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Adsorption and reduction of hexavalent chromium on magnetic greigite (Fe3S4)-CTAB: leading role of Fe(ii) and S(?ii)

机译:磁性绢铁矿(Fe3S4)-CTAB上六价铬的吸附和还原:Fe(ii)和S(?ii)的主导作用

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In this study, a facile one-step route was used to synthesize a novel magnetic mesoporous greigite (Fe _(3) S _(4) )-CTAB composite, which was utilized to remove hexavalent chromium (Cr( VI )). The optimized Fe _(3) S _(4) -CTAB _(0.75) composite with a CTAB dosage of 0.75 g possessed the maximum specific surface, showing the highest Cr( VI ) adsorption capacity of 330.03 mg g ~(?1) . The mechanism analysis revealed that Fe( II ) and S(? II ) were critical for the reduction of Cr( VI ). CTAB can promote the removal of Cr( VI ) by Fe _(3) S _(4) -CTAB composites, possibly due to increased S(? II ) concentration, better dispersion of nanoparticles, and greater zeta potential. Besides, there is mild effect of Fe ~(0) on Cr( VI ) removal, which is confirmed by the disappearance of the Fe ~(0) peak from the XPS analysis. The pseudo-second-order kinetic model could explain the Cr( VI ) removal processes well. The adsorption of Cr( VI ) at different initial concentrations was more consistent with a Langmuir isotherm. The existence of H ~(+) was beneficial for Cr( VI ) removal by Fe _(3) S _(4) -CTAB _(0.75) . Our work confirmed that the obtained Fe _(3) S _(4) -CTAB _(0.75) composites exhibit considerable potential for Cr( VI ) removal from aqueous solution.
机译:在这项研究中,一种简便的一步法被用来合成一种新型的磁性介孔钙锌矿(Fe _(3)S _(4))-CTAB复合材料,该复合材料用于去除六价铬(Cr(VI))。 CTAB用量为0.75 g的优化的Fe _(3)S _(4)-CTAB _(0.75)复合材料具有最大的比表面积,显示出330.03 mg g〜(?1)的最高Cr(VI)吸附能力。 。机理分析表明,Fe(II)和S(?II)对Cr(VI)的还原至关重要。 CTAB可以促进Fe _(3)S _(4)-CTAB复合材料对Cr(VI)的去除,这可能是由于S(?II)浓度增加,纳米颗粒的分散性更好以及zeta电位更高。此外,Fe〜(0)对Cr(VI)的去除有轻微的影响,这可以通过XPS分析中的Fe〜(0)峰消失来确认。伪二级动力学模型可以很好地解释Cr(VI)的去除过程。 Cr(VI)在不同初始浓度下的吸附与Langmuir等温线更为一致。 H〜(+)的存在有利于Fe _(3)S _(4)-CTAB _(0.75)去除Cr(VI)。我们的工作证实,所获得的Fe _(3)S _(4)-CTAB _(0.75)复合材料具有从水溶液中去除Cr(VI)的巨大潜力。

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