The increase in occurrence and severity of cyanobacteria blooms is causing increasing concern; moreover, human and animal health is affected by the toxic effects of Microcystin-LR released into the water. In this paper, a floating photocatalyst for the photocatalytic inactivation of the harmful algae Microcystis aeruginosa (M. aeruginosa) was prepared using a simple sol-gel method, i.e., coating g-C₃N₄ coupled with Bi-doped TiO₂ on Al₂O₃-modified expanded perlite (CBTA for short). The impact of different molar ratios of Bi/Ti on CBTA was considered. The results indicated that Bi doping in TiO₂ inhibited photogenerated electron-hole pair recombination. With 6 h of visible light illumination, 75.9% of M. aeruginosa (initial concentration = 2.7 × 10⁶ cells/L) and 83.7% of Microcystin-LR (initial concentration =100 µg/L) could be removed with the addition of 2 g/L CBTA-1% (i.e., Bi/Ti molar ratio = 1%). The key reactive oxygen species (ROSs) in the photocatalytic inactivation process are h⁺ and ^⦁OH. The induction of the Bi⁴⁺/Bi³⁺ species by the incorporation of Bi could narrow the bandgap of TiO₂, trap electrons, and enhance the stability of CBTA-1% in the solutions with coexisting environmental substances.

蓝藻水华的发生和严重程度的增加引起了越来越多的关注。此外，人和动物的健康受到释放到水中的微囊藻毒素-LR的毒性作用的影响。本文采用一种简单的溶胶-凝胶法制备了一种浮游光催化剂，用于光催化灭活铜绿微囊藻（M. aeruginosa），即在Al ₂ O上涂覆gC ₃ N ₄和Bi掺杂的TiO ₂。_3-改性膨胀珍珠岩（简称CBTA）。考虑了不同摩尔比的Bi / Ti对CBTA的影响。结果表明，Bi ₂在TiO _2中掺杂抑制了光生电子-空穴对的重组。在6 h的可见光照射下，添加2可以去除75.9％的铜绿假单胞菌（初始浓度= 2.7×10 ⁶细胞/ L）和83.7％的微囊藻毒素-LR（初始浓度= 100 µg / L）。 g / L CBTA-1％（即Bi / Ti摩尔比= 1％）。在光催化灭活过程中的关键活性氧物质（ROSS）是H ⁺和^⦁ OH。通过掺入Bi来诱导Bi ⁴⁺ / Bi ³⁺物种可以缩小TiO ₂的带隙，俘获电子并增强在与环境共存的溶液中CBTA-1％的稳定性。