College of Civil Engineering, Fuzhou University, 350116 Fujian, China; Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, 350002, Fujian, China.
College of Civil Engineering, Fuzhou University, 350116 Fujian, China.
Chemosphere. 2024 Jan;347:140710. doi: 10.1016/j.chemosphere.2023.140710. Epub 2023 Nov 16.
In recent years, photocatalytic technology has been increasingly used for the treatment of algal blooms in water bodies due to its high efficiency and environmental advantages. However, conventional semiconductor materials suffer from high electron-hole recombination rate, low carrier mobility and weak surface adsorption ability, which made their photocatalytic performance limited. Therefore, the photocatalytic performance of the composites can be improved by coupling another semiconductor material to form a heterojunction to accelerate electron transfer. In this study, a novel composite AgVO/BiVO (ABV) photocatalyst was successfully prepared by in-situ deposition method for the photocatalytic inactivation of Microcystis aeruginosa (M. aeruginosa) under visible light. The photocatalyst showed excellent photocatalytic activity, and the degradation rate of M. aeruginosa chlorophyll a was up to 99.8% within 4 h under visible light. During the photocatalytic degradation, the morphology of algae cells, the permeability of cell membrane, the organic matter inside and outside the cells, the antioxidant system and the soluble protein were seriously damaged. Moreover, three cycle experiments showed that the prepared ABV photocatalyst had high reusability. Finally, a possible mechanism of M. aeruginosa inactivation was proposed. In general, the synthesized ABV photocatalyst can effectively inactivate cyanobacteria under visible light and provided a new method for M. aeruginosa removal in water.
近年来，由于光催化技术具有高效、环保等优点，越来越多地用于水体中藻类的处理。然而，传统的半导体材料存在电子-空穴复合率高、载流子迁移率低、表面吸附能力弱等问题，限制了其光催化性能。因此，通过将另一种半导体材料耦合形成异质结来加速电子转移，可以提高复合材料的光催化性能。本研究采用原位沉积法成功制备了一种新型复合 AgVO/BiVO（ABV）光催化剂，用于可见光下对铜绿微囊藻（M. aeruginosa）的光催化灭活。该光催化剂表现出优异的光催化活性，在可见光下 4 h 内对 M. aeruginosa 叶绿素 a 的降解率高达 99.8%。在光催化降解过程中，藻细胞的形态、细胞膜的通透性、细胞内外的有机物、抗氧化系统和可溶性蛋白受到严重破坏。此外，经过三次循环实验，表明所制备的 ABV 光催化剂具有较高的可重复使用性。最后，提出了一种可能的 M. aeruginosa 灭活机制。总之，所合成的 ABV 光催化剂可有效在可见光下灭活蓝藻，为水中 M. aeruginosa 的去除提供了一种新方法。
