Virus Removal by Biogenic Cerium

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• 作者：Bart De Gusseme ; Gijs Du Laing ; Tom Hennebel ; Piet Renard ; Dev Chidambaram ; Jeffrey P. Fitts ; Els Bruneel ; Isabel Van Driessche ; Kim Verbeken ; Nico Boon ; Willy Verstraete
• 刊名：Environmental Science & Technology
• 出版年：2010
• 出版时间：August 15, 2010
• 年：2010
• 卷：44
• 期：16
• 页码：6350-6356
• 全文大小：279K
• 年卷期：v.44,no.16(August 15, 2010)
• ISSN：1520-5851

文摘

The rare earth element cerium has been known to exert antifungal and antibacterial properties in the oxidation states +III and +IV. This study reports on an innovative strategy for virus removal in drinking water by the combination of Ce(III) on a bacterial carrier matrix. The biogenic cerium (bio-Ce) was produced by addition of aqueous Ce(III) to actively growing cultures of either freshwater manganese-oxidizing bacteria (MOB) Leptothrix discophora or Pseudomonas putida MnB29. X-ray absorption spectroscopy results indicated that Ce remained in its trivalent state on the bacterial surface. The spectra were consistent with Ce(III) ions associated with the phosphoryl groups of the bacterial cell wall. In disinfection assays using a bacteriophage as model, it was demonstrated that bio-Ce exhibited antiviral properties. A 4.4 log decrease of the phage was observed after 2 h of contact with 50 mg Lp>−1p> bio-Ce. Given the fact that virus removal with 50 mg Lp>−1p> Ce(III) as CeNO₃ was lower, the presence of the bacterial carrier matrix in bio-Ce significantly enhanced virus removal.