Azo-dye Orange II degradation by heterogeneous Fenton-like reaction using carbon-Fe catalysts

Ramírez, Jorge H; Maldonado-Hódar, Francisco J.; Pérez-Cadenas, Agustı́n F.; Moreno‐Castilla, Carlos; Costa, Carlos A. V.; Madeira, Luís M.

doi:10.1016/j.apcatb.2007.05.003

Cited by 502 publications

(237 citation statements)

References 43 publications

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“…As shown in Figure 3, the oxidation reaction accelerates as a function of the temperature as expected due to the exponential dependency of the kinetic constants with the temperature (Arrhenius law). [30] The increase of temperature promotes the generation of radicals and the subsequent attack to the dye molecules. [31] It can be found that complete dye degradation can be obtained at 30, 45 and 60 o C after 140 min.…”

Section: Resultsmentioning

confidence: 99%

Modular Polyoxometalate‐Layered Double Hydroxide Composites as Efficient Oxidative Catalysts

Chen

Yao

Miras

et al. 2015

Chemistry A European J

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Abstract:The exploitation of intercalation techniques in the field of two-dimensional layered materials offers unique opportunities for controlling chemical reactions in confined spaces and developing nanocomposites with desired functionality. In this paper, we demonstrate the exploitation of the novel and facile 'one-pot' anionexchange method for the functionalization of layered double hydroxides (LDHs). As a proof of concept, we demonstrate the intercalation of a series of polyoxometalate (POM) clusters, Na3[PW12O40]·15H2O (Na3PW12), K6[P2W18O62]·14H2O (K6P2W18), and Na9LaW10O36·32H2O (Na9LaW10) into tris(hydroxymethyl)aminomethane (Tris) modified layered double hydroxides (LDHs) under ambient conditions without the necessity of degassing CO2. Investigation of the resultant intercalated materials of Tris-LDHs-PW12 (1), Tris-LDH-P2W18 (2), and Tris-LDH-LaW10 (3) for the degradation of methylene blue (MB), rhodamine B (RB) and crystal violet (CV) has been carried out, where Tris-LDH-PW12 reveals the best performance in the presence of H2O2. Additionally, degradation of a mixture of RB, MB and CV by Tris-LDH-PW12 follows the order of CV > MB > RB, which is directly related to the designed accessible area of the interlayer space. Also, the composite can be readily recycled and reused at least ten cycles without measurable decrease of activity.

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Section: Resultsmentioning

confidence: 99%

Modular Polyoxometalate‐Layered Double Hydroxide Composites as Efficient Oxidative Catalysts

Chen

Yao

Miras

et al. 2015

Chemistry A European J

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“…In fact, this parameter was found to be the most influential one in the process, since for low values of temperature (10 °C) color conversion was below 10%, while mineralization was only 6%. These low efficiencies at 10 ºC and increased performances for temperatures between 50-70 ºC were reported in other studies that address the heterogeneous Fenton oxidation for removal of dyes and other pollutants [5,8,10,14,52].…”

Section: Influence Of the Reaction Temperaturementioning

confidence: 90%

“…This removal requires the inclusion of another stage in the treatment process, thus making it more expensive and complex [7]. To minimize these disadvantages, different forms to attach the iron species to a porous solid matrix (such as a zeolite, clay or activated carbon support) were studied -socalled heterogeneous Fenton-like process [5,8,[9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Fenton’s oxidation using Fe/ZSM-5 as catalyst in a continuous stirred tank reactor

Queirós

Morais

Rodrigues

et al. 2015

Separation and Purification Technology

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This work is the first known report dealing with the heterogeneous Fenton-like process in a continuous stirred tank reactor. A Fe/ZSM-5 zeolite was used as catalyst for degradation of an azo dye (Orange II, OII)-containing solution.A parametric study was carried out to evaluate the effect of the main operating conditions in the basket reactor performance, namely temperature (in the range 10 - [H2O2]feed = 6 mM, W/Q = 200 mg.min/mL, dp2 and tresid = 90 min), it was achieved 91% of discoloration and 36% of mineralization, at steady-state. Moreover, it was found a removal of 29% in terms of the chemical oxygen demand (COD), being worth noting the improvement in the effluent biodegradability (k' -oxygen uptake rate -increased from 9.3 to 23.2 mgO2/(gVSS.h)) and the fact that the final effluent is non-toxic (0.0% of Vibrio fischeri inhibition).The stability of the catalyst performance was checked during five consecutive runs. The crucial factor for the catalyst long-term use is the leaching of iron, which in all runs reached very low levels (e.g. only 0.173 mg/L of iron for the run in the optimized conditions, corresponding to only 0.13% of leaching). The catalyst was characterized by different techniques before and after the reactions (namely SEM/EDS and N2 adsorption); textural and chemical transformations during its use can be considered negligible (except for very acidic conditions of pH = 1.5) favoring the catalytic stability of the Fe-zeolite.

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“…For Cr-M containing system, its initial rate was lower than that in the system with M, but the average rate in 1-12 h was 2.82 g L −1 min −1 , which was higher than the other systems except that with Ti-M. From the above observations, the UV/Fenton catalytic system with faster • OH generation (e.g., M, Co-M and Ni-M), had lower efficiency in TBBPA degradation, which was probably ascribed to the fact that the excessive • OH generated in a short time would be quenched by H 2 O 2 to form weaker oxidative perhydroxyl radicals (HO 2 • ) as expressed in Eq. (3) [35,36], leading to less effective degradation.…”

Section: • Oh Formation In Heterogeneous Uv/fenton Systemmentioning

confidence: 99%

The constraints of transition metal substitutions (Ti, Cr, Mn, Co and Ni) in magnetite on its catalytic activity in heterogeneous Fenton and UV/Fenton reaction: From the perspective of hydroxyl radical generation

Zhong

Liang

Zhu

et al. 2014

Applied Catalysis B: Environmental

145

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Azo-dye Orange II degradation by heterogeneous Fenton-like reaction using carbon-Fe catalysts

Cited by 502 publications

References 43 publications

Modular Polyoxometalate‐Layered Double Hydroxide Composites as Efficient Oxidative Catalysts

Modular Polyoxometalate‐Layered Double Hydroxide Composites as Efficient Oxidative Catalysts

Heterogeneous Fenton’s oxidation using Fe/ZSM-5 as catalyst in a continuous stirred tank reactor

The constraints of transition metal substitutions (Ti, Cr, Mn, Co and Ni) in magnetite on its catalytic activity in heterogeneous Fenton and UV/Fenton reaction: From the perspective of hydroxyl radical generation

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