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

An intensified-Fenton process for the treatment of phenol aqueous solutions has been studied as a continuous catalytic wet hydrogen peroxide oxidation system. This process consists of coupling the catalytic activity of a heterogeneous Fenton-like catalyst with the homogeneous contribution of its dissolved iron species. Agglomerated mesoporous SBA-15 silica-supported iron oxide (Fe2O3/SBA-15) material was used as heterogeneous catalyst. The influence of the reaction temperature and the initial hydrogen peroxide dosages was studied in order to minimize the operation cost of the process. The catalytic performance of the process was assessed in terms of total organic carbon (TOC) and hydrogen peroxide conversions. Likewise, the stability of the solid Fenton-like catalyst was also evaluated in terms of the dissolved iron species. The increase of the reaction temperature enhanced the TOC conversion and reduced the iron leaching from the heterogeneous catalyst. These results were related to the degradation of oxalic acid as responsible for iron extraction by formation of soluble stable iron complexes into the aqueous medium. Finally, the use of a moderate hydrogen peroxide concentration (2.6 g/L) and milder temperatures (80–120 °C) has led to remarkable results of TOC and phenol reductions as well as oxidant efficiency through the intensified-Fenton process.

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Synthesis, Spectroscopic and Structural Characterization of the First Mononuclear, Water Soluble Iron−Citrate Complex, (NH4)5Fe(C6H4O7)2·2H2O

Journal of the American Chemical Society ◽

10.1021/ja9807035 ◽

1998 ◽

Vol 120 (50) ◽

pp. 13266-13267 ◽

Cited By ~ 106

Author(s):

M. Matzapetakis ◽

C. P. Raptopoulou ◽

A. Tsohos ◽

V. Papaefthymiou ◽

N. Moon ◽

...

Keyword(s):

Structural Characterization ◽

Water Soluble ◽

Iron Citrate ◽

Soluble Iron ◽

Citrate Complex

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Degradation of the herbicide tebuthiuron using solar photo-Fenton process and ferric citrate complex at circumneutral pH

Journal of Photochemistry and Photobiology A Chemistry ◽

10.1016/j.jphotochem.2007.04.022 ◽

2007 ◽

Vol 191 (2-3) ◽

pp. 187-192 ◽

Cited By ~ 89

Author(s):

M.R.A. Silva ◽

A.G. Trovó ◽

R.F.P. Nogueira

Keyword(s):

Ferric Citrate ◽

Fenton Process ◽

Citrate Complex ◽

Circumneutral Ph

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Low temperature and in-field Mössbauer spectroscopic studies of ε-Fe3N particles synthesized from iron–citrate complex

Chemical Physics Letters ◽

10.1016/j.cplett.2010.05.044 ◽

2010 ◽

Vol 493 (4-6) ◽

pp. 299-303 ◽

Cited By ~ 16

Author(s):

Sajith Kurian ◽

N.S. Gajbhiye

Keyword(s):

Low Temperature ◽

Spectroscopic Studies ◽

Iron Citrate ◽

Citrate Complex

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Investigation of carbazole degradation by the sono-Fenton process

Water Science & Technology ◽

10.2166/wst.2013.245 ◽

2013 ◽

Vol 68 (3) ◽

pp. 608-613 ◽

Cited By ~ 1

Author(s):

G.-D. Ji ◽

X.-R. Zhang ◽

F. Guo

Keyword(s):

Present Report ◽

Degradation Process ◽

Ultrasonic Power ◽

Acidic Ph ◽

Fenton Process ◽

Optimal Conditions ◽

Alkaline Ph ◽

Fenton Reagent ◽

Initial Ph ◽

Ph Range

The present report aimed to describe the roles of ultrasonic power and reaction time in the Fenton reagent-based degradation of carbazole in wastewater, and to analyze the effects of the Fe2SO4 and H2O2 concentrations and the initial pH on the reaction kinetics. Application of 40 or 80 W of ultrasound at a frequency of 40 KHz substantially improved the effectiveness of carbazole degradation, whereas application of 20 W of ultrasound had little effect. The optimal concentration of the Fe2SO4·7H2O catalyst was lower for extended operating times. Increased degradation was observed with increasing H2O2 concentrations below 1.8 mg L−1, whereas decreased degradation was observed at concentrations above this value. The best performance was obtained at a neutral or slightly alkaline pH range (pH 7–9) rather than at the commonly used acidic pH range (pH 2–4). Under optimal conditions, the extent of carbazole degradation was 98% after 180 min. The degradation process followed second-order kinetics.

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Development of a Novel Magnetic Reactor Based on Nanostructured Fe3O4@PAA as Heterogenous Fenton Catalyst

Catalysts ◽

10.3390/catal9010018 ◽

2018 ◽

Vol 9 (1) ◽

pp. 18 ◽

Cited By ~ 2

Author(s):

María Gamallo ◽

Lucía Fernández ◽

Carlos Vázquez-Vázquez ◽

Alfonso Fondado ◽

Jorge Mira ◽

...

Keyword(s):

Batch Reactor ◽

Fenton Process ◽

Dissolved Iron ◽

Reactive Blue 19 ◽

Catalytic Potential ◽

Iron Salts ◽

Fenton Catalyst ◽

Superparamagnetic Properties ◽

Fe3o4 Mnps ◽

Marked Tendency

With the recent development of nanotechnology, magnetic nanoparticles (mNPs) have received increasing attention as potential heterogeneous Fenton catalysts in wastewater treatment applications, as an alternative to the conventional Fenton process using dissolved iron salts. Due to their superparamagnetic properties, Fe3O4 mNPs can be easily recovered and reused by applying a magnetic field. However, Fe3O4 mNPs have a marked tendency to form aggregates in water, leading to a decrease in their catalytic yield. To overcome these limitations, this work explores the catalytic activity of Fe3O4 coated with poly(acrylic acid) (Fe3O4@PAA) as stabilized Fenton heterogeneous nanocatalyst, in the degradation of C.I. Reactive Blue 19 (RB19). To maximize the catalytic potential of Fe3O4@PAA, an experimental design based on the Response Surface Methodology (RSM) has been developed to optimize the conditions of the Fenton process in terms of Fe3O4@PAA concentration (100–300 mg L−1) and H2O2 dose (100–400 mg L−1). Based on the results obtained, a novel sequential batch reactor (SBR) coupled to an external magnetic separation system has been developed, guaranteeing the complete retention of the mNPs in the system. This system allows the reuse of Fe3O4@PAA for at least 10 consecutive cycles, with a successful decolorization of RB19 after 4 h of treatment.

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