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Catalytic Decomposition of Hydrogen Peroxide on Iron Oxide: Kinetics, Mechanism, and Implications
Shu-Sung Lin,Mirat D. Gurol +1 more
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In this article, the second-order kinetic expression of H2O2 over goethite surface can be described by the second order kinetic expression −d[H 2O2]/dt = k[FeOOH][H2O 2], where k = 0.031 M-1 s-1, at pH 7 in the absence of any inorganic or organic chemical species.Abstract:
This research describes the heterogeneous catalytic reactions of H2O2 with granular size goethite (α-FeOOH) particles in aqueous solution under various experimental conditions. This is an important reaction for the environment since both H2O2 and iron oxides are common constituents of natural and atmospheric waters. Furthermore, iron oxides function as catalysts in chemical oxidation processes used for treatment of contaminated waters with H2O2. The results of this study demonstrated that the decomposition rate of H2O2 over goethite surface can be described by the second-order kinetic expression −d[H2O2]/dt = k[FeOOH][H2O2], where k = 0.031 M-1 s-1, at pH 7 in the absence of any inorganic or organic chemical species. The apparent reaction rate was dominated by the intrinsic reaction rates on the oxide surfaces rather than the mass transfer rate of H2O2 to the surface. The activation energy of the reaction of H2O2 with the iron oxide surface was determined to be 32.8 kJ/M. The reaction mechanism for the de...read more
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Degradation of chlorophenols by means of advanced oxidation processes: a general review
TL;DR: In this paper, the degradation of chlorophenols (CPs) by means of advanced oxidation processes (AOPs) was evaluated during the period 1995-2002 and different mechanistic degradation pathways were taken into account.
Journal ArticleDOI
Review of iron-free Fenton-like systems for activating H2O2 in advanced oxidation processes
Alok Diwakar Bokare,Wonyong Choi +1 more
TL;DR: A thorough review of alternative non-iron Fenton catalysts and their reactivity towards hydrogen peroxide activation is presented, describing in detail the complex mechanisms and emphasizes on practical limitations influencing their environmental applications.
Journal ArticleDOI
Magnetic Nanoscaled Fe3O4/CeO2 Composite as an Efficient Fenton-Like Heterogeneous Catalyst for Degradation of 4-Chlorophenol
Lejin Xu,Jianlong Wang +1 more
TL;DR: The high utilization efficiency of H(2)O(2), calculated as 79.2%, showed a promising application of the catalyst in the oxidative degradation of organic pollutants, and the reusability of Fe(3)O (4)/CeO (2) composite was investigated after six successive runs.
Journal ArticleDOI
Clays and oxide minerals as catalysts and nanocatalysts in Fenton-like reactions — A review
TL;DR: The use of clays and iron-oxide minerals as catalysts of Fenton-like reactions is a promising alternative for the decontamination of soils, groundwaters, sediments, and industrial effluents as discussed by the authors.
Journal ArticleDOI
Degradation of Bisphenol A by Peroxymonosulfate Catalytically Activated with Mn1.8Fe1.2O4 Nanospheres: Synergism between Mn and Fe
TL;DR: Novel Mn1.8Fe1.2O4 nanospheres were synthesized and used to activate PMS for the degradation of bisphenol A (BPA), a typical refractory pollutant, and a synergistic effect between solid-state Mn and Fe was identified in control experiments.
References
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Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution
TL;DR: In this article, the rate constants for over 3500 reaction are tabulated, including reaction with molecules, ions and other radicals derived from inorganic and organic solutes, and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods.
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Photocatalysis: Fundamentals and Applications
Ezio Pelizzetti,Nick Serpone +1 more
TL;DR: In this paper, the reader is first introduced to the meaning of photocatalysis and subsequently taken through the essentials of photochemistry towards bridging it to semiconductor materials, followed by thermodynamic and kinetic aspects.
Journal ArticleDOI
Acidic mine drainage: the rate-determining step
Philip C. Singer,Werner Stumm +1 more
TL;DR: The rate-determining step in the oxidation of iron pyrite and the formation of acidity in streams associated with coal and copper mines isThe oxidation of ferrous iron, and effective pollution abatement necessitates control ling this reaction.
Journal ArticleDOI
Dark and photoassisted Fe3+ -catalyzed degradation of chlorophenoxy herbicides by hydrogen peroxide
TL;DR: In this paper, the herbicides 2,4-dichlorophenoxyacetic acid (2,4D) and 2, 4-5-trichlor-pharmoxyacetics acid(2, 4,5-T) were degraded in acidic aerated solutions of H 2 O 2 and Fe 2+ or Fe 3+.
Journal ArticleDOI
The cycling of iron in natural environments : considerations based on laboratory studies of heterogeneous redox processes
Werner Stumm,Barbara Sulzberger +1 more
TL;DR: The various pathways for the oxygenation of ferrous iron and for the dissolution of Fe(III) (hydr) oxides, especially by reducing ligands with oxygen donor atoms in thermal and photochemical processes, are assessed on the basis of laboratory experiments for application to natural systems.
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