Efficient Destruction of Pathogenic Bacteria with NiO/SrBi2O4 under Visible Light Irradiation

详细信息    查看全文

• 作者：Chun Hu ; Xuexiang Hu ; Jian Guo ; Jiuhui Qu
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：September 1, 2006
• 年：2006
• 卷：40
• 期：17
• 页码：5508 - 5513
• 全文大小：277K
• 年卷期：v.40,no.17(September 1, 2006)
• ISSN：1520-5851

文摘

The photocatalytic inactivation of pathogenic bacteria inwater was investigated systematically with NiO/SrBi₂O₄ undervisible light (>420 nm) irradiation. The catalyst wasfound to be highly effective in killing Escherichia coli, a Gram-negative bacterium, and Staphylococcus aureus, a Gram-positive bacterium. ESR studies revealed that OH andO₂^- were involved as the active species in the photocatalyticreaction. The decomposition process of the cell wall andthe cell membrane was directly observed by TEM and furtherconfirmed by the determination of potassium ion (K⁺)leakage from the killed bacteria. A possible cell damagemechanism by visible-light-driven NiO/SrBi₂O₄ is proposed.In addition, the effects of pH, methanol, and inorganicions on bacterial photocatalytic inactivation were investigated.These results indicated that the electrostatic forceinteraction of bacteria-catalyst is crucial for high bactericidalefficiency.