Radiation synthesis of Fe₃O₄/SiO₂/glycidyl methacrylate/acrylonitrile nanocomposite for adsorption of basic violet 7 dye: Kinetic, isotherm, and thermodynamic study

Abstract

New functional nanocomposites (Fe3O4/SiO2/GMA/AN) were synthesized by γ‐irradiation copolymerization of glycidyl methacrylate (GMA) and acrylonitrile (AN) of different ratios onto the surface of Fe3O4/SiO2 nanoparticles. The chemical structure and morphology of the nanocomposites were characterized by Fourier transform infrared (FTIR), X‐ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The influences of GMA/AN composition ratios (75/25, 50/50, and 25/75 v/v) of nanocomposites on the adsorption of basic violet 7 dye from aqueous solutions was investigated. The Fe3O4/SiO2/GMA/AN nanocomposite with GMA/AN compositions ratio of (25/75 v/v) provides maximum adsorption capacity, and thus it was selected as the suitable ratio for modification by amidoximation reaction. The influences of contact time, pH, temperature, initial concentration, and adsorbent dosage on the adsorption of dye onto Fe3O4/SiO2/GMA/AN‐amidoxime were evaluated. The adsorption capacity of poly (GMA/AN), Fe3O4/SiO2/GMA/AN, and Fe3O4/SiO2/GMA/AN‐amidoxime was 18.7, 114.1, and 181.3 mg/g, respectively. The optimum removal efficiency (90.65%) of dye by Fe3O4/SiO2/GMA/AN‐amidoxime was obtained after 120 min contact time, 200 mg/L dye concentration, and pH 7. The adsorption of dye onto the Fe3O4/SiO2/GMA/AN‐amidoxime follows pseudo‐second‐order adsorption kinetics and fits Langmuir adsorption isotherm, and the adsorption process is endothermic and spontaneous. The prepared Fe3O4/SiO2/GMA/AN‐amidoxime confirmed their possible use as a successful adsorbent for the adsorption of basic violet 7 from wastewater.

Targeted elimination of molybdenum ions from a leaching solution with the ability of radiated grafting GMA-PAN nanofibers

“… is the initial metal ion concentration ( ), if is zero, the isotherm is irreversible, if it is unfavorable ( , it is linear if , it is favorable ( 1). The values in this study range from 0.003–0.348 (0 1), as shown in Table 6 , which supports the successful adsorption of Mo(VI) onto the adsorbent 67 .…”

“…The point of zero charge ( ) explains the situation where there is no electrical charge accumulation on the surface (zero charge) and explains the adsorption process related to the adsorbate surface charge. At lower pH (acidic medium), the surface of the nanofiber (below ) is positively charged and attracts negatively-charged molecules, which increases the adsorption of molybdenum and at higher pH (above ) the surface of the nanofiber is negatively charged and attracts positively charged molecules in solution, which decreases the adsorption of molybdenum 67 , 75 and the of the adsorbent was measured using the pH drift method and was found to be 8.2 as shown in Fig. 5 .…”

“…Mo(VI) concentration was determined throughout a range of time intervals. Pseudo-first-order, pseudo-second-order, and Weber–Morris kinetic models were used to examine the data 67 .…”

l-Asparagine–EDTA–amide silica-coated MNPs: a highly efficient and nano-ordered multifunctional core–shell organocatalyst for green synthesis of 3,4-dihydropyrimidin-2(1H)-one compounds

“…30,31 In fact, they are coated with a protective layer such as carbon layers, 32,33 organic polymers 34 or silica. 35–37…”

Development of Cotton Fabrics via EVA/SiO2/Al2O3 Nanocomposite Prepared by γ-Irradiation for Waterproof and Fire Retardant Applications

“…Recently, metal oxide nanoparticles embedded within the polymer matrix, metal oxide-based polymeric nanocomposites, have attracted the growing interest in nanostructured materials due to the unique properties and combine the properties of the polymer as well as the metal oxide. Different types of metal oxide-based polymeric nanocomposites could be synthesized by different polymerization methods including suspension polymerization [9], emulsion polymerization [10], and γ-irradiation polymerization [11][12][13][14][15]. The properties of the produced nanocomposites depend on numerous aspects such as the morphological structure, the procedure of preparation, the nature of metal oxide nanoparticles that incorporated in, the structural features of the polymer used, and the chemical properties of both metal oxide and polymer molecules.…”