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A novel quinone/reduced graphene oxide composite as a solid-phase redox mediator for chemical and biological Acid Yellow 36 reduction

机译:新型醌/还原氧化石墨烯复合物作为固相氧化还原介质,用于化学和生物酸性黄36还原

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摘要

A novel quinone-modified graphene material was developed to enhance the catalytic performance of graphene for the transformation of environmental pollutants. Graphene oxide (GO) was first reduced with diethylenetriamine and the obtained NH2-RGO was further covalently modified with anthraquinone-2-sulfonic acid (AQS). The prepared AQS-modified RGO (AQS-RGO) was characterized by XPS, IR and SEM, respectively. The catalytic performance of AQS-RGO was investigated during azo dye Acid Yellow 36 (AY 36) decolorization. It was shown that pH and temperature had significant effects on AY 36 chemical decolorization by Na2S. At the pH of 6.0, AQS-RGO exhibited better catalytic performance compared with NH2-RGO due to the lower activation energy of the AQS-RGO amended system. AY 36 bio-decolorization could be enhanced in a dose-dependent manner with AQS-RGO. In the presence of 25 mg L-1 AQS-RGO, the AY 36 bio-decolorization rate was 6.7-fold higher than that mediated by NH2-RGO, indicating that AQS-RGO is a better electron-transfer mediator. Based on the above results, the electron transfer pathways of AQS-RGO-mediated AY 36 decolorization were proposed. These findings indicate that the application of AQS-RGO is a feasible method to enhance the treatment of azo dye-containing wastewater.
机译:开发了一种新型的醌改性石墨烯材料,以增强石墨烯对环境污染物转化的催化性能。首先用二亚乙基三胺还原氧化石墨烯(GO),然后用蒽醌-2-磺酸(AQS)对获得的NH2-RGO进行共价改性。制备的AQS修饰的RGO(AQS-RGO)分别用XPS,IR和SEM表征。在偶氮染料酸性黄36(AY 36)脱色过程中研究了AQS-RGO的催化性能。结果表明,pH和温度对Na 2 S对AY 36化学脱色有显着影响。在6.0的pH值下,由于AQS-RGO修饰体系的活化能较低,因此与NH2-RGO相比,AQS-RGO表现出更好的催化性能。 AQS-RGO可以剂量依赖的方式增强AY 36的生物脱色。在25 mg L-1 AQS-RGO存在下,AY 36的生物脱色率比NH2-RGO介导的高6.7倍,表明AQS-RGO是更好的电子传递介质。基于以上结果,提出了AQS-RGO介导的AY 36脱色的电子转移途径。这些发现表明,AQS​​-RGO的应用是增强含偶氮染料废水处理的可行方法。

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