One-Step Carbothermal Synthesis of Super Nanoadsorbents for Rapid and Recyclable Wastewater Treatment (original) (raw)
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Preparation of Fe 3 O 4 Nanoparticles and Removal of Methylene Blue through Adsorption
Journal of Physics: Conference Series, 2015
In this work, we studied the catalytic activity, structural properties, and behavior of a Fe 3 O 4 magnetic system. The Fe 3 O 4 nanoparticles were prepared by the thermal decomposition method. X-ray diffraction confirmed the presence of a structural Fe 3 O 4 phase, where acicular shape of the grains is shown. Transmission Mössbauer spectroscopy showed a wide distribution of particle sizes at room temperature, some of these present superparamagnetic behavior and are responsible of paramagnetic sites. The hysteresis loops obtained by the use of a vibrating sample magnetometer showed that these nanoparticles exhibit superparamagnetic behavior. However, the cycles present a significant contribution from a ferrimagnetic component at 2 K, which agrees with Mössbauer results. Through scanning electron microscopy, a tendency to the agglomeration of nanoparticles was observed. Nanoparticle activity in the degradation of methylene blue (MB) was studied through fluorescence spectroscopy, finding dye adsorption properties.
Preparation and application of magnetic Fe3O4 nanoparticles for wastewater purification
Separation and Purification Technology, 2009
Magnetic Fe3O4-SBA-15 mesoporous silica molecular sieves were prepared, characterized and used as sorbent for magnetic separation and recycle. Powder X-ray diffraction data indicated that the structure of Fe3O4-SBA-15 retained the host SBA-15 structure and Brunauer-Emmett-Teller analysis revealed a increase in surface area and pore size, indicating Fe3O4-SBA-15 mixing with the host SBA-15. From scanning electron micrographs, it was found that the structure of the Fe3O4-SBA-15 particles changed with the content of Fe3O4 and SiO2. And the Fe3O4-SBA-15 exhibited strong magnetic properties. The iron content in Fe3O4-SBA-15 was determined by atom adsorption spectroscopy, with the Fe3O4 content increased, the capacity of adsorption decreased, but the quality of Fe3O4-SBA-15 recycled increased, so we must be controlled the proportion of Fe and Si of Fe3O4-SBA-15 mesoporous material, then we could obtain the better material. Fe3O4-SBA-15 was successfully used for absorb phenol and recover in water. Our results suggest wide applicability of Fe3O4-SBA-15 magnetic mesoporous materials for absorption various compounds in water and recover.
Nanomaterials with Tailored Magnetic Properties as Adsorbents of Organic Pollutants from Wastewaters
Inorganics, 2020
Water quality has become one of the most critical issue of concern worldwide. The main challenge of the scientific community is to develop innovative and sustainable water treatment technologies with high efficiencies and low production costs. In recent years, the use of nanomaterials with magnetic properties used as adsorbents in the water decontamination process has received considerable attention since they can be easily separated and reused. This review focuses on the state-of-art of magnetic core–shell nanoparticles and nanocomposites developed for the adsorption of organic pollutants from water. Special attention is paid to magnetic nanoadsorbents based on silica, clay composites, carbonaceous materials, polymers and wastes. Furthermore, we compare different synthesis approaches and adsorption performance of every nanomaterials. The data gathered in this review will provide information for the further development of new efficient water treatment technologies.
Recent progress in Fe3O4based magnetic nanoparticles: from synthesis to application
Materials Science and Technology, 2016
Fe 3 O 4 based magnetic polymer nanoparticles (MPNPs) are densely studied for several decades. These Fe 3 O 4 based MPNPs can be used in wastewater treatment and biological field such as magnetic resonance imaging contrast agents, hyperthermia therapy and protein separation. The Fe 3 O 4 based MPNPs are attractive because they combine the advantages of magnetism and polymers together. In order to obtain the practical application in the above mentioned areas, the bare Fe 3 O 4 needs to be functionalised with different kinds of molecules like organic small molecules and polymers and some inorganic molecules like silica, metals and carbon. In this review, the chemical preparation methods, different modification methods and various applications of the Fe 3 O 4 based MPNPs are introduced.
AIJR Publisher in Proceedings of First Conference for Engineering Sciences and Technology (CEST-2018), September 25-27,, 2018
Water contamination by synthetic dyes is considered as a serious environmental issue, globally. In this study, the adsorptive removal of a very toxic cationic dye, methylene blue (MB), from aqueous solution was investigated using spinel ferrite, CoFe1.9Cr0.1O4 (CFC), magnetic nanoparticles as an adsorbent. CoFe1.9Cr0.1O4 powder was successfully synthesized via a sol-gel process and characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) techniques. The effect of various experimental parameters on MB removal including; contact time, initial dye concentration, adsorbent dosage, solution pH and temperature were investigated. The results revealed that about 94 % of MB was removed under the optimal operational conditions. The adsorption kinetics showed that adsorption data were better described by pseudo-second-order model (PSO). In addition, the adsorption isotherms follow Langmuir isotherm model and the maximum monolayer adsorption capacity was found to be 11.41 mg/g. The calculated thermodynamic parameters (i.e., ∆G o , ∆H o , ∆S o) indicate that the proposed adsorption process of methylene blue onto CoFe1.9Cr0.1O4 nanoparticles is exothermic and spontaneous in nature. The results suggest that the synthesized magnetic nanoparticles (CFC) can be employed for the removal of toxic cationic synthetic dyes from wastewater.
Environmental Sustainability
In present study, novel magnetic nanocomposites based on an agro-based material, non-toxic and biocompatible xyloglucan (XG) with magnetic iron oxide (Fe 3 O 4) were synthesized by a simple, safe and ecofriendly sonication method. The synthesized nanocomposites (XG-Fe 3 O 4) were characterized by various analytical techniques such as powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM)-energy dispersive X-ray (EDX), transmission electron microscopy (TEM)-EDX analysis and selected-area electron diffraction (SAED). The average crystallite size of the nanocomposites as estimated by the Scherrer analysis were in the range of 17-20 nm and thus exhibited no significant difference in mean particle size on changing the ratios of Fe 3 O 4 and Xyloglucan. The high resoloution (HR) TEM analysis revealed nanorod like shape of synthesized Fe 3 O 4 nanoparticles. Lattice fringes of the individual crystallites were seen in the HRTEM image, indicative of their good crystallinity. The distance of 0.29 nm was found in between the lattice fringes that confirmed the cubic structure of nanoparticles. The FTIR spectrum of nanocomposite indicated the interaction of functional groups in XG with the Fe 3 O 4 nanoparticles at the surface. The SEM analysis revealed the average crystal size of pure Fe 3 O 4 nanocrystals to be 22.4 nm. The SAED analysis revealed that the nanocomposites (20 nm) were very close to behaving as superparamagnets at room temperature. A preliminary study on removal of methylene blue (MB) dye from aqueous solution indicated that the nanocomposite has potential to be used for photocatalytic and adsorptive removal of MB from aqueous solutions.
Synthesis Features of Iron Oxide Nanopowders with High Magnetic and Sorption Properties
Materials Science Forum
The magnetic particles of iron oxides are promising materials for the purification of water from ions of heavy metals and radionuclides. Their advantage compared to other sorbents is the ability to extract by applied magnetic field, which greatly simplifies the task of extraction, separation and processing in cleaning technologies. The aim of this work is investigation of temperature and concentration of iron in the solution effect on the phase composition, nanoparticle size and their magnetization. Phase magnetite in the sample increases with increasing temperature and the magnetization decreases slightly with increasing the initial concentration of iron in solution. We found that regardless of the conditions of deposition formed spherical particles whose average size ranges from 7 to 15 nm. The sorptive capacity of the particles is virtually independent of the phase composition and for cobalt is about 18 mg/g. For sorption-based material magnetic particles Fe3O4 recommended to car...