In this study, a bipolar visible light responsive photocatalytic fuel cell (PFC) was constructed by loading a Z-scheme g-C3N4/ carbon black/BiOBr and a Ti3C2/ MoS2 Schottky heterojunction on the carbon brush to prepare the photoanode and photocathode, respectively. It greatly improved the electron transfer and achieved efficient degradation of organic pollutants such as antibiotics and dyes simultaneously in two chambers of the PFC system. The Z-scheme g-C3N4/carbon black/BiOBr formed by adding highly conductive carbon black to g-C3N4/BiOBr not only effectively separates the photogenerated carriers, but also simultaneously retains the high reduction of the conduction band of g-C3N4 and the high oxidation of the valence band of BiOBr, improving the photocatalytic performance. The exceptional performance of Ti3C2/ MoS2 Schottky heterojunction originated from the superior electrical conductivity of Ti3C2 MXene, which facilitated the separation of photogenerated electron–hole pairs. Meanwhile, the synergistic effect of the two photoelectrodes further improved the photocatalytic performance of the PFC system, with degradation rates of 90.9% and 99.9% for 50 mg L− 1 tetracycline hydrochloride (TCH) and 50 mg L− 1 rhodamine-B (RhB), respectively, within 180 min. In addition, it was found that the PFC also exhibited excellent pollutant degradation rates under dark conditions (79.7%, TCH and 97.9%, RhB). This novel pollutant degradation system is expected to provide a new idea for efficient degradation of multiple pollutant simultaneously even in the dark.

Performance study of g-C3N4carbon blackBiOBr@Ti3C2MoS2 photocatalytic fuel cell for the synergistic degradation of different types of pollutants
    Abstract
    1 Introduction
    2 Experimental section
        2.1 Materials
        2.2 Preparation of photocatalysts
            2.2.1 g-C3N4
            2.2.2 BiOBr
            2.2.3 g-C3N4BiOBr
            2.2.4 Ti3C2
            2.2.5 MoS2
            2.2.6 Ti3C2MoS2
        2.3 Preparation of the photoanode and photocathode
        2.4 Construction of the PFC system
        2.5 Characterization 
        2.6 Photoelectrochemical analysis
        2.7 Performance evaluation of the PFC 
    3 Results and discussion
        3.1 Characterization of photoelectrodes
        3.2 Electrochemical performance analysis
        3.3 Influence of different specific gravity of photoanode materials and the external resistance on degradation effect
        3.4 Influence of different concentrations of TCH and the photoelectrode on the pollutants degradation rate
        3.5 Influence of light and aeration on the effect of the PFC
        3.6 The performance comparison of the PFC with the photocatalyst
        3.7 Electron transport and pollutant degradation mechanism in the PFC
    4 Conclusions
    Anchor 27
    Acknowledgements 
    References

• Huilin Guo(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Tingting Yu(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China, Marine Resources Development Institute of Jiangsu, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Lei Zhao(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Jun Qian(CECEP Zhaosheng Environmental Protection Co., Ltd, Yixing 214262, People’s Republic of China)
• Jiahe Yu(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Yu Zhang(Lianyungang Gaopin Renewable Resources Co., Ltd, Lianyungang 222005, China)
• Yongyue Teng(School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, People’s Republic of China)
• Chunshui Zhu(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Tao Yang(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Wenbin Chen(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Picheng Gong(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Cuishuang Jiang(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Changfei Gao(School of Environmental and Material Engineering, Yantai University, Yantai 264005, People’s Republic of China)
• Bing Yang(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)
• Chenyu Yang(School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China)