The use of manganese dioxide as a heterogeneous catalyst for oxalic acid ozonation in aqueous solution

Andreozzi, Roberto; Insola, A.; Caprio, V.; Marotta, Raffaele; Tufano, Vincenzo

doi:10.1016/0926-860x(95)00247-2

Cited by 206 publications

(124 citation statements)

References 8 publications

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“…The authors ascribed these results to the generation of highly oxidative intermediate species, although they did not propose the mechanism involved. Andreozzi et al [31] described a significant improvement in oxalic acid ozonation at acidic pH induced by the presence of MnO 2 , although they did not account for these findings.…”

Section: Toc Removal During Ozonation Treatmentmentioning

confidence: 50%

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Ozonation of 1,3,6-naphthalenetrisulphonic acid catalysed by activated carbon in aqueous phase

Rivera‐Utrilla

Sánchez‐Polo

2002

Applied Catalysis B: Environmental

201

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This paper presents experimental results of the ozonation of a model aromatic sulphonic compound, 1,3,6-naphthalenetrisulphonic acid (NTS), in the presence of different activated carbons with different physical and chemical surface properties. Carbons used were commercial activated carbons (Ceca AC40, Norit, Merck, Witco, Ceca GAC, Filtrasorb 400, Sorbo) with or without demineralisation pre-treatment. Carbon samples were texturally and chemically characterised using N 2 adsorption isotherms, mercury porosimetry, pH PZC , selective neutralisation and elemental analysis. Results show that NTS was degraded by ozone at a faster rate in the presence of activated carbon, especially in the case of Sorbo, Ceca GAC and Norit carbons, which display catalytic activity, probably by enhancing ozone decomposition in aqueous phase in highly oxidative species. These catalytic properties seem to be favoured by both the basicity of the carbon surface and the higher macropore volume. Dissolved total organic carbon from the NTS degradation compounds was removed in the presence of activated carbon through both the catalytic activity of activated carbon to mineralise organic matter and the adsorption of these organic compounds on activated carbon.

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Section: Toc Removal During Ozonation Treatmentmentioning

confidence: 50%

“…Karpel Vel Letimer et al [30] found that ozonation of salicylic acid, peptides and dissolved humic substances was enhanced when supported metals were present. Moreover, the catalytic activity of MnO 2 and TiO 2 to decompose ozone in aqueous phase is widely known [31,32].…”

Section: Toc Removal During Ozonation Treatmentmentioning

confidence: 99%

Ozonation of 1,3,6-naphthalenetrisulphonic acid catalysed by activated carbon in aqueous phase

Rivera‐Utrilla

Sánchez‐Polo

2002

Applied Catalysis B: Environmental

201

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“…It was developed to overcome the limitations of ozonation processes, such as the formation of byproduct and selective reactions of ozone (9,10). Supported and unsupported metals and metal oxides are the most commonly tested catalysts for the ozonation of organic compounds in water or air (11,12).…”

Section: Introductionmentioning

confidence: 99%

Catalytic Ozonation of Selected Pharmaceuticals over Mesoporous Alumina-Supported Manganese Oxide

Yang

Nie

et al. 2009

Environ. Sci. Technol.

205

101

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Catalytic ozonation of five pharmaceutical compounds (PhACs)sphenazone, ibuprofen, diphenhydramine, phenytoin, and diclofenac sodium in alumina-supported manganese oxide (MnO x ) suspension was carried out with a semicontinuous laboratory reactor. MnO x supported by mesoporous alumina (MnO x /MA) was highly effective in mineralizing the PhACs in aqueous solution. Fourier transform infrared (FTIR) spectroscopy and in situ attenuated total reflection FTIR (ATR-FTIR) spectroscopy were used to examine the interaction of ozone with different catalysts under various conditions. The crucial active sites, surface oxide species at 1380 cm -1 , were formed by the interaction of ozone with Lewis acid sites on the alumina surface. New surface hydroxyl groups at 2915 and 2845 cm -1 were produced by the interaction of the catalyst and ozone in aqueous suspension and became active sites in the presence of MnO x . The introduction of MnO x enhanced the formation and activation of surface hydroxyl groups, causing higher catalytic reactivity. On the basis of these findings, a reaction mechanism is proposed for the catalytic ozonation of PhACs in MnO x / MA suspension.

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“…• OH), known nonselective oxidants (1,2). Specifically, metal oxides are more practical in catalytic ozonation than ionized metals because metal oxides hinder bromate formation in the reaction with ozone and are less pH-sensitive than ionized metals (3,4).…”

Section: Introductionmentioning

confidence: 99%

Characterization and Reactivity of MnO_x Supported on Mesoporous Zirconia for Herbicide 2,4-D Mineralization with Ozone

Xing

et al. 2007

Environ. Sci. Technol.

119

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Manganese oxide was supported on mesoporous zirconia (MnO x / MZIW) by wet impregnation, drying, water washing, and calcinations with manganese acetate tetrahydrate as the metal precursor for the first time and was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fouriertransform infrared spectra (FTIR), temperature-programmed reduction (TPR), temperature-programmed oxygen desorption (O 2 -TPD), and UV-vis diffuse reflectance spectra (UV-vis DRS) measurements. The catalyst was found to be highly effective for the mineralization of 2,4-dichlorophenoxyacetic acid (2,4-D) aqueous solution with ozone. The characterization studies showed that nonstoichiometrically MnO x was highly dispersed on mesoporous zirconia by the strong interaction of the [Mn(H 2 O) 6 ] 2+ complex with surface hydroxyls of the support. Moreover, the multivalence oxidation states of MnO x enhanced the electron transfer, causing the higher catalytic reactivity. On the basis of all information obtained under different experimental conditions, MnO x /MZIW enhanced the mineralization of 2,4-D by the formation of • OH radicals resulting from the catalytic decomposition of ozone.

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The use of manganese dioxide as a heterogeneous catalyst for oxalic acid ozonation in aqueous solution

Cited by 206 publications

References 8 publications

Ozonation of 1,3,6-naphthalenetrisulphonic acid catalysed by activated carbon in aqueous phase

Ozonation of 1,3,6-naphthalenetrisulphonic acid catalysed by activated carbon in aqueous phase

Catalytic Ozonation of Selected Pharmaceuticals over Mesoporous Alumina-Supported Manganese Oxide

Characterization and Reactivity of MnO_x Supported on Mesoporous Zirconia for Herbicide 2,4-D Mineralization with Ozone

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The use of manganese dioxide as a heterogeneous catalyst for oxalic acid ozonation in aqueous solution

Cited by 206 publications

References 8 publications

Ozonation of 1,3,6-naphthalenetrisulphonic acid catalysed by activated carbon in aqueous phase

Ozonation of 1,3,6-naphthalenetrisulphonic acid catalysed by activated carbon in aqueous phase

Catalytic Ozonation of Selected Pharmaceuticals over Mesoporous Alumina-Supported Manganese Oxide

Characterization and Reactivity of MnOx Supported on Mesoporous Zirconia for Herbicide 2,4-D Mineralization with Ozone

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Characterization and Reactivity of MnO_x Supported on Mesoporous Zirconia for Herbicide 2,4-D Mineralization with Ozone