Title
Virus removal and inactivation by iron (hydr)oxide-mediated Fenton-like processes under sunlight and in the dark
Date Issued
01 January 2013
Access level
open access
Resource Type
journal article
Author(s)
Escuela Politécnica Federal de Lausana
Publisher(s)
Royal Society of Chemistry
Abstract
Advanced oxidation processes (AOPs) have emerged as a promising alternative to conventional disinfection methods to control microbial water quality, yet little is known about the fate of viruses in AOPs. In this study, we investigated the fate of MS2 coliphage in AOPs that rely on heterogeneous Fenton-like processes catalyzed by iron (hydr)oxide particles. Both physical removal of viruses from solution via adsorption onto particles as well as true inactivation were considered. Virus fate was studied in batch reactors at circumneutral pH, containing 200 mg L-1 of four different commercial iron (hydr)oxide particles of similar mesh sizes: hematite (α-Fe 2O3), goethite (α-FeOOH), magnetite (Fe 3O4) and amorphous iron(iii) hydroxide (Fe(OH) 3). The effect of adsorption and sunlight exposure on the survival of MS2 was considered. On a mass basis, all particles exhibited a similar virus adsorption capacity, whereas the rate of adsorption followed the order FeOOH > Fe2O3 > Fe3O4 ≈ Fe(OH)3. This adsorption behavior could not be explained by electrostatic considerations; instead, adsorption must be governed by other factors, such as hydrophobic interactions or van der Waals forces. Adsorption to three of the particles investigated (α-FeOOH, Fe3O 4, Fe(OH)3) caused virus inactivation of 7%, 22%, and 14%, respectively. Exposure of particle-adsorbed viruses to sunlight and H 2O2 resulted in efficient additional inactivation, whereas inactivation was negligible for suspended viruses. The observed first-order inactivation rate constants were 6.6 × 10-2, 8.7 × 10-2, 0.55 and 1.5 min-1 for α-FeOOH, α-Fe2O3, Fe3O4 and Fe(OH) 3 respectively. In the absence of sunlight or H2O 2, no inactivation was observed beyond that caused by adsorption alone, except for Fe3O4, which caused virus inactivation via a dark Fenton-like process. Overall our results demonstrate that heterogeneous Fenton-like processes can both physically remove viruses from water as well as inactivate them via adsorption and via a particle-mediated (photo-)Fenton-like process. © 2013 The Royal Society of Chemistry and Owner Societies.
Start page
1596
End page
1605
Volume
12
Issue
9
Language
English
OCDE Knowledge area
Patología
Scopus EID
2-s2.0-84882431434
PubMed ID
Source
Photochemical and Photobiological Sciences
ISSN of the container
1474905X
Sponsor(s)
National Science Foundation: 200020-131918. National Science Foundation: 200021-118077
Sources of information: Directorio de Producción Científica Scopus