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The application of iron oxide nanoparticles (IONs) is often limited by agglomeration and low loading. Here, we presented a facile phase change material (PCM) -based sol-gel strategy for the fabrication of α-FeO nanoparticles. Rosin was used as the PCM in the sol-gel process and the carbon-based substrate of α-FeO nanoparticles in the thermal process. The α-FeO nanoparticle embedded rosin-derived biochar(α-FeO@HrBc)were highly dispersed. The dispersity of α-FeO nanoparticle could be regulated by the weight ratios of rosin to FeCl·6HO during the preparation, as evidenced by the scanning electron microscope (SEM) spectrum and the sorption capacity results. Among a series of α-FeO@HrBc nanocomposites, the one with the weight ratios of 1/1.5 rosin/FeCl·6HO had the highest capacity for hexavalent chromium (Cr(VI)) sorption. This phenomenon can be ascribed to a remarkably enhanced interfacial reactivity due to an increase in the dispersity of α-FeO nanoparticle. In addition, SEM showed that the majority of α-FeO nanoparticles was dispersed on and inside the biochar substrate. Batch adsorption experiments revealed that the α-FeO@HrBc adsorbed 90% Cr(VI) within one minute, and the maximum capacity was up to 166 mg·g based on the Langmuir model. The FTIR and XPS spectra revealed that the adsorbed Cr(VI) species were partially reduced to less toxic Cr(III). Considering that α-FeO nanoparticles provided important sorption sites, the newly formed Cr(III) and the remaining Cr(VI) ions could be adsorbed on α-FeO@HrBc via the formation of FeCr coprecipitation.
This article was published in the following journal.
Name: The Science of the total environment
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Iron (II,III) oxide (Fe3O4). It is a black ore of IRON that forms opaque crystals and exerts strong magnetism. The NANOPARTICLES; and MICROSPHERES of its mineral form, magnetite, have many biomedical applications.
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
Iron or iron compounds used in foods or as food. Dietary iron is important in oxygen transport and the synthesis of the iron-porphyrin proteins hemoglobin, myoglobin, cytochromes, and cytochrome oxidase. Insufficient amounts of dietary iron can lead to iron-deficiency anemia.
A multifunctional iron-sulfur protein that is both an iron regulatory protein and cytoplasmic form of aconitate hydratase. It binds to iron regulatory elements found on mRNAs involved in iron metabolism and regulates their translation. Its rate of degradation is increased in the presence of IRON.
Nanoparticles produced from metals whose uses include biosensors, optics, and catalysts. In biomedical applications the particles frequently involve the noble metals, especially gold and silver.