Oxidation of aniline and other primary aromatic amines by manganese dioxide

Laha, Shonali; Luthy, Richard G.

doi:10.1021/es00073a012

Cited by 314 publications

(288 citation statements)

References 18 publications

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“…Figure 9 shows the plot of lnC 0 /C against t where, C represents the concentration of MB at time, t, and C 0 represents the initial concentration of MB. The kinetics of the degradation process fitted to the pseudo-first-order kinetics model well which is in good agreement with the earlier works [12,13,42], where the authors reported the oxidative degradation of a number of organic pollutants with Mn oxides. In the present study, the rate constant (k) was found to be 0.0045 min −1 .…”

Section: Kinetics Of Mb Degradationsupporting

confidence: 90%

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Ullah

Kibria

Akter

et al. 2017

Water Conserv Sci Eng

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Mn 3 O 4 nanoparticles were synthesized from one-step reduction of KMnO 4 with glycerol at 80°C. The structural and surface morphological characterizations were carried out using FT-IR, XRD, and FESEM analyses. The elemental composition was evidenced from EDX analysis. XRD analysis showed the tetragonal crystal geometry of Mn 3 O 4 nanoparticles with an average crystallite size of ∼20 nm. The surface morphology of the Mn 3 O 4 nanoparticles was found to be spherical from the FESEM image. The Mn 3 O 4 nanoparticles were then tested as a potential oxidant for the decolorization of methylene blue (MB) and found to be capable of N-demethylation of MB forming thionine as the final product, and removing 80% of the dye in approximately 1 h. The decolorization of MB by Mn 3 O 4 occurred through a surface mechanism, i.e., formation of surface precursor complex between MB and surface-bound Mn (II, III), where, electron transfer occurs within the surface complex. The effect of suspension pH (3-4 < pH pzc ; 5-10 > pH pzc ) on MB decolorization was assessed. Suspension pH exerted double-edged effects on MB decolorization by influencing the formation of surface precursor complex, and reducing potential of the system.

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Section: Kinetics Of Mb Degradationsupporting

confidence: 90%

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Ullah

Kibria

Akter

et al. 2017

Water Conserv Sci Eng

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“…24,25 Manufacturers that produce dyes, cosmetics, medicines and rubber 26 release these types of materials. The degradation of phenyl and phenylcarbamate pesticides 24,27 can also release these compounds. Because of their threat to the environment, a fast analytical method is required.…”

Section: Introductionmentioning

confidence: 99%

Development of a Solid-Phase Microextraction/Reflection-Absorption Infrared Spectroscopic Method for the Detection of Chlorinated Aromatic Amines in Aqueous Solutions

Yang

Tsai

2001

ANAL. SCI.

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The infrared sensing method is a powerful tool in the detection of organic species in aqueous solutions because its detection speed can be quite fast and it can also provide abundant chemical information about the examined species. Among the detection of organic species in aqueous solutions, attenuated total reflection (ATR) 1 is most suitable to handle aqueous solutions, because the evanescent wave penetrates into the adjoining medium a short distance and, typically, the depth of penetration (dp) is in the range of a few micrometers. Many successful applications of the ATR-IR method can be found in the literature using bare ATR sensing fibers. 2-6 Although the short dp can limit the absorption of a strong absorber, water, the signals of organic species were also limited. To increase the sensitivity, the principle of solid-phase micro-extraction 7-10 was applied to the ATR-IR sensing method. [11][12][13][14][15][16][17][18] The sensitivity of the SPME/ATR-IR method was largely enhanced because SPME films exclude water molecules from the evanescent wave and attract organic species into a region near the sensing crystal to enhance the signal. Although this type of method provides a direct way to detect organic compounds in aqueous solution, a tedious optical arrangement and an expansive ATR crystal are required.To eliminate these weaknesses, transmission absorption (TA) infrared spectroscopy has also been applied to detect small amounts of organic compounds in aqueous solutions by combining the principle of SPME to that of the transmission mode. Successful applications can be found in the literature. [19][20][21] For example, poly(dimethylsiloxane), 19 parafilm, 20 and perfluoroalkoxy Teflon 21 have been used as the SPME phase to extract organic compounds in aqueous solutions, and be sequentially detected by the TA-IR method. Although this method can eliminate the use of expensive IR windows, problems arise in preparing the standing films, which should exhibit low compactness, high IR radiation transmission, and a small variation after soaking in aqueous solutions. These problems restrict the application of the TA-IR method to detect organic compounds in aqueous solutions, especially in the detection of more polar compounds.To eliminate both problems associated with the ATR and TA methods, a reflection-absorption mode has also been proposed to detect organic compounds in aqueous solutions. 22,23 In this method, hollow waveguide samplers are prepared by coating hydrophobic film on the inner surface of hollow IR waveguides. After the aqueous solution passes through this coated waveguide, the organic compounds can be trapped into the SPME layer. The absorbed organic compounds were further sensed by infrared radiation based on the principle of multireflection-absorption. However, the complex production procedures in the formation of a hollow waveguides sampler restricted the spreading of this technique. To further simplify a reflection absorption type of method, a single-reflection method combined with the principle o...

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“…Mn(III,IV) oxides (Mn oxides) and soluble Mn(III) complexes are the strongest oxidizing agents in the environment after oxygen and play an important role in many biogeochemical cycles (25). At pH 7, they can oxidize metals, catalyze the formation of humic substances and organic nitrogen complexes, and oxidatively degrade humic and fulvic acids to bioavailable low-molecular-weight organic compounds (6,38,40).…”

mentioning

confidence: 99%

Mn(II) Oxidation Is Catalyzed by Heme Peroxidases in “ Aurantimonas manganoxydans ” Strain SI85-9A1 and Erythrobacter sp. Strain SD-21

Anderson

Johnson

Caputo

et al. 2009

Appl Environ Microbiol

119

128

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A new type of manganese-oxidizing enzyme has been identified in two alphaproteobacteria, "Aurantimonas manganoxydans" strain SI85-9A1 and Erythrobacter sp. strain SD-21. These proteins were identified by tandem mass spectrometry of manganese-oxidizing bands visualized by native polyacrylamide gel electrophoresis in-gel activity assays and fast protein liquid chromatography-purified proteins. Proteins of both alphaproteobacteria contain animal heme peroxidase and hemolysin-type calcium binding domains, with the 350-kDa active Mn-oxidizing protein of A. manganoxydans containing stainable heme. The addition of both Ca 2؉ ions and H 2 O 2 to the enriched protein from Aurantimonas increased manganese oxidation activity 5.9-fold, and the highest activity recorded was 700 M min ؊1 mg ؊1 . Mn(II) is oxidized to Mn(IV) via an Mn(III) intermediate, which is consistent with known manganese peroxidase activity in fungi. The Mn-oxidizing protein in Erythrobacter sp. strain SD-21 is 225 kDa and contains only one peroxidase domain with strong homology to the first 2,000 amino acids of the peroxidase protein from A. manganoxydans. The heme peroxidase has tentatively been named MopA (manganese-oxidizing peroxidase) and sheds new light on the molecular mechanism of Mn oxidation in prokaryotes.

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Oxidation of aniline and other primary aromatic amines by manganese dioxide

Abstract: Financial support from EROS-2000 Project is gratefully acknowledged. We thank J. I. Gomez-Belinchon, R. Llop, and M. Vails for technical assistance.

Cited by 314 publications

References 18 publications

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Development of a Solid-Phase Microextraction/Reflection-Absorption Infrared Spectroscopic Method for the Detection of Chlorinated Aromatic Amines in Aqueous Solutions

Mn(II) Oxidation Is Catalyzed by Heme Peroxidases in “ Aurantimonas manganoxydans ” Strain SI85-9A1 and Erythrobacter sp. Strain SD-21

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