Frequent cyanobacterial blooms pose a serious threat to the aquatic ecosystem and human health, so developing an efficient algae removal method is a long-term goal for bloom management. Current technologies for algal bloom control need urgent improvement in terms of algicide recovery, eco-friendliness and cost. Here we propose a contact-electro-catalytic method, using polytetrafluoroethylene (PTFE) film as a reusable catalyst. This contact-electro-catalytic approach involves the generation of reactive oxygen species (e.g., O•, HO•, O and HO) through water-PTFE contact electrification under the low-frequency ultrasonic waves, facilitating the inactivation of algae. The removal rate of the cyanobacterium () exposured to the water-PTFE contact-electro-catalytic system is almost five times greater than that of ultrasound alone after 5 h. A mechanistic investigation revealed that the contact-electro-catalytic system damaged the photosynthetic activity, antioxidant system and membrane integrity of the cells. Additionally, LC-MS metabolomic analysis indicated that this system caused substantial significant disruptions in the TCA cycle, amino acid metabolism, purine metabolism and phospholipid metabolism. Three-dimensional fluorescence spectroscopy suggested contact-electro-catalysis could further availably degrade the organic matter. We anticipate that this method can provide an eco-friendly, highly efficient and economic approach for effective control of harmful algal blooms.

中文翻译：

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低频超声辅助接触电催化高效灭活铜绿微囊藻


频繁的蓝藻水华对水生生态系统和人类健康构成严重威胁，因此开发高效的除藻方法是水华管理的长期目标。目前的藻类水华控制技术在杀藻剂回收、生态友好性和成本方面亟待改进。在这里，我们提出了一种接触电催化方法，使用聚四氟乙烯（PTFE）薄膜作为可重复使用的催化剂。这种接触电催化方法涉及在低频超声波下通过水-PTFE接触带电产生活性氧（例如O•、H2O•、O和H2O），从而促进藻类的灭活。暴露于水-PTFE接触电催化系统5小时后，蓝藻()的去除率几乎是单独超声波的五倍。机制研究表明，接触电催化系统损害了细胞的光合作用、抗氧化系统和膜完整性。此外，LC-MS 代谢组学分析表明，该系统对 TCA 循环、氨基酸代谢、嘌呤代谢和磷脂代谢造成严重破坏。三维荧光光谱表明接触电催化可以进一步有效地降解有机物。我们预计该方法可以为有效控制有害藻华提供一种环保、高效且经济的方法。