| Autor: |
Song, Jingke, Li, Chenyang, Wang, Xuejiang, Zhi, Songsong, Wang, Xin, Sun, Jianhui |
| Zdroj: |
Frontiers of Environmental Science & Engineering; December 2021, Vol. 15 Issue: 6 |
| Abstrakt: |
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-C3N4coupled with Bi-doped TiO2on 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 TiO2inhibited photogenerated electron-hole pair recombination. With 6 h of visible light illumination, 75.9% of M. aeruginosa(initial concentration = 2.7 × 106cells/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. |
| Databáze: |
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