Surface Modification of Magnetite Using Silica Coating: Spectroscopic, Structural, Morphological Characterization and Interaction with Crystal Violet Dye
Source abstract
Abstract
The essential goal of this work is to produce an eco-friendly and economically nano-adsorbent that may separate organic dye, especially, cationic dye, from polluted water prior to making use of this adsorbent in industrial field. This work suggests a way of fabricating magnetite and silica. The proposed approach concerned three steps: the preparation of magnetite (Fe3O4) nanoparticles by co-precipitation method, then of silica using sodium silicate prepared from silica sand, and finally a magnetite coating of silica Fe3O4/SiO2. The nanocomposites were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The XRD characterization displayed that silica formed an amorphous phase and that magnetite shaped a spinel phase. To optimize the diverse experimental variables affecting the elimination performance of the CV, the effects of experimental parameters including solution pH, adsorbent dose, contact time, initial dye concentration and temperature were evaluated. Adsorption kinetic disclosed that pseudo-second-order is the best model (R2 > 0.99, qe = 5.68 mg g−1). Adsorption isotherm represented that Langmuir is the best model with Qmax = 200 mg g−1. The negative ΔH° and ΔG° values exhibited the exothermic and spontaneous nature of CV sorption on the nanoparticles, respectively.
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Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Iron oxide chemistry and applications · Nanomaterials for catalytic reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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