Intermediates in wet oxidation of cellulose: identification of hydroxyl radical and characterization of hydrogen peroxide

Robert, Raphaël; Barbati, Stéphane; Ricq, Natacha; Ambrosio, M.

doi:10.1016/s0043-1354(02)00205-1

Cited by 83 publications

(33 citation statements)

References 24 publications

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“…The Cu-loaded, Ce-loaded and (Cu,Ce)-loaded catalysts were prepared by loading metal ion on the molecular sieve using 0.1 mol·L −1 Cu(NO 3 ) 2 and Ce(NO 3 ) 3 solution. The prepared solids were washed withde-ionized water for three times, then it was dried at 120 • C overnight and calcined at 450 • C for 4 h. The X-ray diffraction (XRD) analysis of the prepared catalysts was performed.…”

Section: Synthesis Of Catalystmentioning

confidence: 99%

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Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

2018

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Abstract:In the present study, the catalytic wet oxidation of pharmaceutical sludge by molecular sieve loaded with Cu/Ce as catalyst was investigated. Experiments were performed in an experimental batch reactor. Reaction parameters including catalyst dose, temperature, time, and oxygen pressure were discussed. The results showed that the catalysts prepared by co-precipitating method have good catalytic performance. Under optimum conditions, the highest volatile suspended solids (VSS) removal rate approximately 92% and chemical oxygen demand (COD) removal rate of 75% were obtained at 260 • C for 60 min with initial oxygen pressure 1.0 MPa and the catalyst 10 g/L. These results implied that the catalytic wet oxidation of pharmaceutical sludge by molecular sieve loaded with Cu/Ce is a promising method for the highly efficient degradation of the sludge.

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Section: Synthesis Of Catalystmentioning

confidence: 99%

“…Subsequent oxidative reactions convert these hydrolysis products into increasingly simpler organics such as organic acids and alcohols. Finally, these products can be further oxidized [2]. Organic acids (mainly acetic acid) are the major intermediate products of sludge [3].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

2018

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“…H 2 O 2 was analyzed by UV-Vis spectrophotometer (U-3900H) based on the formation of red-orange color peroxovanadium cation after the reaction of H 2 O 2 with NH 4 VO 3 in acidic medium (Nogueira et al, 2005). According to the method of Robert et al (2002), HO • was detected by electron spin resonance spectroscopy (ESR, Bruker Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

Zhou

Zhang

et al. 2014

Applied Clay Science

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Al-Fe-, Al-Cu-, and Al-Fe-Cu-PILCs were synthesized, characterized and tested in the catalytic wet peroxide oxidation of 4-chlorophenol (4-CP). An apparent induction period followed by a rapid oxidation was observed during the Fenton-like reaction, and the whole reaction could be modeled well using a Fermi's kinetic equation (R 2 = 0.9938~0.9993). The generation of hydroxyl radicals (HO • ) from surface-catalyzed decomposition of H 2 O 2 was the oxidation cause whereas the dissolution of active metals was its result. Accordingly, induction period was the cause of heterogeneous surface activation (catalysis or modification) for more HO • formed by decreasing pH. 4-CP oxidation proceeded via 4-chlorocatechol (major) and hydroquinone (minor) pathways, along the formation of main intermediate (5-chloro-1,2,4-benzentriol). Finally besides CO 2 , H 2 O and Cl − two main compounds (I and II) formed, where the former was identified as 2,4-dioxopentanedioic acid whereas the latter as ferric-oxalate complex. There were marked structural and active differences between Al-Fe-PILC and Al-Cu-PILC in which compared to the latter, the former possessed higher SSA and activity but its optimal calcination temperature was lower and the induction time was also longer. In addition, compound II accounted for a considerable proportion in Al-Fe-PILC system whereas compound I was almost only component in Al-Cu-PILC system.

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“…Some examples of the different types of free-radical chemical reactions that can occur are showed by Eqs. 1-26 (Mantzavinos et al, 1997;Ingale et al, 1996;Robert et al, 2002;Rivas et al, 1998;Emanuel et al, 1980;Wakabayashi & Okuwaki, 1988;Eyer, 2001;Li et al, 1991;Farhataziz & Ross, 1977;Patterson et al, 2001;Glaze et al, 1995;Ichinose, S.;Okuwaki, 1990 ): …”

Section: Free-radical and Non-free-radical Reactions Of Wo Processmentioning

confidence: 99%

Status and Prospects of Concentrated Organic Wastewater Degradation

Liu¹,

DuShu²,

Yi³

et al. 2012

Industrial Waste

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Intermediates in wet oxidation of cellulose: identification of hydroxyl radical and characterization of hydrogen peroxide

Cited by 83 publications

References 24 publications

Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

Status and Prospects of Concentrated Organic Wastewater Degradation

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