Quinone-modified graphene powder is not reusable in bio-treatment systems, and the roles of quinone and graphene during extracellular electron-transfer processes remain unclear. In this study, we prepared anthraquinone-2-sulfonate and reduced graphene-oxide-modified polyurethane foam (AQS-rGO-PUF) and found that AQS-rGO-PUF exhibited higher catalytic performance on Acid Red 18 (AR 18) bio-decolorization compared with AQS-PUF and rGO-PUF. We observed a significant synergistic effect between AQS and rGO in AQS-rGO-PUF-mediated system in the presence of 50 μM AQS and 1.63 mg/L rGO. The synergistic effect was mainly attributed to electron transfer from AQS to rGO either directly or via flavins secreted by strain RQs-106, and ultimately to AR 18, accounting for ~33.47% of AR 18 removal during AQS-rGO-PUF-mediated decolorization. Additionally, AQS-rGO-PUF exhibited good mechanical properties and maintained its macroporous structure. Furthermore, after eight rounds of experiments using AQS-rGO-PUF, the bio-decolorization efficiency of AR 18 retained >98.18% of its original value. These results indicate that the combination of AQS-rGO-PUF and Shewanella strains show potential efficacy for enhancing the treatment of azo-dye-containing wastewater.

醌改性的石墨烯粉末不可在生物处理系统中重复使用，并且醌和石墨烯在细胞外电子转移过程中的作用仍不清楚。在这项研究中，我们制备了蒽醌-2-磺酸盐和还原性氧化石墨烯改性的聚氨酯泡沫（AQS-rGO-PUF），发现AQS-rGO-PUF对酸性红18（AR 18）生物脱色具有较高的催化性能。与AQS-PUF和rGO-PUF相比。我们观察到在存在50μMAQS和1.63 mg / L rGO的情况下，AQS和rGO在AQS-rGO-PUF介导的系统中具有显着的协同作用。协同效应主要归因于电子从AQS直接或通过RQs-106菌株分泌的黄素从AQS转移到rGO，最终归因于AR 18，占AQS-rGO-PUF介导的脱色过程中AR 18去除的〜33.47％。此外，AQS-rGO-PUF表现出良好的机械性能并保持其大孔结构。此外，在使用AQS-rGO-PUF进行了八轮实验后，AR 18的生物脱色效率保持了其原始值的98.18％以上。这些结果表明，AQS​​-rGO-PUF和希瓦氏菌菌株显示出增强含偶氮染料废水处理的潜在功效。