ABSTRACT Most studies conducted nowadays to boost electrode performance in microbial fuel cell (MFC) have focused on carbonaceous materials. The titanium suboxides (Ti4O7, TS) are able to provide a new alternative for achieving better performance in MFC and have been tested and demonstrated in this study. The Ti4O7 electrode with high electrochemical activity was modified by graphene/polyaniline by the constant potential method. Electrogenic microorganisms were more conducive to adhere to the anode electrode due to the presence of graphene/polyaniline. The MFC reactor with polyaniline /graphene modified TS (TSGP) anode achieves the highest voltage with 980 mV, and produces a peak power density of 2073 mW/m2, which is 2.9 and 12.7 times of those with the carbon cloth anode, respectively, at the 1000 Ω external resistance. In addition, this study evaluates the effects of anolyte conductivity, pH, and COD on the treatment of oil-containing restaurant wastewater (OCRW) in MFC using TSGP anode. The OCRW amended with 120 mS/cm obtains the lowest internal resistance (160.3 Ω). Increasing the anodic pH, gradually from acidic (pH 5.5) to alkaline conditions (pH 8.0), resulted in a gradual increase in maximum power density to 576.4 mW/m2 and a decrease in internal cell resistance to 203.7 Ω. The MFC at the COD 1500 mg/L could obtain steady-state output voltage during 103 h while removing up to 65.2% of the COD of the OCRW. GRAPHICAL ABSTRACT

中文翻译：

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原位石墨烯/聚苯胺改性氧化钛阳极处理微生物燃料电池含油餐厅废水性能评价

摘要如今为提高微生物燃料电池 (MFC) 中的电极性能而进行的大多数研究都集中在碳质材料上。钛低氧化物 (Ti4O7, TS) 能够为在 MFC 中实现更好的性能提供一种新的替代方法，并且在本研究中已经过测试和证明。用石墨烯/聚苯胺通过恒电位法改性具有高电化学活性的Ti4O7电极。由于石墨烯/聚苯胺的存在，生电微生物更有利于粘附在阳极电极上。带有聚苯胺/石墨烯改性 TS（TSGP）阳极的 MFC 反应器达到了 980 mV 的最高电压，并产生了 2073 mW/m2 的峰值功率密度，分别是带有碳布阳极的那些的 2.9 和 12.7 倍，在1000 Ω 外部电阻。此外，本研究评估了阳极电解液电导率、pH 值和 COD 对使用 TSGP 阳极在 MFC 中处理含油餐厅废水 (OCRW) 的影响。以 120 mS/cm 修正的 OCRW 获得最低内阻 (160.3 Ω)。增加阳极 pH 值，逐渐从酸性 (pH 5.5) 到碱性条件 (pH 8.0)，导致最大功率密度逐渐增加至 576.4 mW/m2，电池内部电阻降低至 203.7 Ω。COD 1500 mg/L 的 MFC 可以在 103 小时内获得稳态输出电压，同时去除高达 65.2% 的 OCRW 的 COD。图形概要 增加阳极 pH 值，逐渐从酸性 (pH 5.5) 到碱性条件 (pH 8.0)，导致最大功率密度逐渐增加至 576.4 mW/m2，电池内部电阻降低至 203.7 Ω。COD 1500 mg/L 的 MFC 可以在 103 小时内获得稳态输出电压，同时去除高达 65.2% 的 OCRW 的 COD。图形概要 增加阳极 pH 值，逐渐从酸性 (pH 5.5) 到碱性条件 (pH 8.0)，导致最大功率密度逐渐增加至 576.4 mW/m2，电池内部电阻降低至 203.7 Ω。COD 1500 mg/L 的 MFC 可以在 103 小时内获得稳态输出电压，同时去除高达 65.2% 的 OCRW 的 COD。图形概要