The effect of γ-Fe_2O_3 nanoparticles on bisphenol A(BPA)biodegradation by white rot fungus(Pleurotus ostreatus)was investigated.Interestingly,the addition of γ-Fe_2O_3 nanoparticles enhanced BPA degradation efficie...The effect of γ-Fe_2O_3 nanoparticles on bisphenol A(BPA)biodegradation by white rot fungus(Pleurotus ostreatus)was investigated.Interestingly,the addition of γ-Fe_2O_3 nanoparticles enhanced BPA degradation efficiency by as much as 32% after 3 d in the presence of an environmentally relevant concentration of H_2O_2.The γ-Fe_2O_3-induced BPA degradation enhancement was not due to a commonly assumed Fenton-like reaction catalyzed by γ-Fe_2O_3 or dissolved Fe^(3+) ions.However,γ-Fe_2O_3was bioreduced to Fe_3O_4,which was more efficient at catalyzing the Fenton reaction,producing a highly active hydroxyl radical.The bioreduction of γ-Fe_2O_3 was confirmed by X-ray powder diffraction analysis.This study elucidates the potential biotransformation of nanoparticles in the environment and broadens the application of iron oxide nanoparticles for improved pollutant control.展开更多
基金supported by the National Basic Research Program of China (2014CB932001)the National Natural Science Foundation of China (21237002)the Tianjin Municipal Science and Technology Commission (13JCZDJC35900)
文摘The effect of γ-Fe_2O_3 nanoparticles on bisphenol A(BPA)biodegradation by white rot fungus(Pleurotus ostreatus)was investigated.Interestingly,the addition of γ-Fe_2O_3 nanoparticles enhanced BPA degradation efficiency by as much as 32% after 3 d in the presence of an environmentally relevant concentration of H_2O_2.The γ-Fe_2O_3-induced BPA degradation enhancement was not due to a commonly assumed Fenton-like reaction catalyzed by γ-Fe_2O_3 or dissolved Fe^(3+) ions.However,γ-Fe_2O_3was bioreduced to Fe_3O_4,which was more efficient at catalyzing the Fenton reaction,producing a highly active hydroxyl radical.The bioreduction of γ-Fe_2O_3 was confirmed by X-ray powder diffraction analysis.This study elucidates the potential biotransformation of nanoparticles in the environment and broadens the application of iron oxide nanoparticles for improved pollutant control.
