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Photocatalytic technology faces challenges in practical applications, such as difficulty in recovering catalysts and the potential for secondary pollution caused by powdered photocatalysts, which limits its promotion in the control of harmful algal blooms. In this study, graphene was in situ polymerized onto the surface of polyester fibers to successfully develop graphene-modified fibers (GMF) as a photocatalyst, and applied to the inactivation and control of cyanobacterial blooms. Under ultraviolet irradiation, GMF exhibited stable photocatalytic performance, continuously inhibiting the growth of Microcystis aeruginosa (with an inhibition rate of 56.4%) and degrading 18.4% of microcystin-LR. The strong oxidative stress induced by GMF led to cellular structural damage and inhibition of photosynthetic activity.At the same time, it enhances the activity of antioxidant enzymes and the levels of non-enzymatic antioxidants. GMF absorbs sufficient energy to induce interband transitions, generating hydroxyl radicals that directly participate in intracellular redox reactions. Although the graphene component has an adsorption effect on nitrogen and phosphorus, studies have confirmed that the photocatalytic pathway is the dominant mechanism for inhibiting algal growth and degrading algal toxins. In continuous flow reactors and pilot-scale enclosed experiments,A 0.2% concentration of GMF inhibited the growth of cyanobacteria by 61.5%–92.2%. These results indicate that GMF provides a green and efficient solution for the control of harmful algal blooms and the simultaneous removal of algal toxins, laying a forward-looking foundation for the practical application of graphene-based photocatalytic materials in environmental management.
Reference News：
https://www.sciencedirect.com/science/article/abs/pii/S1385894726000756?via%3Dihub
