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首页> 外文期刊>RSC Advances >Preparation of a Mg/Al/Fe layered supramolecular compound and application for removal of Cr(VI) from laboratory wastewater
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Preparation of a Mg/Al/Fe layered supramolecular compound and application for removal of Cr(VI) from laboratory wastewater

机译：Mg / Al / Fe层状超分子化合物的制备及其在实验室废水中去除Cr（VI）的应用

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Herein, a Mg/Al/Fe layered supramolecular compound (Mg/Al/Fe-LDH) was fabricated via a co-precipitation method with a Mg/Al/Fe mixed solution and used to remove Cr(VI) in laboratory wastewater. The physicochemical properties of the materials were studied using X-ray diffraction patterns, Fourier transform spectra, N2 adsorption–desorption isotherms, pore size distribution curves, and scanning electron microscopy and X-ray photoelectron spectroscopy images. Mg/Al/Fe-LDH was prepared with the Mg(II)?:?Fe(II)?:?Al(III) molar ratios of 5?:?1?:?2 and aged at 80 °C for 24 h. Structural analysis showed that the Mg/Al/Fe-LDH was a layered supramolecular compound. The optimal removal process of calcined Mg/Al/Fe-LDH (Mg/Al/Fe-CLDH) for Cr(VI) was as follows: the pH value was 9–10 and the adsorption process was carried out at room temperature for 100 min. It was found that the saturated adsorption capacity reached 725.61 mg g?1, much higher than that of the calcined Mg/Al layered supramolecular compound (Mg/Al-CLDH) (199.41 mg g?1). The main reason for this high saturated adsorption capacity of the material was that Cr(VI) was reduced to Cr(III) by Fe(II) in the LDH host layer, and then, Cr(III) combined with OH? to yield Cr(OH)3. The sorption kinetics of Mg/Al/Fe-CLDH for Cr(VI) were appropriately described by the pseudo-second order, Elovich, and intraparticle diffusion models. Furthermore, Mg/Al/Fe-CLDH exhibited excellent regenerative property. Hence, Mg/Al/Fe-LDH could be potentially used as a structured adsorbent for Cr(VI) in laboratory wastewater.
机译：本文采用共沉淀法用Mg / Al / Fe混合溶液制备了Mg / Al / Fe层状超分子化合物（Mg / Al / Fe-LDH），并用于去除Cr（实验室废水中的 VI ）。使用X射线衍射图，傅立叶变换光谱，N 2 吸附-解吸等温线，孔径分布曲线以及扫描电子显微镜对材料的理化性质进行了研究。 X射线光电子能谱图像。 Mg / Al / Fe-LDH用Mg（ II ）？：？Fe（ II ）？：？Al（ III ）制备摩尔比为5∶1∶1∶1∶2，并在80℃下老化24小时。结构分析表明，Mg / Al / Fe-LDH是层状超分子化合物。煅烧Mg / Al / Fe-LDH（Mg / Al / Fe-CLDH）对Cr（ VI ）的最佳去除工艺为：pH值为9-10，吸附过程为在室温下进行100分钟。发现饱和吸附容量达到725.61 mg g ？1 ，远远高于煅烧的Mg / Al层状超分子化合物（Mg / Al-CLDH）（ 199.41 mg g ？1 ）。材料具有如此高的饱和吸附能力的主要原因是Cr（ VI ）被Fe（ II 还原为Cr（ III ）。 ），然后将Cr（ III ）与OH ？ 结合以生成Cr（OH） 3 。 Mg / Al / Fe-CLDH对Cr（ VI ）的吸附动力学用拟二级，Elovich和颗粒内扩散模型进行了描述。此外，Mg / Al / Fe-CLDH表现出优异的再生性能。因此，Mg / Al / Fe-LDH可以作为实验室废水中Cr（ VI ）的结构吸附剂。

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