Adsorption of reduced chromium(VI) ions by vitamin C tablets onto a tellurato-functionalized cellulose derivative and its composite with Cyanobacteria green algae in aqueous media,Environmental Progress & Sustainable Energy

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Adsorption of reduced chromium(VI) ions by vitamin C tablets onto a tellurato-functionalized cellulose derivative and its composite with Cyanobacteria green algae in aqueous media
Environmental Progress & Sustainable Energy ( IF 2.1 ) Pub Date : 2021-01-27 , DOI: 10.1002/ep.13608
Eman M. Saad ₁ , Ian S. Butler ₂ , Sahar I. Mostafa ₃

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The removal of toxic chromium(VI) ions from wastewaters in the environment are of considerable importance throughout the world as these ions are known to cause severe medical problems in living organisms. This article describes a novel reduction process for Cr(VI) ions to the less toxic Cr(III) ions in typical wastewaters by using ecofriendly vitamin C tablets as a source of ascorbic acid, which completely reduces Cr(VI) to Cr(III) ions. The efficient adsorption of reduced Cr(VI) ions onto cellulose functionalized with sodium-tellurate, Cell-TeO(OH)₄(ONa)/Cell-Cl {Cell-Te}, both in the absence and the presence of Cyanobacteria green algae (CBGA), has been accomplished. This green algae has polysaccharide binding groups that enhance the adsorption of heavy metal ions. The uptake of reduced Cr(VI) ions by the two sorbents are dependent on the initial pH, contact time, temperature, presence of foreign ions, sorbent dose, and initial Cr(VI) ion concentration. The maximum uptakes of reduced Cr(VI) ions by {Cell-Te} and Cell-TeO(OH)₄(ONa)/Cell-Cl:CBGA; 3:2 w/w {Cell-Te-CBGA} are 56.5 and 88.7 mg g⁻¹, respectively. The hydroxyl and amide groups on the surface of the CBGA most probably play a significant role in facilitating the adsorption capacities of the two sorbents toward Cr(VI) ions.

中文翻译：

维生素 C 片剂对碲化功能化纤维素衍生物及其与蓝藻绿藻复合物在水性介质中的吸附还原铬 (VI) 离子

从环境中的废水中去除有毒的铬 (VI) 离子在全世界都非常重要，因为已知这些离子会对生物体造成严重的医学问题。本文介绍了一种使用环保型维生素 C 片作为抗坏血酸来源，将典型废水中的 Cr(VI) 离子还原为毒性较小的 Cr(III) 离子的新工艺，该过程可将 Cr(VI) 完全还原为 Cr(III)离子。在蓝藻不存在和存在的情况下，还原的 Cr(VI) 离子有效吸附到用碲酸钠功能化的纤维素上，Cell-TeO(OH) ₄ (ONa)/Cell-Cl {Cell-Te}绿藻（CBGA），已经完成。这种绿藻具有多糖结合基团，可增强对重金属离子的吸附。两种吸附剂对还原的 Cr(VI) 离子的吸收取决于初始 pH 值、接触时间、温度、外来离子的存在、吸附剂剂量和初始 Cr(VI) 离子浓度。{Cell-Te}和 Cell-TeO(OH) ₄ (ONa)/Cell-Cl:CBGA对还原 Cr(VI) 离子的最大吸收；3:2 w/w {Cell-Te-CBGA}分别为 56.5 和 88.7 mg g ^-1。CBGA 表面的羟基和酰胺基团最有可能在促进两种吸附剂对 Cr(VI) 离子的吸附能力方面发挥重要作用。

更新日期：2021-01-27

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