Heterogeneous UV-Fenton catalytic degradation of dyestuff in water with hydroxyl-Fe pillared bentonite

Chen, Jianxin; Zhu, Lizhong

doi:10.1016/j.cattod.2007.06.022

Cited by 167 publications

(69 citation statements)

References 35 publications

(57 reference statements)

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“…It was calculated that the activation energy was 27.9 kJ/mol for the degradation process of Orange II by the ribbons over the temperature range of 25-50°C. Considering the fact that the activation energies for ordinary thermal reactions are usually between 60 and 250 kJ/mol [12], our result implies that the degradation of Orange II by the ribbons required a relatively low energy.…”

Section: Resultsmentioning

confidence: 78%

Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

et al. 2011

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An Fe-based amorphous alloy was found to significantly enhance the reductive degradation of an azo dye in aqueous solution. The surface-area normalized rate constant was up to 2.0 L m 2 min 1 at room temperature, an order of magnitude larger than any previously reported value. The activation energy of the degradation process was calculated according to the Arrhenius equation, and a much lower value than those previously reported was obtained. Valence band measurement indicated that a depressed valence band maximum and a widened empty band were established in the amorphous ribbon. The unique structure of the amorphous alloy is important -it may reduce the activation energy of the degradation process and enhance the activity of the electrons, thus accelerating the degradation process.amorphous alloys, azo dyes, UV-visible spectrophotometer, degradation, activation energy Citation: Zhang C Q, Zhu Z W, Zhang H F, et al. Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys.

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Section: Resultsmentioning

confidence: 78%

Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

et al. 2011

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“…The apparent activation energy E = 23.95 kJ/mol was obtained from the slope of the plot, and the pre-exponential factor A = 170.80/min was obtained from the y-intercept. Typical thermal reactions usually have reaction activation energies between 60 and 250 kJ/mol [23]. The apparent activation energy in this study implied that the degradation of SMMS in aqueous solution by the photo-Fenton oxidation process required much lower activation energy and could be easily achieved.…”

Section: Kinetic Studymentioning

confidence: 72%

“…In recent years, advanced oxidation processes (AOPs) have been identified as an attractive option for wastewater treatment, particularly in the case of contaminants that are difficult to remove or eliminate by conventional biological or physicochemical technologies [20][21][22][23]. AOPs are based on the generation of highly reactive and nonselective oxidant hydroxyl radicals (OH), which can oxidize a broad range of organic pollutants to CO 2 and H 2 O.…”

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confidence: 99%

Degradation of the antibiotic sulfamonomethoxine sodium in aqueous solution by photo-Fenton oxidation

et al. 2012

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In this study, photo-Fenton oxidation was applied to degradation of sulfamonomethoxine sodium (SMMS) in aqueous solution. The operation parameters of pH, temperature, and concentrations of H 2 O 2 , Fe 2+ and SMMS were investigated. The optimum conditions for the photo-Fenton process were determined as follows:.51 mol/L and T=25°C. Under these conditions 98.5% of the SMMS degraded. The kinetics were also studied, and degradation of SMMS by the photo-Fenton process could be described by first-order kinetics. The apparent activation energy was calculated as 23.95 kJ/mol. Mineralization of the process was investigated by measuring the chemical oxygen demand (COD), and the COD decreased by 99% after 120 min. This process could be used as a pretreatment method for wastewater containing sulfamonomethoxine sodium.sulfamonomethoxine sodium, degradation, photo-Fenton

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“…Kapdan and Oztekin (2005) reached 95% color removal, in an aerobic-anaerobic-SBR, but all decolorization was achieved in the anaerobic phase. Despite the high color removal, the anaerobic degradation of azo-dyes can produce potentially carcinogenic amines (Chen and Zhu, 2007). To avoid this problem, feed, settling, decant, and inactivation phases were kept at a minimum (30 min) and photocatalysis with TiO 2 /UV was used to remove color.…”

Section: Sequencing Batch Reactormentioning

confidence: 99%

COMBINING A SEQUENCING BATCH REACTOR WITH HETEROGENEOUS PHOTOCATALYSIS (TiO2/UV) FOR TREATING A PENCIL MANUFACTURER'S WASTEWATER

Padovan

Azevedo

2015

Braz. J. Chem. Eng.

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-A Sequencing Batch Reactor (SBR) was combined with heterogeneous photocatalysis (TiO 2 /UV) as a tertiary treatment for a pencil manufacturer's wastewater. The SBR removed almost all Chemical Oxygen Demand (COD) from the wastewater, although color was barely removed. Photocatalysis was optimized using a factorial design. Final COD, Dissolved Organic Carbon (DOC), and color removals were 95%, 80%, and 93%, respectively. Treated wastewater showed no ecotoxicity towards Lactuca sativa. Color removal kinetics (photocatalysis) followed a pseudo-first order model. The SBR + AOP (Advanced Oxidation Process, TiO 2 /UV) combination was a feasibility choice for removing both COD and color from this wastewater.

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Heterogeneous UV-Fenton catalytic degradation of dyestuff in water with hydroxyl-Fe pillared bentonite

Cited by 167 publications

References 35 publications

Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

Degradation of the antibiotic sulfamonomethoxine sodium in aqueous solution by photo-Fenton oxidation

COMBINING A SEQUENCING BATCH REACTOR WITH HETEROGENEOUS PHOTOCATALYSIS (TiO2/UV) FOR TREATING A PENCIL MANUFACTURER'S WASTEWATER

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