University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Njegoševa 12, 11001 Belgrade, Serbia.
University of Belgrade-Faculty of Chemistry, Studentski trg 12-16, 11001 Belgrade, Serbia.
Bioelectrochemistry. 2022 Jun;145:108088. doi: 10.1016/j.bioelechem.2022.108088. Epub 2022 Feb 17.
The problem of wastewater has long been ubiquitous and has great consequences for the environment and its inhabitants. Microbial fuel cells (MFCs) have enormous potential for the treatment of wastewaters polluted with azo dyes. The amount of energy that can be produced from a single-chamber MFC is sufficient to perform decolorization and degradation of such dyes, which are widely used in the textile industry. This study on the azo dye, reactive black 5 (RB5), provides an alternative method through three parallel-connected MFCs to obtain electricity that directly serves for the dye's electrochemical degradation. We examined degradation followed by decolorization of RB5 using Fe and Pt electrodes, together with HO, to achieve the electro-Fenton process. The amount of voltage produced (295 mV), the current density (276 mA m) and the power density (50 mW m) were sufficient to degrade 25 mg L RB5 dye with 0.5 mM HO in just 2 h. The dye degradation mechanism was investigated using UV-VIS, FT-IR and HPLC-MS/MS. The ecotoxicity of the degradation products was assessed using a bacterial model, Aliivibrio fischeri. These tests showed that there was successful degradation of the dye to products whose toxicity is less than that of RB5.
废水问题长期以来一直普遍存在，对环境及其居民造成了巨大的影响。微生物燃料电池 (MFC) 在处理含偶氮染料的废水方面具有巨大的潜力。单室 MFC 产生的能量足以实现对这些广泛用于纺织工业的染料的脱色和降解。本研究以偶氮染料活性黑 5（RB5）为例，通过三个并联的 MFC 提供了一种替代方法，以获得直接用于染料电化学降解的电力。我们使用 Fe 和 Pt 电极以及 HO 研究了 RB5 的降解和脱色，以实现电芬顿过程。产生的电压（295 mV）、电流密度（276 mA m）和功率密度（50 mW m）足以在 2 小时内用 0.5 mM HO 降解 25 mg L 的 RB5 染料。使用 UV-VIS、FT-IR 和 HPLC-MS/MS 研究了染料降解的机制。使用细菌模型 Aliivibrio fischeri 评估了降解产物的生态毒性。这些测试表明，染料成功降解为毒性小于 RB5 的产物。
