Inactivation of MS-2 phage (a) and E. coli (b) in the presence or absence of Fe2+ (2 μM) and/or t-BuOH (30 mM) in illuminated TiO2 suspensions, compared with the degradation of pCBA (c). N, concentration of microorganisms (in cfu or pfu per millimeter); N0, initial N; C, concentration of pCBA; C0, initial C.