Ambient water motions presented in urban drainage systems is a rich source of renewable mechanical energy. Harvesting this energy to trigger the generation of reactive oxygen species (ROS) for water purification is a desirable yet underexplored solution. Herein, the water flow from a spiral reactor to simulate pipeline drainage was utilized to provide mechanical energy to power itself to initiate the piezo-response of molybdenum disulfide (MoS₂) that was added into water flowing in the reactor. The piezocatalytic degradation efficiency of benzothiazole by MoS₂ reached 94.8% after 24 cycles (ca. 144 s), which was 8.8 and 4.9 times higher than that of quiescent solution of MoS₂ and non-piezoelectric commercial MoS₂, respectively. Furthermore, the water flow-driven system can be extended to degrade different kinds of organic contaminants, including benzotriazole and various antibiotics (enrofloxacin, ciprofloxacin, metronidazole, etc.). All target pollutants were degraded with electric energy per order E_EO in the range of 0.0161 to 0.0616 kW h/m³. In this process, the running water from the spiral reactor drove MoS₂ to generate piezoelectric charges, which in turn reacted with dissolved oxygen and water to generate ROS including the hydroxyl radical, superoxide anion, and singlet oxygen to decompose the target pollutants. The system retained piezo-degradation efficiencies (>80%) in different aqueous matrices including rainwater, saline water, and pharmaceutical sewage and could be reused four times maintaining a good performance (>90%). This investigation provides a facile self-powered piezocatalytic process by harnessing ambient energy from the water flow of simulated water drainage to purify wastewater.

中文翻译：

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自供电水流触发压电催化产生活性氧用于模拟排水中的水净化

城市排水系统中的环境水运动是可再生机械能的丰富来源。收集这种能量来触发活性氧 (ROS) 的产生以进行水净化是一种理想但尚未充分探索的解决方案。在此，利用来自螺旋反应器的水流来模拟管道排水，为自身提供机械能以启动添加到反应器中流动的水中的二硫化钼 (MoS _{2 ) 的压电响应。}MoS _{2对苯并噻唑的压电催化降解效率在24个循环（约144 s）后达到94.8%，分别是MoS 2}和非压电商用MoS ₂的8.8倍和4.9倍。， 分别。此外，水流驱动系统可以扩展到降解不同种类的有机污染物，包括苯并三唑和各种抗生素（恩诺沙星、环丙沙星、甲硝唑等）。所有目标污染物均以0.0161 至 0.0616 kW h/m ^{3范围内的每级}E _EO电能降解。在这个过程中，来自螺旋反应器的自来水驱动 MoS ₂产生压电电荷，压电电荷又与溶解氧和水反应生成包括羟基自由基、超氧阴离子和单线态氧在内的ROS，从而分解目标污染物。该系统在包括雨水、盐水和制药污水在内的不同水基质中保持压电降解效率（>80%），并且可以重复使用四次，保持良好的性能（>90%）。这项研究通过利用模拟排水系统的水流中的环境能量来净化废水，提供了一种简单的自供电压电催化过程。