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首页> 外文期刊>Journal of nanoscience and nanotechnology >Nano-Structured Magnesium Oxide Coated Iron Ore: Its Application to the Remediation of Wastewater Containing Lead
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Nano-Structured Magnesium Oxide Coated Iron Ore: Its Application to the Remediation of Wastewater Containing Lead

机译：纳米结构氧化镁包覆铁矿石的研究及其在含铅废水修复中的应用

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摘要

Magnetically separable nano-structured magnesium oxide coated iron ore (IOMgO) was prepared using environmentally benign chemicals, such as iron ore (10), magnesium(11) nitrate hexahydrate [Mg(NO3)(2)center dot 6H(2)O] and urea; via an easy and fast preparation method. The IOMgO was characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS) and alternating gradient magnetometer (AGM) analyses. The isotherm and kinetic studies indicated that IOMgO has a comparably higher Langmuir constant (K-L, 1.69 L mg(-1)) and maximum sorption capacity (33.9 mg g(-1)) for lead (Pb) than other inorganic media. Based on MgO amount, the removal capacity of Pb by IOMgO was 2,724 mg Pb (g MgO)(-1), which was higher than that (1,980 mg g(-1)) for flowerlike magnesium oxide nanostructures reported by Cao et al. The kinetics, FE-SEM, elemental mapping and XRD results revealed that the substitution followed by precipitation was identified as the mechanism of Pb removal and plumbophyllite (Pb2Si4O10 center dot H2O) was the precipitated phase of Pb. A leaching test revealed that 10mg had negligible concentrations of leached Fe at pH 4-9. Since the base material, IO, is cheap and easily available, IOMgO could be produced in massive amounts and used for remediation of wastewater containing heavy metals, applying simple and fast magnetic separation.
机译：使用环境友好的化学物质，如铁矿石（10），六水合硝酸镁（11）[Mg（NO3）（2）中心点6H（2）O]，制备了可磁分离的纳米结构的氧化镁涂层铁矿石（IOMgO）。和尿素;通过简单快速的准备方法。使用X射线衍射（XRD），场发射扫描电子显微镜（FE-SEM），能量色散X射线光谱（EDS）和交变梯度磁力计（AGM）分析来表征IOMgO。等温线和动力学研究表明，IOMgO具有比其他无机介质更高的朗缪尔常数（K-L，1.69 L mg（-1））和对铅（Pb）的最大吸附容量（33.9 mg g（-1））。基于MgO的量，IOMgO对Pb的去除能力为2,724 mg Pb（g MgO）（-1），高于Cao等人报道的花状氧化镁纳米结构的Pb（g，MgO）（-1）含量（1,980 mg g（-1））。动力学，FE-SEM，元素图谱和XRD结果表明，先沉淀后取代是Pb去除的机理，铅锌矿（Pb2Si4O10中心点H2O）是Pb的沉淀相。浸出试验表明，在pH 4-9下10mg的浸出铁的浓度可忽略不计。由于基础材料IO便宜且易于获得，因此可以大量生产IOMgO，并通过简单快速的磁分离将其用于含重金属废水的修复。

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