Heterogeneous catalytic ozonation of benzothiazole aqueous solution promoted by volcanic sand

Váldes, Héctor; Murillo, F.A.; Manoli, J.; Zaror, Claudio A.

doi:10.1016/j.jhazmat.2007.09.057

Cited by 61 publications

(41 citation statements)

References 28 publications

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“…All the HA ozonation experiments were performed when the ozone achieved equilibrium at the operating conditions. In this study, the contribution of both heterogeneous reactions taking place on the bone charcoal surface and homogeneous reactions by ozone and radicals present in the liquid bulk can be formulated as follows [9,[26][27][28]:…”

Section: Resultsmentioning

confidence: 99%

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Degradation of humic acids through heterogeneous catalytic ozonation with bone charcoal

Mortazavi

Asgari

Hashemian

et al. 2010

Reac Kinet Mech Cat

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Catalytic ozonation has recently been used as a new means of contaminant removal from water and wastewater. In this study, bone charcoal (BC), a new catalyst prepared under laboratory conditions, was used to catalyze the ozonation of humic substances (HS) in aqueous solutions. The catalytic effect of bone charcoal and the relevant parameters of this ozonation process (solution pH, temperature, scavenger effect, humic acids concentration and BC dosage) were investigated. In the catalytic ozonation experiments, the degradation kinetics was investigated. The reaction rate and the rate constant were determined. The results showed that using a BC catalyst in the ozonation of HS produced a 1.43-and 1.56-fold increase in reaction rates compared to the sole ozonation processes (SOP) under acidic and alkaline conditions, respectively. Furthermore, the applicability of heterogeneous catalytic ozonation with bone charcoal (HCOBC) to humic acid degradation was evaluated by performing comparisons with H 2 O 2 , O 3 , O 3 /H 2 O 2 and O 3 /H 2 O 2 /BC processes. With the use of the Arrhenius equation, the activation energy (E a ) was calculated to be 10 kJ mol -1 . The results also showed that under the different temperatures, the reaction of the catalytic ozonation of HS was defined as diffusion controlled in accordance with the activation energy. These findings suggest that the HCOBC can be applied as an efficient and feasible method for the removal of HS from water.

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Section: Resultsmentioning

confidence: 99%

“…Molecular ozone, due to its resonance structures, has strong affinity to catalytically active sites on metal oxides; however, it might have different reactivity toward those active sites on metal oxides [2,9,28]. Therefore, ozone's ability to react with both the acidic and basic surface sites of the catalysts is a consequence of its structure.…”

Section: Resultsmentioning

confidence: 99%

Degradation of humic acids through heterogeneous catalytic ozonation with bone charcoal

Mortazavi

Asgari

Hashemian

et al. 2010

Reac Kinet Mech Cat

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“…Increase in the pH of the solution can accelerate the ozone mass transfer and also ozone decomposition rate through heterogeneous (catalytic) reaction. These reactions caused the formation of highly active radicals (HO• radical and others including OH, HO 2 and HO 3 ) and therefore can enhance the degradation rate of various pollutants (47,48).…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Application of Heterogeneous Catalytic Ozonation Process with Magnesium Oxide Nanoparticles for Toluene Degradation in Aqueous Environments

et al. 2016

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Background: Volatile organic compounds (VOCs) removal like toluene is an important concern for health of humans and the environment. Objectives:In this study, the efficiency of heterogeneous catalytic ozonation process (COP) with MgO nanoparticles for toluene degradation in aqueous solutions was investigated. Materials and Methods:Response surface methodology (RSM) using central composite design (CCD) was applied to study the interactions between critical operating factors and to find their optimum levels. Four independent factors namely pH, catalyst dosage, ozonation time and concentration of toluene were transformed to coded values and consequently a second order quadratic model was prepared for responses prediction. Results:The analysis of variance (ANOVA) of the toluene degradation by COP/MgO nanoparticles showed F-value of 19.53 for the quadratic model indicating that the prepared model is significant. The predicted result showed that maximum degradation of toluene (~99.99%) could be achieved at pH 12, MgO dose 0.5 g, ozonation time of 50 minutes and initial toluene concentration of 10 mg/l. The correlation coefficient (R 2 = 0.9480) indicates a good correlation between the experimental and predicted values. Conclusions:According to the results, COP is an efficient and rapid method for removing of toluene from aqueous solutions.

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“…Correspondingly, these xenobiotic compounds are widely distributed in the environment and they have been detected in industrial wastewaters, as well as in soils, estuarine sediments, and superficial waters (Valdés & Zahor, 2006). They cause environmental concern when released into watercourses (Valdés et al, 2008). These compounds inhibit micro-organisms' activity in conventional biological wastewater treatment systems and most of them are not readily biodegradable (de Wewer & Verachter, 1997;de Wewer, 2007).…”

Section: Introductionmentioning

confidence: 99%

Removal of Selected Benzothiazols with Ozone

Derco¹,

Melicher²,

Kassai³

2012

Municipal and Industrial Waste Disposal

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Heterogeneous catalytic ozonation of benzothiazole aqueous solution promoted by volcanic sand

Cited by 61 publications

References 28 publications

Degradation of humic acids through heterogeneous catalytic ozonation with bone charcoal

Degradation of humic acids through heterogeneous catalytic ozonation with bone charcoal

Application of Heterogeneous Catalytic Ozonation Process with Magnesium Oxide Nanoparticles for Toluene Degradation in Aqueous Environments

Removal of Selected Benzothiazols with Ozone

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