The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(VI)] from aqueous solutions

Chuanxi Yang; Tiantian Ju; Xiaoning Wang; Yujia Ji; Cheng Yang; Haojie Lv; Ying Wang; Wenping Dong; Feng Dang; Xifeng Shi; Weiliang Wang; Yuqi Fan

doi:10.1039/C9RA10558A

The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions

Chuanxi Yang,

^ab Tiantian Ju,^c Xiaoning Wang,^d Yujia Ji,^e Cheng Yang,^f Haojie Lv,^a Ying Wang,^a Wenping Dong,^g Feng Dang,^h Xifeng Shi,ⁱ Weiliang Wang

*^aj and Yuqi Fan

*^a

Author affiliations

* Corresponding authors

^a Institute of Environment and Ecology, Shandong Normal University, Jinan 250358, China
E-mail: sdqcsdnu@163.com, yuqifan@sdnu.edu.cn
Fax: +86-531-8618-2550

^b College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China

^c Construction Project Environmental Assessment Service Center of Shandong Province, Jinan 250012, China

^d School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China

^e College of Art and Science, University of Vermont, Burlington, VT 05405, USA

^f School of Physics and Electronics, Shandong Normal University, Jinan 250014, China

^g Shandong Academy of Environmental Science Co., Ltd., Jinan 250013, China

^h Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Shandong University, Jinan 250061, China

ⁱ College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China

^j College of Geography and Environment, Shandong Normal University, Jinan 250358, China

Abstract

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 m² g⁻¹, has the composition of α-Fe₂O₃, β-MnO₂ and MnFe₂O₄ 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.

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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

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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

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