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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Iron Oxide Nanoparticle-assisted Arsenic Removal From Aqueous System
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Iron Oxide Nanoparticle-assisted Arsenic Removal From Aqueous System

机译：氧化铁纳米粒子辅助去除水系统中的砷

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摘要

Iron oxide nanoparticles (IONPs) can play a significant role in the cycling of heavy metals. Arsenite [As(III)] is highly toxic, mobile, and predominant species in arsenic-contaminated groundwater. IONPs have been synthesized and tested for the removal of As(III) from arsenic contaminated water. In this work, we synthesized IONPs, as a finely divided loose nanopowder, using a chemical method involving a dispersion of the metal cations (Fe~(3+)) through polymer molecules of polyvinyl alcohol (PVA) in an aqueous medium. X-ray diffraction (XRD) analysis confirmed the formation of a single phase rhombohedral crystal structure of R3c space group. Transmission electron microscopic images corroborate the result of IONPs of 45 nm average size and the rhombohedral shape. Selective experiments, conducted with an initial concentration of 0.25 ppm of As(III), have demonstrated the maximum As(III) adsorption capacity (96%) in 2.0 gL~(-1) IONPs in water at pH 4.5-7.5. At room temperature, the adsorption isotherm studies have revealed a better correlation with the Langmuir isotherm than the Freundlich isotherm. Characteristic surface hydrolysis of IONPs as = Fe-OH species has been studied in terms of the vibration bands. The results reveal that the removal of the As(III) species from water is associated with the As(III) adsorption onto the IONPs followed by a surface hydrolysis of the iron species.
机译：氧化铁纳米粒子（IONPs）在重金属循环中可以发挥重要作用。砷[As（III）]是受砷污染的地下水中的剧毒，易移动且占优势的物种。已合成IONP，并测试了从砷污染水中去除As（III）的能力。在这项工作中，我们使用涉及金属阳离子（Fe〜（3+））通过聚乙烯醇（PVA）的聚合物分子在水性介质中分散的化学方法，合成了IONPs，它是一种细分的松散纳米粉末。 X射线衍射（XRD）分析证实了R3c空间群的单相菱面体晶体结构的形成。透射电子显微镜图像证实了平均大小为45 nm的菱形和六面体形状的IONP结果。初始浓度为0.25 ppm的As（III）的选择性实验表明，在pH 4.5-7.5的水中2.0 gL〜（-1）IONPs中，As（III）的最大吸附容量（96％）。在室温下，吸附等温线研究表明与Langmuir等温线的相关性比Freundlich等温线更好。已经根据振动带研究了作为Fe-OH物种的IONPs的表面特征水解。结果表明，从水中去除As（III）物种与As（III）吸附到IONP上有关，然后铁物种发生表面水解。

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