期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2018
卷号：9
期号：6
页码：1838-1850
DOI：10.26872/jmes.2018.9.6.204
出版社：University of Mohammed Premier Oujda
摘要：Uniform nanoparticles of Mn-Fe oxide (MF) were prepared by the coprecipitationprocess under optimum experimental conditions. These particles acquired magnetism(MFmag) by the controlled heat treatment at 900 oC, which are then characterized by x-raydiffractometry (XRD), scanning electron microscopy (SEM), and energy-dispersivespectroscopy (EDS) for their structural, morphological, and elemental analysis,respectively. The same particles were functionalized with polyvinyl alcohol (PVA) andused as adsorbent for the removal of a model dye “Methylene Blue (MB)” from aqueoussolutions. Effect of pH, concentration of dye & adsorbent, temperature, contact time ofthe adsorbent with the adsorbate dye molecules was evaluated on the adsorption process.The experimental data were analyzed by the Langmuir, Freundlich and Temkin modelsof adsorption, among them Langmuir model was found best fit to equilibrium data. Theadsorption kinetics was found to follow the pseudo-second-order kinetic model.Thermodynamics parameters, ΔG°, ΔH° and ΔS°, indicated that the adsorption of MBonto PVA-functionalized MFmag was spontaneous, exothermic and physical in nature. Itwas noted that the adsorption process understudy is very effective, since in most of thecases the adsorbate solutions became colourless and up to 99% dye was removed underoptimum conditions. Similarly, in all cases, the adsorbents were easily separated from theadsorption mixtures by a permanent magnet. With the advantages of effective adsorptionof dye and magnetic separation, the PVA-functionalized MF nanoparticles could prove tobe a promising adsorbent in the wastewater treatment processes.
关键词：Magnetic oxide; Magnetic separation; Adsorption; Uniform particles; Coprecipitation; PVA functionalization
