Iron oxides semiconductors are efficients for solar water disinfection: A comparison with photo-Fenton processes at neutral pH

Bacterial inactivation with iron citrate complex: A new source of dissolved iron in solar photo-Fenton process at near-neutral and alkaline pH

“…In the absence of iron ligands, at near-neutral pH, a 89 spontaneous chemical oxidation of Fe 2+ to Fe 3+ by dissolved oxygen in water occurs, 90 involving formation of ferric (hydr)oxides, like Fe 2 O 3 ·nH 2 O [12], which do not re-dissolve in 91 water, thus inhibiting the recycling in solution of Fe 3+ back to Fe 2+ . However, soluble iron in 92 the mg/L range was detected at pH 6.5 in the presence of bacteria, due to siderophores 93 secreted by bacteria and by-products generated from the degradation of bacterial 94 components [10]. So for the use of iron-chelating agents areexclusively being considered for 95 organic pollutants degradation.…”

“…5 shows a comparison (Table 2). In fact, goethite (α-FeO(OH)) and/or lepidocrocite 447 (γ-FeO(OH)), which have been reported to be formed by oxidation of Fe 2+ in solution at 448 neutral pH [10,48], are probably involved in the bacterial inactivation reached after 90 min of 449 treatment (insert in Fig. 5).…”

“…Ferrous iron, in the absence of any other complexing 74 agents, has the tendency to rapidly get oxidized and form different aqua-Fe 3+ Despite its dual advantages of being economic and environmental friendly, the photo-Fenton 85 reaction has not been widely used in microbial disinfection, due to the theoretical requirement 86 of acidic conditions. However, from the seminal paper of Rincón andPulgarín [3]interest has 87 grown over the past few years, in the application of near-neutral photo-Fenton treatment for 88 water and waswater disinfection [4][5][6][7][8][9][10][11]. In the absence of iron ligands, at near-neutral pH, a 89 spontaneous chemical oxidation of Fe 2+ to Fe 3+ by dissolved oxygen in water occurs, 90 involving formation of ferric (hydr)oxides, like Fe 2 O 3 ·nH 2 O [12], which do not re-dissolve in 91 water, thus inhibiting the recycling in solution of Fe 3+ back to Fe 2+ .…”

A review on the classification, characterisation, synthesis of nanoparticles and their application

“…Titanium oxide High surface area, magnetic, inhibits bacterial growth [35] Iron oxide Reactive and unstable [53] Magnetite Magnetic, highly reactive [54] Silicon dioxide Stable, less toxic, able to be functionalize many molecules [55] Zinc oxide Antibacterial, anti-corrosive, antifungal and UV filtering [56] Cerium oxide Antioxidant, low reduction potential [57] Aluminium oxide…”

Constructing highly catalytic oxidation over BiOBr-based hierarchical microspheres: Importance of redox potential of doped cations

“…However, in the Fenton-like reaction, the reduce rate of high-valent metal to low-valent metal by H 2 O 2 is extremely slow [24,25]. Light irradiation can improve the catalytic activity of some semiconductor heterogeneous Fenton catalysts [26][27][28][29]. The decomposition rate of H 2 O 2 becomes one of the crucial factors on the photocatataytic degradation efficiency [30].…”