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Evenly distribution of amorphous iron sulfides on reconstructed Mg-Al hydrotalcites for improving Cr(VI) removal efficiency
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2021-03-05 , DOI: 10.1016/j.cej.2021.129228
Ruixin Yan , Xiuping Feng , Long Kong , Qun Wan , Weilin Zheng , Takeshi Hagio , Ryoichi Ichino , Xinde Cao , Liang Li

Hexavalent Chromium (Cr(VI)) in water is a public health concern and has been a challenging research subject in environmental field for many years. Herein, a novel composite material consisting of amorphous iron sulfides supported on hydrotalcites (FeS/HTs) was synthesized by “calcination-reconstruction-calcination” process, which enables homogeneous distribution of iron and sulfur on the surface of hydrotalcites (HT). The composite (mass ratio of FeS/HT was 1/2) could effectively remove over 98% of Cr(VI) within 10 min. A pseudo-second-order kinetic model and a Langmuir isotherm model were well fitted the sorption data with a maximum removal capacity of 206.2 mg/g. The superior adsorption capacity of FeS/HTs could be attributed to the combination of the advantages of abundant adsorption sites on HT and powerful reduction properties of iron sulfides. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis suggested the adsorbed Cr(VI) on the surface and interlayer of FeS/HTs had been reduced to Cr(III) by reductant iron and sulfur. This study demonstrated that FeS/HTs has potential application prospects in Cr(VI) removal.



中文翻译:

非晶态硫化铁在重构的Mg-Al水滑石上均匀分布以提高Cr(VI)去除效率

水中的六价铬(Cr(VI))是一个公共卫生问题,多年来一直是环境领域中一个充满挑战的研究课题。在此,通过“煅烧-重构-煅烧”工艺合成了由负载在水滑石上的无定形硫化铁组成的新型复合材料,该方法能够使铁和硫均匀地分布在水滑石(HT)的表面上。复合材料(FeS / HT的质量比为1/2)可在10分钟内有效去除98%以上的Cr(VI)。拟二级动力学模型和Langmuir等温线模型很好地拟合了吸附数据,最大去除量为206.2 mg / g。FeS / HTs的超强吸附能力可归因于HT上丰富的吸附位和硫化铁的强大还原性能的优势。X射线衍射(XRD)和X射线光电子能谱(XPS)分析表明,FeS / HTs的表面和中间层吸附的Cr(VI)已被还原剂铁和硫还原为Cr(III)。这项研究表明,FeS / HTs在去除Cr(VI)中具有潜在的应用前景。

更新日期:2021-03-11
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