Edta Destruction Using The Solar Ferrioxalate Advanced Oxidation Technology (aot) Comparison With Solar Photo-fenton Treatment

Abstract Degradation of ethylenediaminetetraacetic acid (EDTA; in the mmol/l range) at pH 3 was studied by the ferrioxalate/H2O2 process under solar irradiation. A rapid total organic carbon (TOC) removal was attained in all cases, reaching almost 100% after 1 h solar exposure under the best conditions. In order to attain a high TOC removal yield, the pH must be rigorously controlled. The reaction rate increased with H2O2 concentration; but its effect was not very marked. The final extent of degradation was found to decrease with higher ferrioxalate concentrations, probably by competition of oxalate with EDTA or its degradation products. In the absence of oxalate, EDTA could also be degraded to a reasonably good extent, with a TOC removal only slightly lower than when using ferrioxalate, which constitutes a good advantage from the economical point of view. The intensity of solar light was found to be a very important factor to improve the reaction.

[1]  C. A. Parker,et al.  A new sensitive chemical actinometer - II. Potassium ferrioxalate as a standard chemical actinometer , 1956, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[2]  J. Bolton,et al.  The Use of Iron in Advanced Oxidation Processes , 1996 .

[3]  A. Vogler,et al.  Photo-oxidation of organic compound in the presence of titanium dioxide: determination of the efficiency , 1992 .

[4]  S. Canonica,et al.  Determination of the Reaction Quantum Yield for the Photochemical Degradation of Fe(III)-EDTA: Implications for the Environmental Fate of EDTA in Surface Waters. , 1995, Environmental science & technology.

[5]  J. Baeza,et al.  Chemical degradation of EDTA and DTPA in a totally chlorine free (TCF) effluent , 1999 .

[6]  E. Gautier,et al.  Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions , 2001 .

[7]  Marta I. Litter,et al.  Iron-doped titania powders prepared by a sol-gel method. Part II: Photocatalytic properties , 1999 .

[8]  S. McEvoy,et al.  Formation of nitrate and ammonium ions in titanium dioxide mediated photocatalytic degradation of organic compounds containing nitrogen atoms , 1991 .

[9]  A. Maciejewski,et al.  The photophysics, physical photochemistry, and related spectroscopy of thiocarbonyls , 1993 .

[10]  Joseph J. Pignatello,et al.  Evidence for an Additional Oxidant in the Photoassisted Fenton Reaction , 1999 .

[11]  André M. Braun,et al.  Photochemical processes for water treatment , 1993 .

[12]  L. Barton,et al.  Treatment of waste containing EDTA by chemical oxidation , 1999 .

[13]  B. Sulzberger,et al.  Atrazine Degradation in Irradiated Iron/Oxalate Systems: Effects of pH and Oxalate , 1999 .

[14]  H. Brauch,et al.  Verhalten von Ethylendiamintetraacetat (EDTA) und Nitrilotriacetat (NTA) bei der Trinkwasseraufbereitung , 1987 .

[15]  K. Krapfenbauer,et al.  Comparative studies of photo- and radiation-induced degradation of aqueous EDTA. Synergistic effects of oxygen, ozone and TiO2 (acronym: CoPhoRaDe/EDTA) , 1999 .

[16]  D. T. Sawyer,et al.  Fenton Reagents (1:1 FeIILx/HOOH) React Via [LxFeIIOOH(BH+), 1] as Hydroxylases (RH → ROH); NOT as Generators of Free Hydroxyl Radicals (HO·) , 1993 .

[17]  Paul G Tratnyek,et al.  Substituent effects on azo dye oxidation by the FeIII-EDTA-H2O2 system. , 2001, Chemosphere.

[18]  J. Ferguson,et al.  Resistance of EDTA and DTPA to aerobic biodegradation , 1997 .

[19]  M. Litter,et al.  Photocatalytic properties of ZrO2 and Fe/ZrO2 semiconductors prepared by a sol-gel technique , 1999 .

[20]  J. Pignatello.  Dark and photoassisted Fe3+ -catalyzed degradation of chlorophenoxy herbicides by hydrogen peroxide , 1992 .

[21]  F. Frimmel,et al.  Photodegradation of EDTA and NTA in the UV / H2O2 Process , 1995 .

[22]  A. Datye,et al.  Oxidation of Metal−EDTA Complexes by TiO2 Photocatalysis , 1997 .

[23]  M. Litter,et al.  Comparison of the photocatalytic efficiency of TiO2, iron oxides and mixed Ti(IV)Fe(III) oxides: photodegradation of oligocarboxylic acids , 1994 .

[24]  F. Frimmel,et al.  Degradation Pathway of the Photochemical Oxidation of Ethylenediaminetetraacetate (EDTA) in the UV/H2O2‐process , 1998 .

[25]  S. Kagaya,et al.  Photocatalyzed Degradation of Metal-EDTA Complexes in TiO2 Aqueous Suspensions and Simultaneous Metal Removal , 1997 .

[26]  E. Gilbert,et al.  Ozonation of ethylenediaminetetraacetic acid (EDTA) in aqueous solution, influence of pH value and metal ions , 1990 .

[27]  D. N. Furlong,et al.  Photooxidation at Platinum Colloidal TiO2 Aqueous-Solution Interfaces. I. Ethylenediaminetetraacetic Acid and Related-Compounds , 1986 .

[28]  Yuegang Zuo,et al.  Formation of hydrogen peroxide and depletion of oxalic acid in atmospheric water by photolysis of iron(III)-oxalato complexes , 1992 .

[29]  Stefan H. Bossmann,et al.  New Evidence against Hydroxyl Radicals as Reactive Intermediates in the Thermal and Photochemically Enhanced Fenton Reactions , 1998 .

[30]  Marta I. Litter,et al.  Heterogeneous photocatalysis: Transition metal ions in photocatalytic systems , 1999 .

[31]  M. Eberlin,et al.  Photocatalytic Degradation of Phenol and Trichloroethylene: On-Line and Real-Time Monitoring via Membrane Introduction Mass Spectrometry , 1999 .

[32]  G. Colón,et al.  Synthesis, characterization and photocatalytic properties of iron-doped titania semiconductors prepared from TiO2 and iron(III) acetylacetonate , 1996 .