【摘 要】
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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 photoc
【机 构】
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School of Environment,Key Laboratory for Yellow River and Huai River Water Environment and Pollution
论文部分内容阅读
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-l％(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.
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