Decolorization of C.I. Reactive Red 2 by catalytic ozonation processes

Wu, Chung‐Hsin; Kuo, Chao‐Yin; Chang, Chung‐Liang

doi:10.1016/j.jhazmat.2007.09.058

Cited by 56 publications

(26 citation statements)

References 46 publications

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“…Hence, it can be concluded that ozonation was more effective in decolorization than in mineralization. Our results and those published in a similar study [13] imply that the N --N bonds are more easily ruptured than aromatic structures by ozone.…”

Section: Effect Of Ph On Ozonation Of Rr194supporting

confidence: 87%

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A Comparative Study of Ozonation, Homogeneous Catalytic Ozonation, and Photocatalytic Ozonation for C.I. Reactive Red 194 Azo Dye Degradation

YILDIRIM

Gül

Eren

et al. 2011

CLEAN Soil Air Water

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In this study, the decolorization, dearomatization, and mineralization efficiencies of different advanced oxidation processes (AOPs; namely O 3 , O 3 /Fe(II), O 3 /Fe(II)/UVA, and O 3 /TiO 2 /UVA) were investigated for the azo dye C.I. Reactive Red 194 (RR194). The effects of pH (3-11), amount of TiO 2 (0.05-1 g/L), and concentration of Fe(II) (0.1-1.6 mM) were investigated for the applied methods. The decolorization and mineralization efficiencies of the photocatalytic ozonation system (O 3 /TiO 2 /UVA) were increased by decreasing the pH of the dye solution in contrast to the ozonation system (O 3 ). Decolorization of RR194 was increased in the photocatalytic ozonation system with an increasing amount of catalyst however, a decreasing was occurred for the homogeneous catalytic system (O 3 /Fe(II)) when increasing the concentration of catalyst. The decolorization efficiency of the homogeneous catalytic system (O 3 /Fe(II)) was enhanced when combined with UVA light. In our study, the most efficient method for dearomatization and mineralization was the O 3 /TiO 2 /UVA among the applied AOPs.

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Section: Effect Of Ph On Ozonation Of Rr194supporting

confidence: 87%

“…In the ozonation process, ozone rapidly decomposes to yield hydroxyl radicals in a basic solution according to Eqs. (1)-(3) below [13]:…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Ozonation, Homogeneous Catalytic Ozonation, and Photocatalytic Ozonation for C.I. Reactive Red 194 Azo Dye Degradation

YILDIRIM

Gül

Eren

et al. 2011

CLEAN Soil Air Water

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“…In fact, the formed radicals in the solution under these conditions initiated toluene oxidation (as indirect) with greater rates than those obtained with SOP (15,24). Similar mechanisms were reported by other researchers for organic compounds degradation (27, 54).…”

Section: Effect Of Solution Phsupporting

confidence: 86%

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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“…Although these methods yield significant color removal (CR), they are unable to ensure that the treated effluent meets the discharge criteria of wastewater in terms of COD. These methods also generate solid wastes that require further handling, as they only transform pollutants from one phase to another but do not degrade them (Wu et al 2008a, Punzi et al 2012, Babuponnusami and Muthukumar 2013. In addition, adsorbent regeneration, excess sludge production, and rapid fouling of the used membranes are some of the other disadvantages of conventional treatment processes.…”

Section: Characterization Of Textile Wastewatersmentioning

confidence: 99%

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Buthiyappan

Raman

Daud

2016

Reviews in Chemical Engineering

242

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AbstractIn the past few years, there have been many researches on the use of different types of homogenous catalyst for the degradation of textile wastewater in conventional advanced oxidation processes (AOPs). However, homogenous AOPs suffer from few limitations, including large consumption of chemicals, acidic pH, high cost of hydrogen peroxide, generation of iron sludge, and necessity of post-treatment. Therefore, recently, there have been more researches that focus on improving the performance of conventional AOPs using heterogeneous catalysts such as titanium dioxide, nanomaterials, metal oxides, zeolite, hematite, goethite, magnetite, and activated carbon (AC). Besides, different supports such as AC that have been incorporated with transition metals and clays have been proven to have excellent catalytic activity in AOPs. This paper presents a comprehensive review of advances and prospects of catalytic AOPs for the decontamination of a wide range of synthetic and real textile wastewater. This review provides an up-to-date critical review of the information on the degradation of various textile dyes by a wide range of heterogeneous catalysts and adsorbents. The future challenges of AOPs, including chemical consumption, toxicity assessment, reactor design, and limitation of catalysts, are discussed in this paper. In addition, this paper also discusses the presence of ions, generation of by-products, and industrial applications of AOPs. Special emphasis is given to recent studies and large-scale combination of AOPs for wastewater treatment. This review paper concludes that more studies are needed for the kinetics, reactor design, and modeling of hybrid AOPs and the production of their corresponding intermediate products and secondary pollutants. A better economic model should also be developed to predict the cost of AOPs, as the treatment cost varies with dyes and textile effluents.

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Decolorization of C.I. Reactive Red 2 by catalytic ozonation processes

Cited by 56 publications

References 46 publications

A Comparative Study of Ozonation, Homogeneous Catalytic Ozonation, and Photocatalytic Ozonation for C.I. Reactive Red 194 Azo Dye Degradation

A Comparative Study of Ozonation, Homogeneous Catalytic Ozonation, and Photocatalytic Ozonation for C.I. Reactive Red 194 Azo Dye Degradation

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

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

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