol), were measured and showed that adsorption process of ZnFe2O4@SiO2@Tragacanth gum magnetic nanocomposite was endothermic and spontaneous process. As a result, due to high adsorption capacity, environment friendly, low cost, rapid extraction and non-toxicity, the ZnFe2O4@SiO2@TG magnetic nanocomposite can be used as an effective adsorbent for methylene blue removal from aqueous solutions.
Highlights
In recent years, industrial development has led to an ever-increasing rise in industrial wastewater and environmental pollution [1]
Zinc nitrate (Zn (NO3)2 6H2O), iron nitrate (Fe (NO3)3 9H2O), ethylene diamine (ED), sodium hydroxide (NaOH), ammonia solution 25%, tetraethyl orthosilicate (TEOS), ethanol (EtOH), potassium persulfate (K2S2O8), methyl methacrylate (MMA), ascorbic acid (AA), acetone and methylene blue colored powder were purchased from Merck company and used without purification
Stock solution of Methylene blue (MB) dye was given by dissolving a certain amount of MB in distilled water. ZnFe2O4@SiO2@ Tragacanth gum (TG) magnetic N CS was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction device (XRD), Transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and vibration test sample magnetometer (VSM) patterns
Summary
Industrial development has led to an ever-increasing rise in industrial wastewater and environmental pollution [1]. The discharge of dyed wastewater into the environment, in addition to messing up the beautiful face of nature, disrupts the function of photosynthesis and extirpates the aquatic plants and animals [1]. They may be carcinogenic or mutagenic [4]. Nausea, diarrhea and vomiting are side effects of contact with containing MB sewage [7] Many techniques, such as coagulation and filtration, ion exchange, filter membranes, adsorption, advanced oxidation and photocatalytic processes, have been widely used for dyes removal. Many studies have been carried out on the absorption of methylene blue by various adsorbents that can be cited in studies by authors Andreas, Fan, Alehyen Omidi Khaniabadi and Altıntıg such as orange peel [17], tea waste [18], fly ash-based geopolymer [19], aloe vera wastes [5] and magnetic loaded activated carbon adsorbers [6] in 2016–2018
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