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首页> 外文期刊>RSC Advances >The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions
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The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions

机译：用于从水溶液中有效地除去六价铬[Cr（VI）]的新型铁/锰二元氧化物的制备

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To remove hexavalent chromium Cr( VI ) efficiently, a novel Fe–Mn binary oxide adsorbent was prepared via a “two-step method” combined with a co-precipitation method and hydrothermal method. The as-prepared Fe–Mn binary oxide absorbent was characterized via transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectra (FTIR), thermogravimetric analysis (TGA), zeta potential, BET and X-ray photoelectron spectroscopy (XPS). The results indicated that the morphology of the adsorbent was rod-like with length of about 100 nm and width of about 50–60 nm, specific surface area was 63.297 m ~(2) g ~(?1) , has the composition of α-Fe _(2) O _(3) , β-MnO _(2) and MnFe _(2) O _(4) and isoelectric point was observed at pH value of 4.81. The removal of Cr( VI ) was chosen as a model reaction to evaluate the adsorption capacity of the Fe–Mn binary oxide adsorbent, indicating that the Fe–Mn binary oxide adsorbent showed high adsorption performance (removal rate = 99%) and excellent adsorption stability (removal rate > 90% after six rounds of adsorption). The adsorption behavior of the Fe–Mn binary oxide was better represented by the Freundlich model (adsorption isotherm) and the pseudo-second-order model (adsorption kinetic), suggesting that the adsorption process was multi-molecular layer chemical adsorption. The possible adsorption mechanism of the Fe–Mn binary oxide for the removal of Cr( VI ) included the protonation process and the electrostatic attraction interactions.
机译：为了有效地除去六价铬Cr（VI），通过“两步法”与共沉淀法和水热法相结合制备新型Fe-Mn二元氧化物吸附剂。通过透射电子显微镜（TEM），扫描电子显微镜（SEM），X射线衍射（XRD），傅里叶变换红外光谱（FTIR），热重分析（TGA），X射线衍射（SEM），X射线衍射（TGA）。 Zeta电位，BET和X射线光电子能谱（XPS）。结果表明吸附剂的形态是棒状，长度为约100nm，宽度为约50-60nm，比表面积为63.297m〜（2）g〜（α1），具有α的组成-Fe _（2）o _（3），在4.81的pH值下观察到β-mnO _（2）和MnFe _（2）o _（4）和等电点。选择去除Cr（VI）作为模型反应，以评估Fe-Mn二元氧化物吸附剂的吸附能力，表明Fe-Mn二进制氧化物吸附剂显示出高吸附性能（去除率= 99％）和优异的吸附稳定性（六轮吸附后去除率> 90％）。 Fe-Mn二进制氧化物的吸附行为由Freundlich模型（吸附等温线）和伪二阶模型（吸附动力学）表示，表明吸附过程是多分子层化学吸附。用于去除Cr（VI）的Fe-Mn二元氧化物的可能吸附机理包括质子化过程和静电吸引相互作用。

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