Catalytic detoxification of 1,1-dimethylhydrazine aqueous solutions in heterogeneous Fenton system

Makhotkina, Olga; Kuznetсova, E. V.; Preis, Sergei

doi:10.1016/j.apcatb.2006.07.008

Cited by 66 publications

(29 citation statements)

References 13 publications

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“…The UDMH concentration was determined using the absorption band of the formaldehyde hydrazone (e = 5000 M À1 cm À1 at k = 235 nm), the product of the reaction between UDMH and formaldehyde [10]. The NDMA and H 2 O 2 concentrations were determined using the absorption band of these substances in the UV range ((e = 90 M À1 cm À1 at k = 330 nm) and (e = 21,000 M À1 cm À1 at k = 551 nm), respectively).…”

Section: Discussionmentioning

confidence: 99%

“…The main disadvantage of these methods is formation of NDMA as an intermediate of UDMH oxidation [8]. Advanced oxidation processes (AOPs), such as photocatalysis, Fenton, photo-Fenton, and UV/H 2 O 2 have been investigated and reported by some researchers as efficient methods for degradation of UDMH, and minimizing the formation of NDMA [9][10][11]. However, the continuous need for an oxidizing agent (hydrogen peroxide, ozone, etc.)…”

Section: Introductionmentioning

confidence: 98%

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Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Angaji

Ghiaee

2015

Ultrasonics Sonochemistry

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A pilot scale hydrodynamic cavitation (HC) reactor, using iron metal blades, as the heterogeneous catalyst, with no external source of H₂O₂ was developed for catalytic decontamination of unsymmetrical dimethylhydrazine (UDMH) waste water. In situ generation of Fenton reagents suggested an induced advanced Fenton process (IAFP) to explain the enhancing effect of the used catalyst in the HC process. The effects of the applied catalyst, pH of the initial solution (1.0-9.7), initial UDMH concentration (2-15 mg/l), inlet pressure (5.5-7.8bar), and downstream pressure (2-6 bar), have been investigated. The results showed that the highest cavitation yield can be obtained at pH 3 and initial UDMH concentration of 10mg/l. Also, an increase in the inlet pressure would lead to an increase in the extent of UDMH degradation. In addition, the optimum value of 3 bar was determined for the downstream pressure that resulted to 98.6% degradation of UDMH after 120 min of processing time. Neither n-nitrosodimethylamine (NDMA) nor any other toxic byproduct (/end-product) was observed in the investigated samples. Formic acid and acetic acid, as well as nitromethane, were identified as oxidation by-products. The present work has conclusively established that hydrodynamic cavitation in combination with Fenton's chemistry can be effectively used for the degradation of UDMH.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Angaji

Ghiaee

2015

Ultrasonics Sonochemistry

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“…However, despite the high efficiency, the process is limited by the acidic pH required (pH 2-4) and the high amount of sludge generated in the coagulation step for the elimination of the iron added and which makes the process laborious and not economical [10]. The catalytic degradation of organic contaminants using Fenton system can become more efficient when is carried out in a heterogeneous way, such as zeolites or clays loaded with the iron [11][12][13]. Among them, the use of synthetic zeolites is very promising due to their unique properties [14,15] and their ability to adsorb small organic molecules [16,17].…”

Section: Introductionmentioning

confidence: 99%

Rapid decolourization and mineralization of the azo dye C.I. Acid Red 14 by heterogeneous Fenton reaction

Idel-aouad

Valiente

Yaacoubi

et al. 2011

Journal of Hazardous Materials

120

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“…The general view of the kinetic Eqs. (5)(6) corresponds to the typical mass action law form with strong inhibition by phenol and its oxidation intermediates, as well as with moderate inhibition by hydrogen peroxide. The optimal values of kinetic parameters for the model (5-6) are given in Table 3.…”

Section: Mathematical Modeling Of Peroxide Oxidation Processes Proceementioning

confidence: 99%

“…The most stable and active WPO catalysts are zeolite-based materials containing transition metals [4][5][6][7]. The most attention was paid in literature to Fe-containing zeolites with the MFI structure [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Cu and Fe-containing ZSM-5 zeolites as catalysts for wet peroxide oxidation of organic contaminants: reaction kinetics

et al. 2015

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The peroxide oxidation of model substrates (formic acid and phenol) was studied in the presence of copper-and iron-containing catalysts (0.5 % Cu-ZSM-5-30 and 0.65 % Fe-ZSM-5-30). The aim was to develop optimal kinetic models for describing the kinetics of peroxide oxidation. The real kinetics of phenol and formic acid oxidation in the presence of these catalysts at varied reaction parameters (concentrations and temperature) was studied. The copper-containing catalysts were more active to formic acid oxidation than the iron-containing catalyst over all the temperature range studied. The rate of destruction of pollutants decreases with a decrease in the H 2 O 2 concentration and the catalyst weight. The observed rate dependences on the initial substrate concentration appeared to be different for the substrate used. With formic acid, an increase of initial concentration leads to a slight increase in the reaction rate. In the case of phenol peroxide oxidation, the negative order with respect to the substrate concentration was observed. This may be explained by strong inhibition of the reaction rates by phenol and intermediates (hydroquinone, catechol, etc.) of its oxidation. The mathematical modeling of the kinetics was performed for various types of kinetic equations that correspond to different hypotheses on the kinetic reaction scheme. The selected & Oxana P. Taran oxanap@catalysis.ru 1 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 5 prosp.kinetic models based on logical kinetic schemes allowed describing the peroxide oxidation of model substrates at an appropriate accuracy.

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Catalytic detoxification of 1,1-dimethylhydrazine aqueous solutions in heterogeneous Fenton system

Cited by 66 publications

References 13 publications

Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Rapid decolourization and mineralization of the azo dye C.I. Acid Red 14 by heterogeneous Fenton reaction

Cu and Fe-containing ZSM-5 zeolites as catalysts for wet peroxide oxidation of organic contaminants: reaction kinetics

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