Catalytic wet peroxide oxidation of phenol over Fe-exchanged pillared beidellite

Catrinescu, Cezar; Teodosiu, Carmen; Macoveanu, Matei; Miehé-Brendlé, Jocelyne; Dred, Ronan Le

doi:10.1016/s0043-1354(02)00449-9

Cited by 191 publications

(110 citation statements)

References 21 publications

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“…These catalysts were called as used catalyst and used catalyst washed with ethanol, respectively. The latter one was calcined by heating to 423 K and keeping there for 15 min then heating to 873 K and keeping at this temperature for 2 h to remove the adsorbed organic species from the active sites [4,28]. The activities of these catalysts in R6G decolorization and degradation were presented in Fig.…”

Section: Stability and Recycling Of The Catalystmentioning

confidence: 99%

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

Dükkancı

Gündüz

Yılmaz

et al. 2010

Journal of Hazardous Materials

166

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a b s t r a c tIn this study, heterogeneous Fenton-like degradation of reactive azo dye Rhodamine 6G in water was investigated over a CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis. At initial pH of 3.4, a color removal of 100% was achieved after a reaction time of 45 min. TOC elimination was measured to be 51.8% after 2 h of oxidation. Initial decolorization rate was described by an equation of −r A0 = 4.56 × 10 2 e −24.83/RT C R6G,0 C 0.35 H 2 O 2 ,0 where R is in kJ/mol. The leaching of iron and copper cations from zeolite structure into the solution during oxidation was dependent on pH strongly. The regulation of pH from 6.5 (dye solution pH) to 3.4, increased leaching for iron from 0.7 to 0.8 mg/dm 3 and for copper from 1.4 to 2.1 mg/dm 3 . The copper was totally leached from the catalyst during the process at pH 3.4.

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Section: Stability and Recycling Of The Catalystmentioning

confidence: 99%

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

Dükkancı

Gündüz

Yılmaz

et al. 2010

Journal of Hazardous Materials

166

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show abstract

“…In view of the growing concern of environmental issues, alternative techniques must be found to meet the problem. Adsorption process and catalytic oxidation technologies are promising methods for the removal of various contaminants and have been studied for the removal of organic refractory pollutants from water [3,4].…”

Section: Introductionmentioning

confidence: 99%

Removal of azo-dye Acid Red B (ARB) by adsorption and catalytic combustion using magnetic CuFe2O4 powder

et al. 2004

Applied Catalysis B: Environmental

151

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The effectiveness of magnetic CuFe 2 O 4 powder as adsorbent/catalyst for the removal of azo-dye Acid Red B (ARB) from water by adsorption and subsequent catalytic combustion was studied. Magnetic CuFe 2 O 4 powder showed excellent adsorption properties towards ARB at pH < 5.5, and it could be conveniently recovered by magnetic separation technology after adsorption. The combustion decomposition of ARB in the presence or absence of CuFe 2 O 4 was studied by a system for thermal degradation studies (STDS) and in situ FTIR. The results indicated that different reactive pathways existed for the combustion under different conditions. In the presence of CuFe 2 O 4 , the temperature needed for oxidation reaction and for combustion was 150 and 300 • C, respectively. The reaction products were observed to be SO 2 , CO 2 , H 2 O, and nitrate. There was neither volatile organic compound (VOCs) emitted to atmosphere during reaction nor organic matter deposited on the surface of CuFe 2 O 4 after the combustion. Comparatively, in the absence of CuFe 2 O 4 , the oxidation and combustion of ARB required a higher temperature (300 and 500 • C, respectively) and produced a lot of toxic organic compounds emitted to atmosphere besides SO 2 , CO 2 and H 2 O during the reaction. In addition, sulfate was generated instead of nitrate. The experiments of adsorption-combustion cycles demonstrated that there was no evident change in adsorption properties and catalytic activity of magnetic CuFe 2 O 4 powder after seven cycles.

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“…The phenomenon that the UV-Fenton catalyst could extend the range of pH values for Fenton-type oxidation was also reported using iron-exchanged pillared beidellite [17] and iron-exchanged pillared bentonite [6] as the catalyst. This property should be ascribed to the acid-alkaline buffering capacities of the catalyst caused by Fe-polycations [Fe n (OH) m (H 2 O) x ] (3n−m)+ [6], which were intermediate derivatives between the primary hydrolyzed products and the insoluble FeOOH.…”

Section: Effects Of the Photo-fenton Experimentsmentioning

confidence: 66%

Catalytic oxidation of Methyl Orange by an amorphous FeOOH catalyst developed from a high iron-containing fly ash

Zhang

2010

Chemical Engineering Journal

106

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Catalytic wet peroxide oxidation of phenol over Fe-exchanged pillared beidellite

Cited by 191 publications

References 21 publications

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

Removal of azo-dye Acid Red B (ARB) by adsorption and catalytic combustion using magnetic CuFe2O4 powder

Catalytic oxidation of Methyl Orange by an amorphous FeOOH catalyst developed from a high iron-containing fly ash

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