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Efficient removal of hexavalent chromium from water by an adsorption–reduction mechanism with sandwiched nanocomposites

机译：夹层纳米复合材料的吸附-还原机理可有效去除水中的六价铬

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Hexavalent chromium Cr( VI ), one of the most toxic contaminants, is released in the environment due to various anthropogenic activities. This study presents a novel sandwiched nanocomposite synthesized using graphene oxide (GO), manganese dioxide (MnO _(2) ) nanowires, iron oxide (Fe _(3) O _(4) ) nanoparticles and polypyrrole (PPy) to remove hexavalent chromium ion Cr( VI ) from water by an adsorption–reduction mechanism. In the sandwiched nanocomposites, GO provided enough surface area, functional groups, and hydrophilic surface for efficient absorption. Fe _(3) O _(4) nanoparticles with excellent magnetic properties make it easy to separate and recover from water. Under acidic conditions, MnO _(2) nanowires act as both template and oxidant to initiate the polymerization of pyrrole monomers on its freshly activated surface to obtain GO/MnO _(2) /Fe _(3) O _(4) /PPy (designated as GMFP) nanocomposite. GMFP could effectively adsorb Cr( VI ) through electrostatic attraction, and the adsorbed Cr( VI ) ions were partly reduced to trivalent chromium Cr( III ) (62%), resulting in the efficient adsorption and high removal of Cr( VI ) from water. Hexavalent chromium adsorption by GMFP is strongly pH dependent and the adsorption kinetics followed the pseudo-second-order model. The Langmuir isothermal model described the adsorption isotherm data well and the maximum adsorption capacity was up to 374.53 mg g ~(?1) at pH 2.0. These experimental results suggested that GMFP had great potential as an economic and efficient adsorbent of hexavalent chromium from wastewater, which has huge application potential.
机译：六价铬Cr（VI）是最剧毒的污染物之一，由于各种人为活动而释放到环境中。这项研究提出了一种新型的夹心纳米复合材料，该复合材料使用氧化石墨烯（GO），二氧化锰（MnO _（2））纳米线，氧化铁（Fe _（3）O _（4））纳米颗粒和聚吡咯（PPy）合成以去除六价铬通过吸附-还原机理从水中吸收六价铬（VI）。在夹层的纳米复合材料中，GO提供了足够的表面积，官能团和亲水性表面，可有效吸收。具有出色磁性的Fe _（3）O _（4）纳米颗粒使其易于从水中分离和回收。在酸性条件下，MnO _（2）纳米线同时充当模板和氧化剂，从而在其新鲜活化的表面上引发吡咯单体的聚合，从而获得GO / MnO _（2）/ Fe _（3）O _（4）/ PPy （称为GMFP）纳米复合材料。 GMFP可以通过静电吸引有效地吸附Cr（VI），吸附的Cr（VI）离子部分还原为三价铬Cr（III）（62％），从而有效地吸附水中的Cr（VI） 。 GMFP对六价铬的吸附强烈依赖于pH值，吸附动力学遵循伪二级模型。 Langmuir等温模型很好地描述了吸附等温线数据，在pH 2.0时最大吸附容量高达374.53 mg g〜（？1）。这些实验结果表明，GMFP作为一种经济高效的废水中六价铬吸附剂具有广阔的应用前景。

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