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Superbugs in groundwater are posing severe health risks through waterborne pathways. An emerging approach for green disinfection lies at photocatalysis, which levers the locally generated superoxide radical (·O2−) for neutralization. However, the spin-forbidden feature of O2 hinders the photocatalytic generation of active ·O2−, and thus greatly limited the disinfection efficiency, especially for real groundwater with a low dissolved oxygen (DO) concentration. Herein, we report a class of strained Mo4/3B2-xTz MBene (MB) with enhanced adsorption/activation of molecular O2 for photocatalytic disinfection, and find the strain induced spin polarization of In2S3/Mo4/3B2-xTz (IS/MB) can facilitate the spin-orbit hybridization of Mo sites and O2 to overcome the spin-forbidden of O2, which results in a 16.59-fold increase in ·O2− photocatalytic production in low DO condition (2.46 mg L-1). In particular, we demonstrate an In2S3/Mo4/3B2-xTz (50 mg)-based continuous-flow-disinfection system stably operates over 62 h and collects 37.2 L bacteria-free groundwater, which represents state-of-the-art photodisinfection materials for groundwater disinfection. Most importantly, the disinfection capacity of the continuous-flow-disinfection system is 25 times higher than that of commercial sodium hypochlorite (NaOCl), suggesting the practical potential for groundwater purification. Photocatalytic disinfection is a known pollution-free water treatment strategy. However, its efficiency is limited due to the spin-forbidden feature of O2, which hinders photocatalytic ·O2− formation and limits its disinfection efficiency. Here the authors produce a strained Mo4/3B2-xTz MBene that can increase ·O2− photocatalytic production, which results in high levels of photocatalytic disinfection. [ABSTRACT FROM AUTHOR]