Dissolved organic matter modified magnetic carbon nanotubes enhance the bioremediation of azo dyes and Cr(VI),Environmental Science: Water Research & Technology

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Dissolved organic matter modified magnetic carbon nanotubes enhance the bioremediation of azo dyes and Cr(VI)
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-05-15 , DOI: 10.1039/c9ew00965e
Caiwen He _{1,

2,

3,

4} , Lipeng Gu _{4,

5,

6,

7,

8} , Huan He _{1,

2,

3,

4,

9} , Zhe Zhang _{9,

10,

11,

12,

13} , Xiaoxia Wang _{1,

2,

3,

4} , Fengxia Han _{1,

2,

3,

4} , Bin Huang _{1,

2,

3,

4,

14} , Xuejun Pan _{1,

2,

3,

4,

14}

Affiliation

Dissolved organic matter and Fe(III) species can serve as electron shuttles in the bioreduction of various pollutants in water treatment, but their residuals are also regarded as contaminants. Herein, immobilization of dissolved organics and Fe on carbon nanotubes still possess electron transfer capacity. Meanwhile, it could also lessen secondary pollution caused by residual DOM and Fe in bioreduction. In this study, anthraquinone-2-sulfonic acid (AQS) or humic acids were immobilized together with Fe₃O₄ on carbon nanotubes. The morphologies, structures and functional groups of the resulting materials were characterized. Nanotubes bearing AQS or humic acids both demonstrated high Cr(VI) and methyl orange reduction effectiveness at pH 8.0. The Cr(VI) and methyl orange were reduced by capturing electrons from microbial metabolism, with the DOM_ox/DOM_red and Fe(III)/Fe(II) cycles promoting the process. The nanotube catalysts showed excellent stability and reusability. This study provided an innovative method for simultaneous bioremediation of Cr(VI) and methyl orange dye in wastewater.

中文翻译：

溶解的有机物修饰的磁性碳纳米管增强了偶氮染料和Cr（VI）的生物修复

在水处理中各种污染物的生物还原中，溶解的有机物和Fe（III）物种可以用作电子穿梭，但它们的残留物也被视为污染物。在此，将溶解的有机物和Fe固定在碳纳米管上仍然具有电子转移能力。同时，还可以减少生物还原过程中残留的DOM和Fe引起的二次污染。在这项研究中，蒽醌-2-磺酸（AQS）或腐殖酸与Fe ₃ O ₄一起固定在碳纳米管上。表征了所得材料的形态，结构和官能团。带有AQS或腐殖酸的纳米管均显示出高Cr（VI）和在pH 8.0下的甲基橙还原效果。Cr（VI）和甲基橙通过捕获微生物代谢中的电子而减少，而DOM _ox / DOM_红和Fe（III）/ Fe（II）循环促进了这一过程。纳米管催化剂显示出优异的稳定性和可重复使用性。这项研究提供了一种创新的方法，可以同时生物修复废水中的Cr（VI）和甲基橙染料。

更新日期：2020-07-02

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