Bionanocomposites based on layered silicates and cationic starch as eco-friendly adsorbents for hexavalent chromium removal.
Bionanocomposites based on layered silicates and cationic starch as eco-friendly adsorbents for hexavalent chromium removal.
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DOI：
10.1039/c4dt00330f
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发表时间：
2014-06
影响因子：
4
通讯作者：
Y. Koriche;M. Darder;P. Aranda;S. Semsari;E. Ruiz-Hitzky
中科院分区：
文献类型：
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作者：
Y. Koriche;M. Darder;P. Aranda;S. Semsari;E. Ruiz-Hitzky
基于两层硅酸盐、称为 Cloisite®Na 的商业蒙脱土和来自阿尔及利亚的天然膨润土，通过插入阳离子淀粉制备了功能性生物纳米复合材料，合成了两种不同的取代度（0.85 和 0.55）。通过 XRD 和 zeta 电位测量对制备的生物纳米复合材料进行表征后，进行批量研究以评估水溶液中六价铬阴离子的吸附能力。研究了吸附等温线、吸附动力学以及pH值对过程的影响。在NO3(-)、ClO4(-)、SO4(2-)和Cl(-)等竞争性阴离子存在下评估去除效率。为了使吸附剂再生以供重复使用，在两种不同的萃取剂溶液（pH 10 的 0.1 M NaCl 和 pH 12 的 0.28 M Na2CO3）中研究了再生过程。
Functional bionanocomposites based on two layered silicates, the commercial montmorillonite known as Cloisite®Na and a natural bentonite from Algeria, were prepared by intercalation of cationic starch, synthesized with two different degrees of substitution, 0.85 and 0.55. After characterization of the prepared bionanocomposites by XRD and zeta potential measurements, batch studies were conducted to evaluate the adsorption capacity of hexavalent chromium anions from aqueous solution. The adsorption isotherms, adsorption kinetics, and the effect of pH on the process were studied. The removal efficiency was evaluated in the presence of competing anions such as NO3(-), ClO4(-), SO4(2-) and Cl(-). In order to regenerate the adsorbent for its repeated use, the regeneration process was studied in two different extractant solutions, 0.1 M NaCl at pH 10 and 0.28 M Na2CO3 at pH 12.