School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China.
Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China.
Environ Sci Pollut Res Int. 2022 Apr;29(20):29993-30003. doi: 10.1007/s11356-021-17857-w. Epub 2022 Jan 8.
In this work, a series of AgPO/g-CN (AG) photocatalysts were synthesized. After characterizing the properties, the effects of mass ratio, light intensity, and material dosages on photodegradation were investigated. The material with a 1/2 mass ratio of AgPO/g-CN showed the highest photocatalytic activity under visible light, and the removal efficiency reached 90.22% for an initial suspended algae concentration of 2.7 × 10 cells/mL, 0.1 g of AG, and 3 h of irradiation. These results showed that the conductivity was increased while the total protein and COD contents of the algae suspension were declined rapidly. In contrast, the variations in the malondialdehyde (MDA) level suggested that the algae cell wall was severely damaged and that selective permeability of the membrane was significantly affected. A possible photocatalytic mechanism was proposed and •O was shown to be the major reactive oxygen species in the photocatalysis. In summary, during the visible light photocatalytic process, the cell structure was destroyed, which caused the leakage of electrolyte, the inactivation of protein, and the inhibition of photosynthesis; finally, the cells died. This study provides a reference for photodegradation of algae pollution in water bodies.
在这项工作中，合成了一系列 AgPO/g-CN（AG）光催化剂。在对其性质进行表征后，研究了质量比、光强和材料剂量对光降解的影响。在可见光下，具有 1/2 质量比的 AgPO/g-CN 的材料表现出最高的光催化活性，对于初始悬浮藻类浓度为 2.7×10 个细胞/mL、AG 为 0.1 g 和照射 3 h 的情况，去除效率达到 90.22%。这些结果表明，导电性增加，而藻类悬浮液的总蛋白和 COD 含量迅速下降。相比之下，丙二醛（MDA）水平的变化表明，藻类细胞壁受到严重破坏，膜的选择性通透性受到显著影响。提出了一种可能的光催化机制，并表明•O 是光催化中的主要活性氧物种。总之，在可见光光催化过程中，细胞结构被破坏，导致电解质泄漏、蛋白质失活和光合作用抑制，最终细胞死亡。本研究为水体中藻类污染的光降解提供了参考。
