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Enhanced As(III) oxidation and removal by combined use of zero valent iron and hydrogen peroxide in aerated waters at neutral pH values.
J Hazard Mater. 2015 Oct 30; 297:1-7.JH

Abstract

The oxidation and removal of As(III) by commercially available micro-scale zero-valent iron (mZVI) was studied in aerated synthetic groundwater with initially 6.7 μM As(III) at neutral pH values. Batch experiments were performed to investigate the influence of ZVI and H2O2 concentrations on As(III) oxidation and removal. Oxidation and removal kinetics was significantly increased by increasing ZVI concentration or by adding H2O2 in micromolar concentrations slightly higher than that of initial As(III). Observed half-lifes for arsenic removal without added H2O2 were 81-17 min at ZVI concentrations of 0.15-2.5 g/L, respectively. X-ray absorption spectroscopy (XAS) confirmed that almost all As(III) was converted to As(V) after 2 h of reaction in the pH range 5-9. Addition of 9.6 μM H2O2 to 0.15 g/L ZVI suspensions diminished half-lifes for arsenic removal from 81 to 32 min and for As(III) oxidation from 77 to 8 min, i.e., by approximately a factor of 10. The increased rate of As(III) oxidation is attributable to enhanced formation of oxidants by the Fenton reaction with higher initial concentrations of H2O2. In practice, results of this study suggest that addition of small amounts (<1 mg/L) of H2O2 in various forms (e.g. stable and widely available Na-percarbonate) to water prior to treatment could significantly enhance As(III) oxidation and removal with ZVI.

Authors+Show Affiliations

Aristotle University of Thessaloniki, Department of Chemistry, Division of Chemical Technology, 54124 Thessaloniki, Greece. Electronic address: katsogia@chem.auth.gr.Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstr. 133, CH-8600 Dübendorf, Switzerland.Aristotle University of Thessaloniki, Department of Chemistry, Division of Chemical Technology, 54124 Thessaloniki, Greece.Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstr. 133, CH-8600 Dübendorf, Switzerland.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25935405

Citation

Katsoyiannis, Ioannis A., et al. "Enhanced As(III) Oxidation and Removal By Combined Use of Zero Valent Iron and Hydrogen Peroxide in Aerated Waters at Neutral pH Values." Journal of Hazardous Materials, vol. 297, 2015, pp. 1-7.
Katsoyiannis IA, Voegelin A, Zouboulis AI, et al. Enhanced As(III) oxidation and removal by combined use of zero valent iron and hydrogen peroxide in aerated waters at neutral pH values. J Hazard Mater. 2015;297:1-7.
Katsoyiannis, I. A., Voegelin, A., Zouboulis, A. I., & Hug, S. J. (2015). Enhanced As(III) oxidation and removal by combined use of zero valent iron and hydrogen peroxide in aerated waters at neutral pH values. Journal of Hazardous Materials, 297, 1-7. https://doi.org/10.1016/j.jhazmat.2015.04.038
Katsoyiannis IA, et al. Enhanced As(III) Oxidation and Removal By Combined Use of Zero Valent Iron and Hydrogen Peroxide in Aerated Waters at Neutral pH Values. J Hazard Mater. 2015 Oct 30;297:1-7. PubMed PMID: 25935405.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced As(III) oxidation and removal by combined use of zero valent iron and hydrogen peroxide in aerated waters at neutral pH values. AU - Katsoyiannis,Ioannis A, AU - Voegelin,Andreas, AU - Zouboulis,Anastasios I, AU - Hug,Stephan J, Y1 - 2015/04/15/ PY - 2014/12/04/received PY - 2015/02/11/revised PY - 2015/04/01/accepted PY - 2015/5/4/entrez PY - 2015/5/4/pubmed PY - 2016/5/25/medline KW - Arsenic KW - Hydrogen peroxide KW - Sodium percarbonate KW - X-ray absorption spectroscopy KW - ZVI SP - 1 EP - 7 JF - Journal of hazardous materials JO - J Hazard Mater VL - 297 N2 - The oxidation and removal of As(III) by commercially available micro-scale zero-valent iron (mZVI) was studied in aerated synthetic groundwater with initially 6.7 μM As(III) at neutral pH values. Batch experiments were performed to investigate the influence of ZVI and H2O2 concentrations on As(III) oxidation and removal. Oxidation and removal kinetics was significantly increased by increasing ZVI concentration or by adding H2O2 in micromolar concentrations slightly higher than that of initial As(III). Observed half-lifes for arsenic removal without added H2O2 were 81-17 min at ZVI concentrations of 0.15-2.5 g/L, respectively. X-ray absorption spectroscopy (XAS) confirmed that almost all As(III) was converted to As(V) after 2 h of reaction in the pH range 5-9. Addition of 9.6 μM H2O2 to 0.15 g/L ZVI suspensions diminished half-lifes for arsenic removal from 81 to 32 min and for As(III) oxidation from 77 to 8 min, i.e., by approximately a factor of 10. The increased rate of As(III) oxidation is attributable to enhanced formation of oxidants by the Fenton reaction with higher initial concentrations of H2O2. In practice, results of this study suggest that addition of small amounts (<1 mg/L) of H2O2 in various forms (e.g. stable and widely available Na-percarbonate) to water prior to treatment could significantly enhance As(III) oxidation and removal with ZVI. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/25935405/Enhanced_As_III__oxidation_and_removal_by_combined_use_of_zero_valent_iron_and_hydrogen_peroxide_in_aerated_waters_at_neutral_pH_values_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(15)00329-5 DB - PRIME DP - Unbound Medicine ER -