Selectivity of hydrogen peroxide decomposition towards hydroxyl radicals in catalytic wet peroxide oxidation (CWPO) over Fe/AC catalysts

Rey, A.; Bahamonde, A.; Casas, J. A.; Rodríguez, J. J.
June 2010
Water Science & Technology;2010, Vol. 61 Issue 11, p2769
Academic Journal
Two Fe/AC catalysts prepared with different iron precursors (iron nitrate and iron pentacarbonyl) and the same AC support have been tested in H2O2 decomposition in presence and absence of methanol, a known strong scavenger of hydroxyl radicals, to investigate the selectivity towards zOH formation in this reaction and their behavior in the CWPO of phenol. The catalyst prepared with iron nitrate, with the most oxidized surface and the highest Fe surface content, seems to favor a higher selectivity towards zOH formation in CWPO allowing for complete phenol conversion and a significant TOC removal, with the highest mineralization degree at 508C and atmospheric pressure. Fe/AC catalysts were more efficient in the CWPO of phenol than in methanol presence due to a better use of the oxidant since adsorbed phenol on catalyst surface minimizes inefficient H2O2 decomposition to H2O and O2(g). The influence of the initial H2O2 concentration on phenol oxidation with this catalyst was also studied. A theoretical stoichiometric amount of H2O2 for complete oxidation of phenol was chosen as the best starting concentration since auto-scavenging reactions can be minimized and it is sufficient for oxidizing phenol and the aromatic intermediates.


Related Articles

  • Post-discharge plasma-chemical oxidation of Iron(II) complexes. Doubla, A.; Abdelmalek, F.; Khélifa, K.; Addou, A.; Brisset, J.L. // Journal of Applied Electrochemistry;Jan2003, Vol. 33 Issue 1, p73 

    The plasmachemical properties of an electric discharge in humid air are considered by examining the oxidation of Fe(II) to Fe(III) aquo-ions in a solution exposed to the discharge. The reaction product is characterised and quantified by means of the thiocyanate complex FeSCN2+. The reaction...

  • Evaluation of anti-oxidant activity of stem bark and leaves methanolic extract of Ficus mollis (Vahl). Munna, Sreenivasulu; Jayaveera, K. N.; Rao, P. Mallikarjuna; Rao, K. Mallikarjuna; Gobinath, M. // Journal of Pharmacy Research;Sep2010, Vol. 3 Issue 9, p2228 

    Antioxidants are vital substances which possess the ability to protect the body from damages caused by free radical-induced oxidative stress. A variety of free radical scavenging antioxidants is found in plants. The different constituents of the plant were extracted by using continuous hot...

  • In-vitro Antioxidant Activity of methanolic extract of Aerial Parts of Canna indica L. Joshi, Yadunath M.; Kadam, Vilasrao J.; Kaldhone, Prashant R. // Journal of Pharmacy Research;Nov2009, Vol. 2 Issue 11, p1712 

    The requirement of compound with antioxidant activity is increasing as there is realization of that formation of reactive oxygen species (ROS) and reactive nitrogen species (RNS) have been linked in pathogenesis of several human diseases. The herb Canna indica L. is commonly known as Devkali,...

  • Hydrogen Peroxide Decreases Endothelial Nitric Oxide Synthase Promoter Activity through the Inhibition of Sp1 Activity. Kumar, Sanjiv; Xutong Sun; Wiseman, Dean A.; Jing Tian; Umapathy, Nagavedi S.; Verin, Alexander D.; Black, Stephen M. // DNA & Cell Biology;Mar2009, Vol. 28 Issue 3, p119 

    We have previously shown that endothelial nitric oxide synthase (eNOS) promoter activity is decreased in endothelial cells in response to the addition of hydrogen peroxide (H2O2), and this involves, at least in part, the inhibition of AP-1 activity. Thus, the objective of this study was to...

  • Adenine oxidation by pyrite-generated hydroxyl radicals. Cohn, Corey A.; Fisher, Shawn C.; Brownawell, Bruce J.; Schoonen, Martin A. A. // Geochemical Transactions;2010, Vol. 11, p2 

    Cellular exposure to particulate matter with concomitant formation of reactive oxygen species (ROS) and oxidization of biomolecules may lead to negative health outcomes. Evaluating the particle-induced formation of ROS and the oxidation products from reaction of ROS with biomolecules is useful...

  • Free radical scavenging activity of Sargassum siliquosum J. G. Agardh. Corpuz, M. J. A. T.; Osi, M. O.; Santiago, L. A. // International Food Research Journal;2013, Vol. 20 Issue 1, p291 

    The ability of Sargassum siliquosum to prevent the initiation of free radicals to cause cellular damage was investigated in vitro. The plant was extracted exhaustively using methanol and partition using solvents of different polarities. Total phenolic contents (TPC) and flavonoid contents (TFC)...

  • A better understanding of hydroxyl radical photochemical sources in cloud waters collected at the puy de Dôme station - experimental versus modelled formation rates. Bianco, A.; Passananti, M.; Perroux, H.; Voyard, G.; Mouchel-Vallon, C.; Chaumerliac, N.; Mailhot, G.; Deguillaume, L.; Brigante, M. // Atmospheric Chemistry & Physics;2015, Vol. 15 Issue 16, p9191 

    The oxidative capacity of the cloud aqueous phase is investigated during three field campaigns from 2013 to 2014 at the top of the puy de Dôme station (PUY) in France. A total of 41 cloud samples are collected and the corresponding air masses are classified as highly marine, marine and...

  • Principles, Developments and Design Criteria of In Situ Chemical Oxidation. Baciocchi, Renato // Water, Air & Soil Pollution;Dec2013, Vol. 224 Issue 12, p1 

    This paper provides a short overview of the main oxidation processes more commonly applied for the remediation of contaminated sites, with specific reference to their application for the in situ remediation of contaminated sites, i.e. In Situ Chemical Oxidation (ISCO). A review of the main...

  • Hydroxyl radical reactivity at the air-ice interface. Kahan, T. F.; Zhao, R.; Donaldson, D. J. // Atmospheric Chemistry & Physics Discussions;2009, Vol. 9 Issue 5, p20881 

    Hydroxyl radicals are important oxidants in the atmosphere and in natural waters. They are also expected to be important in snow and ice, but their reactivity has not been widely studied in frozen aqueous solution. We have developed a spectroscopic probe to monitor the formation and reactions of...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics