Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil.
Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Environ Technol. 2020 Mar;41(8):959-970. doi: 10.1080/09593330.2018.1515989. Epub 2018 Oct 4.
FeO nanoparticles were prepared by co-precipitation of Fe and Fe and then modified with Au to produce an effective adsorbent (FeO/Au) for aqueous Hg(II) in contaminated water. Rietveld refinement on the XRD pattern confirmed that the FeO/Au was synthesised. Mössbauer spectra exhibited broad and asymmetric resonance lines with two sextets which can be assigned to tetrahedral Fe; and octahedral Fe/Fe. The quantitative analysis of magnetite confirms that the sample shows around 3 wt.% Au and 97 wt.% partially oxidised FeO. High surface area: 121 m g, average pore sizes: 6.3 nm and pore volume: 1.64 cm g. The kinetics data were better fitted with a pseudo-second-order and Dubinin-Radushkevich isotherm suggests the Hg(II) adsorption onto FeO/Au nanoparticles was mainly by chemical adsorption forming complex with the Au metal immobilised on FeO surfaces. Adsorption capacity of 79.59 mg g. Ionic strength and co-existing ions had a slight influence on the adsorption capacity.
通过共沉淀法制备了 FeO 纳米粒子，然后用 Au 对其进行修饰，得到了一种有效的吸附剂（FeO/Au），用于去除受污染水中的 Hg(II)。XRD 图谱的 Rietveld 精修证实了 FeO/Au 的合成。穆斯堡尔谱显示出宽而不对称的共振线，具有两个 sextets，可归因于四面体 Fe 和八面体 Fe/Fe。磁铁矿的定量分析证实，该样品含有约 3wt%的 Au 和 97wt%部分氧化的 FeO。高比表面积：121m²/g，平均孔径：6.3nm，孔体积：1.64cm³/g。动力学数据更符合准二级动力学和 Dubinin-Radushkevich 等温线，表明 Hg(II)在 FeO/Au 纳米粒子上的吸附主要是通过化学吸附形成与 Au 金属在 FeO 表面固定的复合物。吸附容量为 79.59mg/g。离子强度和共存离子对吸附容量的影响较小。
