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Removal of Cr(VI) Species from Aqueous Solution by Different Nanoporous Materials

机译：不同纳米孔材料去除水溶液中的六价铬

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Background: The removal of toxic metals from sewage and wastewaters is one of the most important concerns in the twenty first century. The removal of poisonous Cr(VI) from aqueous solution by different low-cost available nanoporous adsorbents was investigated in the present study. Methods: Fumed silica, bentonite (BN), hydrotalcite (HT), MCM-41, Na-Y, mordenite (MOR) and SAPO-34 were used at different adsorbent-to-metal ion ratios. Two predominant species of Cr were considered including chromate and hydrogen chromate ions. Results: Both HT and Na-Y adsorbed the toxic bichromate ions more favorably than other sorbents. Overall, the efficiency of the Cr removal followed the sequence of HT > SAPO-34 > MOR > MCM-41 > Na-Y > silica > BN. Because of its surface chemistry, HT with an uptake of 65.2 mg/g showed the highest toxic abatement among the seven adsorbents investigated under the acidic conditions, followed by the microporous materials SAPO-34 and MOR with uptakes of 41.2 and 41.0 mg/g, respectively. Conclusion: Both HT and Na-Y adsorbed the toxic bichromate ions more favorably than other sorbents. The high pore volume and the apparent surface area of a non-functionalized MCM-41 were not effective in the adsorption of Cr compounds. Overall, HT was the best choice owing to its appropriate surface chemistry with respect to the Cr oxygenates.
机译：背景：从污水和废水中去除有毒金属是二十世纪最重要的问题之一。在本研究中研究了通过不同的低成本可用的纳米孔吸附剂从水溶液中去除有毒的六价铬。方法：使用气相二氧化硅，膨润土（BN），水滑石（HT），MCM-41，Na-Y，丝光沸石（MOR）和SAPO-34，其吸附剂与金属离子的比例不同。铬的两个主要种类被认为是铬酸根和铬酸氢根离子。结果：HT和Na-Y均比其他吸附剂更好地吸附了有毒的重铬酸根离子。总体而言，Cr的去除效率遵循HT> SAPO-34> MOR> MCM-41> Na-Y>二氧化硅> BN的顺序。由于其表面化学性质，在酸性条件下研究的7种吸附剂中HT的吸收量最高，为65.2 mg / g，其次是微孔物质SAPO-34和MOR，其最大吸收量为41.2和41.0 mg / g。分别。结论：HT和Na-Y均比其他吸附剂更有利地吸附有毒的重铬酸根离子。未官能化的MCM-41的高孔体积和表观表面积对Cr化合物的吸附无效。总体而言，由于HT与Cr含氧化合物具有适当的表面化学性质，因此HT是最佳选择。

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